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Practice 1 Genetic researchers have accelerated a plant’s growth by making its cells split faster—a technique that could someday lead to healthier crops, shorter growing seasons and less use of herbicides. One outside scientist called the findings astonishing. But the technique needs more testing on a range of plants, and public fear of genetically modified food is jeopardizing support for such experiments, especially in Europe, researchers said. The experiment, reported Thursday in the journal Nature, was carried out by a team at Cambridge University. The researchers first took a gene promoting cell division from inside the Arabidopsis plant, a flowering weed often used for genetic experiments. They transplanted that gene into a tobacco plant. There, in an especially potent form, the gene produced large amounts of a protein that, in combination with other chemicals naturally in the tobacco, made the plant’s cells divide more quickly at the tips of roots and shoots. Within a month after planting, the altered tobacco grew as much as twice as tall as other tobacco plants. Ultimately, the other plants caught up, and both groups then appeared identical in all ways. “It’s sort of like they’ve been able to make the plant go full throttle,” a said plant growth biologist John Schiefelbein at the University of Michigan. The leader of the study, Claire Cockcroft, said it is conceivable that the technique could be transferred to other species. Such plants, which probably would take years to develop commercially, might allow an extra planting in some climates or the introduction of crops in places where the growing season is too short, researchers said. The quick-growth plants would presumably take hold more easily, requiring less chemical herbicide to knock out weeds. Such plants might make easier and cheaper sources of some drugs. In scientific circles, the British research may also help settle an intense debate over what makes plants grow. Some argue, like these researchers, that something at the cellular level switches on growth; others look to hormones or other chemicals at a higher level of the plant’s makeup. “This is astonishing. Normally you would expect growth regulation to be more complicated,” said plant researcher Xuemin Wang at Kansas State University. “This has huge implications in terms of how we look at plant growth.” Biotechnology companies have genetically manipulated fruits and vegetables to make them more attractive or resistant to insects and disease. Genetic work has shown some early promise for faster growth, too. But previous attempts to boost growth through faster cell division have produced more cells—but smaller ones—and no overall growth. Scientists said such work is safe, with little chance of accidentally turning an unwanted plant into a fast-growing weed. After all, crops have been selectively bred for decades to bring out certain traits. However, ethicist Jeffrey Burkhardt at the University of Florida’s Institute of Food and Agricultural Sciences said selective breeding takes perhaps 15 years, giving scientists ample time to see the implications. “With the new biotechnology, you’re potentially moving traits in and out within a year,” he said.
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更多 “问答题Practice 1 Genetic researchers have accelerated a plant’s growth by making its cells split faster—a technique that could someday lead to healthier crops, shorter growing seasons and less use of herbicides. One outside scientist called the findings astonishing. But the technique needs more testing on a range of plants, and public fear of genetically modified food is jeopardizing support for such experiments, especially in Europe, researchers said. The experiment, reported Thursday in the journal Nature, was carried out by a team at Cambridge University. The researchers first took a gene promoting cell division from inside the Arabidopsis plant, a flowering weed often used for genetic experiments. They transplanted that gene into a tobacco plant. There, in an especially potent form, the gene produced large amounts of a protein that, in combination with other chemicals naturally in the tobacco, made the plant’s cells divide more quickly at the tips of roots and shoots. Within a month after planting, the altered tobacco grew as much as twice as tall as other tobacco plants. Ultimately, the other plants caught up, and both groups then appeared identical in all ways. “It’s sort of like they’ve been able to make the plant go full throttle,” a said plant growth biologist John Schiefelbein at the University of Michigan. The leader of the study, Claire Cockcroft, said it is conceivable that the technique could be transferred to other species. Such plants, which probably would take years to develop commercially, might allow an extra planting in some climates or the introduction of crops in places where the growing season is too short, researchers said. The quick-growth plants would presumably take hold more easily, requiring less chemical herbicide to knock out weeds. Such plants might make easier and cheaper sources of some drugs. In scientific circles, the British research may also help settle an intense debate over what makes plants grow. Some argue, like these researchers, that something at the cellular level switches on growth; others look to hormones or other chemicals at a higher level of the plant’s makeup. “This is astonishing. Normally you would expect growth regulation to be more complicated,” said plant researcher Xuemin Wang at Kansas State University. “This has huge implications in terms of how we look at plant growth.” Biotechnology companies have genetically manipulated fruits and vegetables to make them more attractive or resistant to insects and disease. Genetic work has shown some early promise for faster growth, too. But previous attempts to boost growth through faster cell division have produced more cells—but smaller ones—and no overall growth. Scientists said such work is safe, with little chance of accidentally turning an unwanted plant into a fast-growing weed. After all, crops have been selectively bred for decades to bring out certain traits. However, ethicist Jeffrey Burkhardt at the University of Florida’s Institute of Food and Agricultural Sciences said selective breeding takes perhaps 15 years, giving scientists ample time to see the implications. “With the new biotechnology, you’re potentially moving traits in and out within a year,” he said.” 相关考题
考题
The text intends to tell us that[A] the change of human height follows a cyclic pattern.[B] human height is becoming even more predictable.[C] Americans have reached their genetic growth limit.[D] the genetic pattern of Americans has altered.
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Why would a clone not be identical to the "master copy"?A、They are totally different persons.B、The clone's cells, for example, would have energy-processing machinery that came from the egg, not from the person who was cloned.C、They have different genetic source.D、The clone’s cells can be productive.
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What about the commission? ().A、 Of course, I’d give you our lowest quotationB、 I’m afraid you have to tell me how large your order is going to beC、 It’s a general practice everywhere else
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It's no good __________ remember grammatical rules. You need to practice what you have learned.A. trying toB. try toC. to try toD. that try t0
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1．I don't have a partner __________volleyball __________．A． to practice;/B． practice; withC． to practice; withD． practice;/
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In which stage of the Presentation-Practice-Production approach will students have the chance to use the new language freely and incorporate it into their existing language?A.Presentation stage
B.Practice stage
C.Production stage
D.Practice stage and Production stage
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The Tough Grass That Sweetens Our LivesSugar cane was once a wild grass that grew in New Guinea and was used by local people for roofing their houses and fencing their gardens. Gradually a different variety evolved which contained sucrose（蔗糖）and was chewed on for its sweet taste. Over time,sugar cane became a highly valuable commercial plant,grownthroughout the world. _________(46)Sugar became a vital ingredient in all kinds of things ,from confectionery（糖果点心）to medicine , and, as the demand for sugar grew ,the industry became larger and more profitable.__________(47)Many crops withered（枯萎）and died,despite growers' attempts to save them ,and there were fears that the health of the plant would continue to deteriorate.In the 1960s ,scientists working in Barbados looked for ways to make the commercial species stronger and more able to resist disease. They experimented with breeding programmes,mixing genes from the wild species of sugar cane,which tends to be tougher, with genes from the more delicate,commercial type. ___________(48)This sugar cane is not yet ready to be sold commercially,but when this happens,it is expected to he incredibly profitable for the industry.____________ (49)Brazil , which produces one quarter of the world's sugar, has coordinated an intema- tional project under Professor Paulo Arrudo of the Universidade Estaudual de Campinas in Sao Paulo. Teams of experts have worked with him to discover more about which parts of the genetic structure of the plant are important for the production of sugar and its overall health.Despite all the research ,however, we still do not fully understand how the genes function in sugar cane.___________(50)This gene is particularly exciting because it makes the plant resistant to rust,a disease which probably originated in India,but is now capable of infecting sugar cane across the world.Scientists believe they will eventually be able to grow a plant which cannot be destroyed by rust.________（49）A:Since the 1960s,scientists have been analysing the mysteries of the sugar cane'S genetic code.B:Unfortunately,however,the plant started to become weaker and more prone to disease.C:The majority of the world'5 sugar now comes firm this particular commercial species.D:One major gene has been identified by Dr Angelique D'Hont and her team in Montpeller,France.E:Eventually,a commercial plant was developed which was 5 percent sweeter than before,but also much stronger and less likely to die from disease.F: Sugar cane is now much more vigorous and the supply of sugar is therefore more guaranteed.
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Text 3 In the early 1960s Wilt Chamberlain was one of only three players in the National Basketball Association（NBA）listed at over seven feet.If he had played last season,however,he would have been one of 42.The bodies playing major professional sports have changed dramatically over the years,and managers have been more than willing to adjust team uniforms to fit the growing numbers of bigger,longer frames.The trend in sports,though,may be obscuring an unrecognized reality:Americans have generally stopped growing.Though typically about two inches taller now than 140 years ago,today’s people–especially those born to families who have lived in the U.S.for many generations–apparently reached their limit in the early 1960s.And they aren’t likely to get any taller.“In the general population today,at this genetic,environmental level,we’ve pretty much gone as far as we can go,”says anthropologist William Cameron Chumlea of Wright State University.In the case of NBA players,their increase in height appears to result from the increasingly common practice of recruiting players from all over the world.Growth,which rarely continues beyond the age of 20,demands calories and nutrients–notably,protein–to feed expanding tissues.At the start of the 20th century,under-nutrition and childhood infections got in the way.But as diet and health improved,children and adolescents have,on average,increased in height by about an inch and a half every 20 years,a pattern known as the secular trend in height.Yet according to the Centers for Disease Control and Prevention,average height–5′9″for men,5′4″for women–hasn’t really changed since 1960.Genetically speaking,there are advantages to avoiding substantial height.During childbirth,larger babies have more difficulty passing through the birth canal.Moreover,even though humans have been upright for millions of years,our feet and back continue to struggle with bipedal posture and cannot easily withstand repeated strain imposed by oversize limbs.“There are some real constraints that are set by the genetic architecture of the individual organism,”says anthropologist William Leonard of Northwestern University.Genetic maximums can change,but don’t expect this to happen soon.ClaireC.Gordon,senior anthropologist at the Army Research Center in Natick,Mass.,ensures that 90 percent of the uniforms and workstations fit recruits without alteration.She says that,unlike those for basketball,the length of military uniforms has not changed for some time.And if you need to predict human height in the near future to design a piece of equipment,Gordon says that by and large,“you could use today’s data and feel fairly confident.”35.The text intends to tell us thatA.the change of human height follows a cyclic pattern.
B.human height is becoming even more predictable.
C.Americans have reached their genetic growth limit.
D.the genetic pattern of Americans has altered.
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第一篇Plant GasScientists have been studying natural sources of methane（甲烷，沼气）for decades but hadn't regarded plants as a producer, notes Frank Keppler, a geochemist（地球化学家）at the Max Planck Institute for Nuclear Physics in Heldelberg,Germany. Now Keppler and his colleagues find that plants,from grasses to trees,may also be sources of the greenhouse gas.This is really surprising, because most scientists assumed that methane production requires an oxygen-free environment.Previously,researchers had thought that it was impossible for plants to make significant amounts of the gas. They had assumed that microbes（微生物）need to be in environments without oxygen to produce methane.Methane is a greenhouse gas, like carbon dioxide.Gases such as methane and carbon dioxide trap heat in Earth's atmosphere and contribute to global warming.In its experiments, Keppler's team used sealed chambers（室，房间；腔）that contained the same concentration of oxygen that Earth's atmosphere has.They measured the amounts of methane that were released by both living plants and dried plant material,such as fallen leaves.With the dried plants,the researchers took measurement at temperatures ranging from 30 degrees Celsius to 70 degrees C.At 30 degrees C.,they found,a gram of dried plant material released up to 3 nanograms（微克）of methane per hour(One nanogram is a millionth of a gram). With every 10-degree rise in temperature,the amount of methane released each hour roughly doubled.Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour. Methane emissions tripled when living and dead plant was exposed to sunlight.Because there was plenty of oxygen available,it's unlikely that the types of bacteria(bacterium的复数，细菌）that normally make methane were involved. Experiments on plants that were grown in water rather than soil also resulted in methane emissions.That's another strong sign that the gas came from the plants and not soil microbes.The new finding is an"interesting observation,"says Jennifer Y. King,a biogeochemist（生物地球化学家）at the University of Minnesota in St. Paul. Because some types of soil microbes consume methane,they may prevent plant-produced methane from reaching the atmosphere.Field tests will be needed to assess the plant's influence,she notes.What is the beneficial point of some microbes consuming plant-produced methane?A:Methane becomes less poisonous.B:Methane is turned into a fertilizer.C:Less methane reaches the atmosphere.D:Air becomes cleaner.
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第一篇Plant GasScientists have been studying natural sources of methane（甲烷，沼气）for decades but hadn't regarded plants as a producer, notes Frank Keppler, a geochemist（地球化学家）at the Max Planck Institute for Nuclear Physics in Heldelberg,Germany. Now Keppler and his colleagues find that plants,from grasses to trees,may also be sources of the greenhouse gas.This is really surprising, because most scientists assumed that methane production requires an oxygen-free environment.Previously,researchers had thought that it was impossible for plants to make significant amounts of the gas. They had assumed that microbes（微生物）need to be in environments without oxygen to produce methane.Methane is a greenhouse gas, like carbon dioxide.Gases such as methane and carbon dioxide trap heat in Earth's atmosphere and contribute to global warming.In its experiments, Keppler's team used sealed chambers（室，房间；腔）that contained the same concentration of oxygen that Earth's atmosphere has.They measured the amounts of methane that were released by both living plants and dried plant material,such as fallen leaves.With the dried plants,the researchers took measurement at temperatures ranging from 30 degrees Celsius to 70 degrees C.At 30 degrees C.,they found,a gram of dried plant material released up to 3 nanograms（微克）of methane per hour(One nanogram is a millionth of a gram). With every 10-degree rise in temperature,the amount of methane released each hour roughly doubled.Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour. Methane emissions tripled when living and dead plant was exposed to sunlight.Because there was plenty of oxygen available,it's unlikely that the types of bacteria(bacterium的复数，细菌）that normally make methane were involved. Experiments on plants that were grown in water rather than soil also resulted in methane emissions.That's another strong sign that the gas came from the plants and not soil microbes.The new finding is an"interesting observation,"says Jennifer Y. King,a biogeochemist（生物地球化学家）at the University of Minnesota in St. Paul. Because some types of soil microbes consume methane,they may prevent plant-produced methane from reaching the atmosphere.Field tests will be needed to assess the plant's influence,she notes.To test whether plants are a source of methane,the scientists created_______.A:an oxygen-free environmentB:an environment with the same concentration of oxygen as the Earth hasC:a carbon dioxide-free environmentD:an environment filled with the greenhouse gas
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Text 4 Consuming high-quality plant foods such as whole grains,fruits,vegetables,nuts and legumes may substantially lower risk of developing type 2 diabetes,researchers including one of Indian-origin have claimed."This study highlights that even moderate dietary changes in the direction of a healthful plant-based diet can play a significant role in the prevention of type 2 diabetes,"said Ambika Satija from Harvard T.H.Chan School of Public Health in the US."These findings provide further evidence to support current dietary recommendations for chronic disease prevention,"she said.While previous studies have found links between vegetarian diets and improved health outcomes,including reduced risk of type 2 diabetes,this new study is the first to make distinctions between healthy plant-based diets and less healthy ones that include things like sweetened foods and beverages,which may be detrimental for health.The study also considered the effect of including some animal foods in the diet.Researchers followed more than 200,000 male and female health professionals in the US for more than 20 years who had regularly filled out questionnaires on their diet,lifestyle,medical history,and ncw disease diagnoses as part of three large long-term studies.They evaluated participants'diets using a plant-based diet index in which they assigned plant-derived foods higher scores and animal-derived foods lower scores.The study found that high adherence to a plant-based diet that was low in animal foods was associated with a 20 percent reduced risk of type 2 diabetes compared with low adherence to such a diet,researchers said.Eating a healthy version of a plant-based diet was linked with a 34 per cent lower diabetes risk,while a less healthy version-including foods such as refrned grains,potatoes,and sugar-sweetened beverages-was linked with a 16 per cent increased risk,they said.Even modestly lowering animal food consumption-for example,from 5-6 servings per day to about 4 servings per day-was linked with lower diabetes incidence,the study found."A shift to a dietary pattern higher in healthful plant-based foods,such as vegetables,fruits,whole grains,legumes,nuts,and seeds,and lower in animal-based foods,especially red and processed meats,can confer substantial health benefits in reducing risk of type 2 diabetes,"said Frank Hu from Harvard Chan School.Researchers suggest that healthful plant-based diets could be lowering type 2 diabetes risk because such diets are high in fiber,antioxidants,unsaturated fatty acids,and micronutrients such as magnesium,and are low in saturated fat.Healthy plant foods may also be contributing to a healthy gut microbiome,they said.
The author's attitude towards refined grains is_____.A.supportive
B.indifferent
C.negative
D.critical
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Text 4 Consuming high-quality plant foods such as whole grains,fruits,vegetables,nuts and legumes may substantially lower risk of developing type 2 diabetes,researchers including one of Indian-origin have claimed."This study highlights that even moderate dietary changes in the direction of a healthful plant-based diet can play a significant role in the prevention of type 2 diabetes,"said Ambika Satija from Harvard T.H.Chan School of Public Health in the US."These findings provide further evidence to support current dietary recommendations for chronic disease prevention,"she said.While previous studies have found links between vegetarian diets and improved health outcomes,including reduced risk of type 2 diabetes,this new study is the first to make distinctions between healthy plant-based diets and less healthy ones that include things like sweetened foods and beverages,which may be detrimental for health.The study also considered the effect of including some animal foods in the diet.Researchers followed more than 200,000 male and female health professionals in the US for more than 20 years who had regularly filled out questionnaires on their diet,lifestyle,medical history,and ncw disease diagnoses as part of three large long-term studies.They evaluated participants'diets using a plant-based diet index in which they assigned plant-derived foods higher scores and animal-derived foods lower scores.The study found that high adherence to a plant-based diet that was low in animal foods was associated with a 20 percent reduced risk of type 2 diabetes compared with low adherence to such a diet,researchers said.Eating a healthy version of a plant-based diet was linked with a 34 per cent lower diabetes risk,while a less healthy version-including foods such as refrned grains,potatoes,and sugar-sweetened beverages-was linked with a 16 per cent increased risk,they said.Even modestly lowering animal food consumption-for example,from 5-6 servings per day to about 4 servings per day-was linked with lower diabetes incidence,the study found."A shift to a dietary pattern higher in healthful plant-based foods,such as vegetables,fruits,whole grains,legumes,nuts,and seeds,and lower in animal-based foods,especially red and processed meats,can confer substantial health benefits in reducing risk of type 2 diabetes,"said Frank Hu from Harvard Chan School.Researchers suggest that healthful plant-based diets could be lowering type 2 diabetes risk because such diets are high in fiber,antioxidants,unsaturated fatty acids,and micronutrients such as magnesium,and are low in saturated fat.Healthy plant foods may also be contributing to a healthy gut microbiome,they said.
The best title for the text should be_____A.Plant-Based Diet May Lower Risk ofType 2 Diabetes
B.Better Not to Eat Too Many Animal Foods
C.We Should Eat Vegetable Foods to Prevent Chronic Diseases
D.Plant-Based Diet with High Fiber and Low Fat Is Beneficial
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The Worker 's Role in ManagementTraditionally,it has been the workers'role to work and management's role to manage.Managers have planned and directed the firm's operations with little thought of consulting the labor force.Managers have rarely felt compelled（被迫的）to obtain the workers ' opinions or to explain their decisions to their employees.At most,companies have provided"suggestion boxes"in which workers could place ideas for improving procedures.In recent years,however,many management specialists have been arguing that workers are more than sellers of labor-they have a vital stake in the company and may be able to make significant contributions to its management.Furthermore,major company decisions profoundly affect workers and their dependents.This isparticularly true of plant closings,which may put thousands on the unemployment lines.Should workers, then,play a stronger role in management?Workers should have a role in management.At the very least,the labor force should be informed of major policy decisions(A common complaint among rank-and-file workers is the lack of information about company policies and actions).Between 1980 and 1985 about five million workers were the victims of plant closings and permanent layoffs（失业）,often with no warning.At least 90 days'notice ought to be given in such instances so that workers have time to adjust.Management should consult workers before closing a plant,because the workers might be able to suggest ways of improving productivity and reducing costs and might be willing to make concessions that will help keep the plant operating.It should become a general practice to include workers in some managerial decision making.There ought to be representatives of the workers on the firm's board of directors or other major policymaking groups.If rank-and-file workers are given a voice in the planning and management of the work flow,they will help to make improvements,their morale will rise,and their productivity will increase.As a further incentive,they must be given a share in the company's profits.This can be done through employee stock-ownership plans,bonuses,or rewards for efficiency and productivity.Finally,when a plant can no longer operate at a profit,the workers should be given the opportunity to purchase the plant and run it themselves.According to the passage,what happened between 1980 and 1985?A:Managers consulted workers before closing a plant.B:Workers did not make necessary concessions.C:About five million workers were laid off without advance notice.D:Many companies were closed because of strikes.
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The Tough Grass That Sweetens Our LivesSugar cane was once a wild grass that grew in New Guinea and was used by local people for roofing their houses and fencing their gardens. Gradually a different variety evolved which contained sucrose（蔗糖） and was chewed on for its sweet taste.Over time,sugar cane became a highly valuable commercial plant,grown throughout the world.___________(46)Sugar became a vital ingredient in all kinds of things , from confectionery（糖果点心）to medicine, and,as the demand for sugar grew,the industry became larger and more profitable.________(47)Many crops withered（枯萎）and died,despite growers'attempts to save them,and there were fears that the health of the plant would continue to deteriorate.In the 1960s,scientists working in Barbados looked for ways to make the commercial species stronger and more able to resist disease.They experimented with breeding programmes,mixing genes from the wild species of sugar cane,which tends to be tougher,with genes from the more delicate,commercial type. ________(48)This sugar cane is not yet ready to be sold commercially,but when this happens,it is expected to be incredibly profitable for the industry.__________(49)Brazil,which produces one quarter of the world's sugar,has coordinated an interna-tional project under Professor Paulo Arrudo of the Universidade Estaudual de Campinas in Sao Paulo.Teamsof experts have worked with him to discover more about which parts of the genetic structure of the plant are important for the production of sugar and its overall health.Despite all the research,however,we still do not fully understand how the genes act in sugar cane._________(50)This gene is particularly exciting because it makes the plant resistant to rust,a disease which probably originated in India,but is now capable of infecting sugar cane across the world.Scientists believe they will eventually be able to grow a plant which cannot be destroyed by rust._________（46）A:Eventually,a commercial plant was developed which was 5 percent sweeter than before,but also much stronger and less likely to die from disease.B:Unfortunately,however,the plant started to become weaker and more prone to disease.C: One major gene has been identified by Dr Angelique D, Hont and her team in Montpelier, France.D:The majority of the world's sugar now comes from this particular commercial species.E:Sugar cane is now much more vigorous and the supply of sugar is therefore more guaranteed.F: Since the 1960s,scientists have been analysing the mysteries of the sugar cane'S genetic code.
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The Worker 's Role in ManagementTraditionally,it has been the workers'role to work and management's role to manage.Managers have planned and directed the firm's operations with little thought of consulting the labor force.Managers have rarely felt compelled（被迫的）to obtain the workers ' opinions or to explain their decisions to their employees.At most,companies have provided"suggestion boxes"in which workers could place ideas for improving procedures.In recent years,however,many management specialists have been arguing that workers are more than sellers of labor-they have a vital stake in the company and may be able to make significant contributions to its management.Furthermore,major company decisions profoundly affect workers and their dependents.This isparticularly true of plant closings,which may put thousands on the unemployment lines.Should workers, then,play a stronger role in management?Workers should have a role in management.At the very least,the labor force should be informed of major policy decisions(A common complaint among rank-and-file workers is the lack of information about company policies and actions).Between 1980 and 1985 about five million workers were the victims of plant closings and permanent layoffs（失业）,often with no warning.At least 90 days'notice ought to be given in such instances so that workers have time to adjust.Management should consult workers before closing a plant,because the workers might be able to suggest ways of improving productivity and reducing costs and might be willing to make concessions that will help keep the plant operating.It should become a general practice to include workers in some managerial decision making.There ought to be representatives of the workers on the firm's board of directors or other major policymaking groups.If rank-and-file workers are given a voice in the planning and management of the work flow,they will help to make improvements,their morale will rise,and their productivity will increase.As a further incentive,they must be given a share in the company's profits.This can be done through employee stock-ownership plans,bonuses,or rewards for efficiency and productivity.Finally,when a plant can no longer operate at a profit,the workers should be given the opportunity to purchase the plant and run it themselves.It can be inferred from Paragraph 1 that managers______.A:seldom obtained workers'opinionsB:were not qualifiedC:disliked"suggestion boxes"D:never consulted the labor force
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The Worker 's Role in ManagementTraditionally,it has been the workers'role to work and management's role to manage.Managers have planned and directed the firm's operations with little thought of consulting the labor force.Managers have rarely felt compelled（被迫的）to obtain the workers ' opinions or to explain their decisions to their employees.At most,companies have provided"suggestion boxes"in which workers could place ideas for improving procedures.In recent years,however,many management specialists have been arguing that workers are more than sellers of labor-they have a vital stake in the company and may be able to make significant contributions to its management.Furthermore,major company decisions profoundly affect workers and their dependents.This isparticularly true of plant closings,which may put thousands on the unemployment lines.Should workers, then,play a stronger role in management?Workers should have a role in management.At the very least,the labor force should be informed of major policy decisions(A common complaint among rank-and-file workers is the lack of information about company policies and actions).Between 1980 and 1985 about five million workers were the victims of plant closings and permanent layoffs（失业）,often with no warning.At least 90 days'notice ought to be given in such instances so that workers have time to adjust.Management should consult workers before closing a plant,because the workers might be able to suggest ways of improving productivity and reducing costs and might be willing to make concessions that will help keep the plant operating.It should become a general practice to include workers in some managerial decision making.There ought to be representatives of the workers on the firm's board of directors or other major policymaking groups.If rank-and-file workers are given a voice in the planning and management of the work flow,they will help to make improvements,their morale will rise,and their productivity will increase.As a further incentive,they must be given a share in the company's profits.This can be done through employee stock-ownership plans,bonuses,or rewards for efficiency and productivity.Finally,when a plant can no longer operate at a profit,the workers should be given the opportunity to purchase the plant and run it themselves.In recent years,many management specialists have been arguing that workers______.A:are no longer sellers of the productsB:are less affected by company decisions than beforeC:are able to make final decisions for the companyD:should have a say in management of the company
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The Worker 's Role in ManagementTraditionally,it has been the workers'role to work and management's role to manage.Managers have planned and directed the firm's operations with little thought of consulting the labor force.Managers have rarely felt compelled（被迫的）to obtain the workers ' opinions or to explain their decisions to their employees.At most,companies have provided"suggestion boxes"in which workers could place ideas for improving procedures.In recent years,however,many management specialists have been arguing that workers are more than sellers of labor-they have a vital stake in the company and may be able to make significant contributions to its management.Furthermore,major company decisions profoundly affect workers and their dependents.This isparticularly true of plant closings,which may put thousands on the unemployment lines.Should workers, then,play a stronger role in management?Workers should have a role in management.At the very least,the labor force should be informed of major policy decisions(A common complaint among rank-and-file workers is the lack of information about company policies and actions).Between 1980 and 1985 about five million workers were the victims of plant closings and permanent layoffs（失业）,often with no warning.At least 90 days'notice ought to be given in such instances so that workers have time to adjust.Management should consult workers before closing a plant,because the workers might be able to suggest ways of improving productivity and reducing costs and might be willing to make concessions that will help keep the plant operating.It should become a general practice to include workers in some managerial decision making.There ought to be representatives of the workers on the firm's board of directors or other major policymaking groups.If rank-and-file workers are given a voice in the planning and management of the work flow,they will help to make improvements,their morale will rise,and their productivity will increase.As a further incentive,they must be given a share in the company's profits.This can be done through employee stock-ownership plans,bonuses,or rewards for efficiency and productivity.Finally,when a plant can no longer operate at a profit,the workers should be given the opportunity to purchase the plant and run it themselves.If not given a voice in managerial decision making,workers______.A:may lack the incentive to increase their productivityB:cannot get a share in the company's profitsC:can still get bonuses for efficiency and productivityD:will not have the opportunity to purchase the plant
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The Worker 's Role in ManagementTraditionally,it has been the workers'role to work and management's role to manage.Managers have planned and directed the firm's operations with little thought of consulting the labor force.Managers have rarely felt compelled（被迫的）to obtain the workers ' opinions or to explain their decisions to their employees.At most,companies have provided"suggestion boxes"in which workers could place ideas for improving procedures.In recent years,however,many management specialists have been arguing that workers are more than sellers of labor-they have a vital stake in the company and may be able to make significant contributions to its management.Furthermore,major company decisions profoundly affect workers and their dependents.This isparticularly true of plant closings,which may put thousands on the unemployment lines.Should workers, then,play a stronger role in management?Workers should have a role in management.At the very least,the labor force should be informed of major policy decisions(A common complaint among rank-and-file workers is the lack of information about company policies and actions).Between 1980 and 1985 about five million workers were the victims of plant closings and permanent layoffs（失业）,often with no warning.At least 90 days'notice ought to be given in such instances so that workers have time to adjust.Management should consult workers before closing a plant,because the workers might be able to suggest ways of improving productivity and reducing costs and might be willing to make concessions that will help keep the plant operating.It should become a general practice to include workers in some managerial decision making.There ought to be representatives of the workers on the firm's board of directors or other major policymaking groups.If rank-and-file workers are given a voice in the planning and management of the work flow,they will help to make improvements,their morale will rise,and their productivity will increase.As a further incentive,they must be given a share in the company's profits.This can be done through employee stock-ownership plans,bonuses,or rewards for efficiency and productivity.Finally,when a plant can no longer operate at a profit,the workers should be given the opportunity to purchase the plant and run it themselves.The word"rank-and-file" in Paragraph 2 is closest in meaning to______.A:seniorB:ordinaryC:intelligentD:capable
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What is computer- vision researchers’main concern of iPhone X’s FaceID？( ) A.They have concerns of the security and convenience of FacelD.
B.They don’t believe iPhone X’s FaceID can successfully unlock a phone every time.
C.They have doubts of its technique to overcome variable lighting and subtle change of the user’s face.
D.They are mainly worried about the smartphone’s accuracy.
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问答题Practice 4 If ambition is to be well regarded, the rewards of ambition—wealth, distinction, control over one’s destiny—must be deemed worthy of the sacrifices made on ambition’s behalf. If the tradition of ambition is to have vitality, it must be widely shared, and it especially must be highly regarded by people who are themselves admired, the educated not least among them. In an odd way, however, it is the educated who have claimed to have given up on ambition as an ideal. What is odd is that they have perhaps most benefited from ambition, if not always their own then that of their parents and grandparents.
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问答题Practice 1 If chief executives of leading U. S. agri-biotech companies have been suffering from heartburn lately, it isn’t because of anything they’ve been eating. Rather, it’s the unsettling knowledge that long-simmering European anxieties over genetically modified (g. m.) crops, like ocean-hopping viruses, are spreading across the world. Unlike Britons, whose concerns about what they eat have been on the rise ever since “mad cow disease” (even though it had nothing to do with genetic engineering), Americans have seemed indifferent to g.m. foods. If foodmakers can no longer count on the public’s unquestioning acceptance of their products, it’s not just because of activist theatrics and shrill agitprop. With billions of dollars at risk, the biotech industry has begun to fight back, forming corporate alliances and launching a major p. r. effort that includes lobbying, new research efforts to still public fears and TV, radio and newspaper ads. So far, the regulators have approved dozens of genetically modified plants for human consumption. But if public pressure grows, it may be forced to go slower in the future. One possibility: the FDA could begin applying to g.m. foods the powers it already has to regulate food additives. By overreacting to fears fanned by well-fed consumers in the industrialized world, food producers might uproot an industry that could someday provide billions of people in the rest of the world with crops they desperately need.
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单选题- What about the commission？（）A
Of course， I’d give you our lowest quotationB
I’m afraid you have to tell me how large your order is going to beC
It’s a general practice everywhere else
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问答题Practice 13 (1) Actually, the world’s birth rate is falling. But so is death rate, as medical advances have made it possible for man to live longer than before. Such advances have also reduced baby death rate. (2) Unless population growth is reduced, the world population may reach l2 billion in a century. Is the earth capable of providing a good life for so large a population?
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问答题Practice 1 Genetic researchers have accelerated a plant’s growth by making its cells split faster—a technique that could someday lead to healthier crops, shorter growing seasons and less use of herbicides. One outside scientist called the findings astonishing. But the technique needs more testing on a range of plants, and public fear of genetically modified food is jeopardizing support for such experiments, especially in Europe, researchers said. The experiment, reported Thursday in the journal Nature, was carried out by a team at Cambridge University. The researchers first took a gene promoting cell division from inside the Arabidopsis plant, a flowering weed often used for genetic experiments. They transplanted that gene into a tobacco plant. There, in an especially potent form, the gene produced large amounts of a protein that, in combination with other chemicals naturally in the tobacco, made the plant’s cells divide more quickly at the tips of roots and shoots. Within a month after planting, the altered tobacco grew as much as twice as tall as other tobacco plants. Ultimately, the other plants caught up, and both groups then appeared identical in all ways. “It’s sort of like they’ve been able to make the plant go full throttle,” a said plant growth biologist John Schiefelbein at the University of Michigan. The leader of the study, Claire Cockcroft, said it is conceivable that the technique could be transferred to other species. Such plants, which probably would take years to develop commercially, might allow an extra planting in some climates or the introduction of crops in places where the growing season is too short, researchers said. The quick-growth plants would presumably take hold more easily, requiring less chemical herbicide to knock out weeds. Such plants might make easier and cheaper sources of some drugs. In scientific circles, the British research may also help settle an intense debate over what makes plants grow. Some argue, like these researchers, that something at the cellular level switches on growth; others look to hormones or other chemicals at a higher level of the plant’s makeup. “This is astonishing. Normally you would expect growth regulation to be more complicated,” said plant researcher Xuemin Wang at Kansas State University. “This has huge implications in terms of how we look at plant growth.” Biotechnology companies have genetically manipulated fruits and vegetables to make them more attractive or resistant to insects and disease. Genetic work has shown some early promise for faster growth, too. But previous attempts to boost growth through faster cell division have produced more cells—but smaller ones—and no overall growth. Scientists said such work is safe, with little chance of accidentally turning an unwanted plant into a fast-growing weed. After all, crops have been selectively bred for decades to bring out certain traits. However, ethicist Jeffrey Burkhardt at the University of Florida’s Institute of Food and Agricultural Sciences said selective breeding takes perhaps 15 years, giving scientists ample time to see the implications. “With the new biotechnology, you’re potentially moving traits in and out within a year,” he said.
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问答题Practice 2 Transgenic plants and animals result from genetic engineering experiments in which genetic material is moved from one organism to another, so that the latter will exhibit a characteristic. Business corporations, scientists, and farmers hope that transgenic techniques will allow more cost-effective and precise plants and animals with desirable characteristics that are not available using up to date breeding technology. Transgenic techniques allow genetic material to be transferred between completely unrelated organisms. In order for a transgenic technique to work, the genetic engineer must first construct a transgene, which is the gene to be introduced plus a control sequence. When making a transgene, scientists usually substitute the original promoter sequence with one that will be active in the correct tissues of the recipient plant or animal. The creation of transgenic animals is one of the most dramatic advances derived from recombinant DNA technology. A transgenic animal results from insertion of a foreign gene into an embryo. The foreign gene becomes a permanent part of the host animals’ genetic material. As the embryo develops, the foreign gene may be present in many cells of the body, including the germ cells of the testis or the ovary. If the transgenic animal is fertile, the inserted foreign gene (transgene) will be inherited by future progeny. Thus, a transgenic animal, once created, can persist into future generations. Transgenic animals are different from animals in which foreign cells or foreign organs have been engrafted. The progeny of engrafted animals do not inherit the experimental change. The progeny of transgenic animals do. The techniques for creating a transgenic animal include the following: 1) picking a foreign gene, 2) placing the foreign gene in a suitable form called a “construct” which guides the insertion of the foreign gene into the animal genome and encourages its expression, and 3) injecting the construct into a single fertilized egg or at the very early embryo stage of the host animal. Much genetic engineering goes into the choice of a foreign gene and building a construct. The construct must have promoters to turn on foreign gene expression at its new site within the host animal genome. By choosing a particular promoter and splicing it in front of the foreign gene, we can encourage expression of our transgene within a specific tissue. One of the most important applications of transgenic animals is the development of new animal models of human disease. Transgenic animals can serve as models for many malignant tumors. Mice have been the most frequent hosts for transgenic modification, other domestic animals have also been used. One idea has been to create transgenic cows which secrete important pharmaceutical substances in their milk. Other attempts are being made to express human interferon in the milk of sheep. A transgenic crop plant contains a gene or genes which have been artificially inserted instead of the plant acquiring them through pollination. The inserted gene sequence (known as the transgene) may come from another unrelated plant, or from a completely different species: transgenic BT corn, for example, which produces its own insecticide, containing a gene from a bacterium. Plants containing transgenes are often called genetically modified or GM crops although in reality all crops have been genetically modified from their original wild state by domestication, selection and controlled breeding over long periods of time.
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问答题题目要求: In this part of the test, you are asked to give a short talk on a business topic. You have to choose one of the topics from the two below and then talk for about one minute. You have one minute to prepare your ideas.Practice 1 A: What is important when...? Attending an interview ●Punctuality ●Manner ●Appearance B: What is important when...? Working in a team ●Having a team leader ●Deciding people’s responsibilities ●Sharing information
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单选题According to Mark Thomas, we can infer that _____.A
in Europe, people with longevity must not be lactase persistence.B
a genetic mutation on lactase persistence changed people’s life.C
the European people benefit from genetic change.D
the Europeans have superior survival advantage to other human races.
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