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______ the brain’s working is a tremendous challenge and, judging by the advance of current processor power and complexity, will take at least several decades more to reach even the most elementary levels.
A.Increasing
B.Imitating
C.Observing
D.Speculating
B.Imitating
C.Observing
D.Speculating
参考答案
参考解析
解析：本题考察词义辨析。题目意为“模仿人类脑部的工作是一项巨大的挑战，以目前的处理程序的能力及复杂性来衡量，即使是达到最初级的水平也至少需要几十年。”A选项意为“增加，加大”，B选项意为“模仿，效仿”，C选项意为“观察，注意”，D选项意为“投机，推测”。根据题意，应该是试图模拟人类的大脑工作。
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Global WarmingFew people now question the reality of global warming and its effects on the world's climate. Many scientists1the blame for recent natural disasters on the increase2the world's temperatures and are convinced that,more than3before,the Earth is at4from the forces of the wind,rain and sun.5to them,global warming is making extreme weather events,6as hurricanes and droughts,even more7and causing sea levels all around the world to8.Environmental groups are putting9on governments to take action to reduce the 10 of carbon dioxide which is given 11 by factories and power plants,thus attacking the problem at its source. They are in12of more money being spent on research into so-lar,wind and wave energy devices,which could then replace existing power13.Some scientists,14believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow,we would have to wait15hundred years to notice the results. Global warming,it seems,is here to stay.15._________A: several B: over C: numerous D: various
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Climate Change:The Long Reach1.Earth is warming.Sea levels are rising.There's more carbon in the air,and Arctic ice is melting faster than at any time in recorded history.Scientists who study the environment to better gauge（评估） Earth's future climate now argue that these changes may not reverse for a very long time.2.People burn fossil fuels like coal and oil for energy.That burning releases carbon dioxide,a colorless gas.In the air,this gas traps heat at Earth's surface.And the more carbon dioxide released,the more the planet warms.If current consumption of fossil fuels doesn't slow,the long-term climate impacts could last thousands of years-and be more severe than scientists had been expecting.Climatologist Richard Zeebe of the University of Hawaii at Manoa offers this conclusion in a new paper.3.Most climate-change studies look at what's going to happen in the next century or so.During that time , changes in the planet's environment could nudge（推动）global warming even higher.For example, snow and ice reflect sunlight back into space.But as these melt,sunlight can now reach-and warm-the exposed ground.This extra heat raises the air temperature even more,causing even more snow to melt.This type of rapid exaggeration of impacts is called a"fast feedback".4.Zeebe says it's important to look at fast feedbacks.However,he adds,they're limited.From a climate change perspective,"This century is the most important time for the next few generations,"he told Science News."But the world is not ending in 2100."For this new study,Zeebe now focuses on"slow feedbacks".While fast feedback events unfold over decades or centuries,slow feedbacks can take thousands of years.Melting of continental ice sheets and the migration of plant life-as they relocate to more comfortable areas-are two examples of slow feedbacks.5.Zeebe gathered information from previously published studies investigating how such processes played out over thousands of years during past dramatic changes in climate.Then he came up with a forecast for the future that accounts for both slow and fast feedback processes.Climate forecasts that use only fast feedbacks predict a 4.5 degree Celsius(8.1 degree Fahrenheit)change by the year 3000.But slow feedbacks added another 1.5℃-for a 6℃ total increase,Zeebe reports.He also found that slow feedback events will cause global warming to persist for thousands of years after people run out of fossil fuels to burn.Paragraph 4______A:Fast FeedbacksB:A Prediction of Future Climate ChangeC:Rising of Sea LevelsD:Slow FeedbacksE:Impact of Burning Fossil FuelsF:Unpredictability Feedback Processes
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Climate Change:The Long Reach1.Earth is warming.Sea levels are rising.There's more carbon in the air,and Arctic ice is melting faster than at any time in recorded history.Scientists who study the environment to better gauge（评估） Earth's future climate now argue that these changes may not reverse for a very long time.2.People burn fossil fuels like coal and oil for energy.That burning releases carbon dioxide,a colorless gas.In the air,this gas traps heat at Earth's surface.And the more carbon dioxide released,the more the planet warms.If current consumption of fossil fuels doesn't slow,the long-term climate impacts could last thousands of years-and be more severe than scientists had been expecting.Climatologist Richard Zeebe of the University of Hawaii at Manoa offers this conclusion in a new paper.3.Most climate-change studies look at what's going to happen in the next century or so.During that time , changes in the planet's environment could nudge（推动）global warming even higher.For example, snow and ice reflect sunlight back into space.But as these melt,sunlight can now reach-and warm-the exposed ground.This extra heat raises the air temperature even more,causing even more snow to melt.This type of rapid exaggeration of impacts is called a"fast feedback".4.Zeebe says it's important to look at fast feedbacks.However,he adds,they're limited.From a climate change perspective,"This century is the most important time for the next few generations,"he told Science News."But the world is not ending in 2100."For this new study,Zeebe now focuses on"slow feedbacks".While fast feedback events unfold over decades or centuries,slow feedbacks can take thousands of years.Melting of continental ice sheets and the migration of plant life-as they relocate to more comfortable areas-are two examples of slow feedbacks.5.Zeebe gathered information from previously published studies investigating how such processes played out over thousands of years during past dramatic changes in climate.Then he came up with a forecast for the future that accounts for both slow and fast feedback processes.Climate forecasts that use only fast feedbacks predict a 4.5 degree Celsius(8.1 degree Fahrenheit)change by the year 3000.But slow feedbacks added another 1.5℃-for a 6℃ total increase,Zeebe reports.He also found that slow feedback events will cause global warming to persist for thousands of years after people run out of fossil fuels to burn.Melting of snow and ice enables sunlight to reach______.A:the extra heatB:rapid exaggeration of impactsC:the exposed groundD:recorded historyE:a very long timeF:previously published studies
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Read with Greater SpeedDo you have difficulty reading in class?if so,a special reading program that helpsmatch sounds with letters could speed up your brain.At least one out of every five elementary school students in the US has trouble learningto read,even when the students are good at other subjects._________(1)Researchers from Yale University,US,studied a group of children from New Yorkand Connecticut State.As part of the study,37 struggling readers received special tutoring.Every day,instructors worked with them on recognizing how written letters representunits of sound called phonemes（音素）.__________(2)By the end of the school year,these children could read faster than before.They alsomade fewer mistakes,and understood more of what they read than they could earlier in theyear.As part of their study,the researchers used a special machine to take action photos of the students' brains._________(3)This is the same part of the brain that becomes active when goodreaders read.This activated brain area appears to include a structure that helps peoplerecognize familiar written words quickly. In lower level readers,this structure remainsinactive.A year later,the brain structure was still working hard in the students who had gonethrough the special tutoring,and they continued to do well in reading tests.________ (4)However,some researchers still doubt the study._________(5)_________（3）A:Many adults are interested in matching sounds with letters.B:The students also practiced reading aloud and spelling.C:The biggest challenge for many of these kids,scientists say,is matching sounds with letters.D:Another group in the study who went through a more traditional reading program didn't show the same progress.E:The pictures showed an increase in activity in the back of the brain on the left side.F:They believe that reading without making any noise or linking words to sounds is more efficient.
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第三篇 Smart ExerciseDoctors are starting to find more and more information that suggests a connection between exercise and brain development.Judy Cameron,a scientist at Oregon Health and Science University,studies brain development.According to her research,it seems that exercise can make blood vessels,including those in the brain,stronger and more fully developed.Dr. Cameron claims this allows people who exercise to concentrate better. As she says:"While we already know that exercise is good for the heart,exercise can literally cause physical changes in the brain."The effects of exercise on brain development can even be seen in babies.Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active.With babies,even a{ittle movement can show big results. Margaret Barnes , a pediatrician（儿科医师）,believes in the importance of exercise.She thinks that many learning disabilities that children have in elementary school or high school can be traced back to a lack of movement as babies. "Babies need movement that stimulates their five senses.They need to establish a connection between motion and memory.In this way,as they get older,children will begin to associate physical activity with higher learning,"says Margaret. Older people can beef up their brains as well.Cornell University studied a group of seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week.The exercise does not have to be very difficult,but it does have to increase the heart rate.Also,just like the motion for infants,exercise for older people should involve some complexity.Learning some new skills or motions helps to open up memory paths in the brain that may not havebeen used for a long time.For most people,any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brain's flow of blood.And your brain can benefit from as little as two to three hours of exercise a week. To be beneficial,exercise for older people shouldA:be done in a group. B: be done on a daily basis.C: involve great difficulty. D:increase the heart rate.
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第三篇 Smart ExerciseDoctors are starting to find more and more information that suggests a connection between exercise and brain development.Judy Cameron,a scientist at Oregon Health and Science University,studies brain development.According to her research,it seems that exercise can make blood vessels,including those in the brain,stronger and more fully developed.Dr. Cameron claims this allows people who exercise to concentrate better. As she says:"While we already know that exercise is good for the heart,exercise can literally cause physical changes in the brain."The effects of exercise on brain development can even be seen in babies.Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active.With babies,even a{ittle movement can show big results. Margaret Barnes , a pediatrician（儿科医师）,believes in the importance of exercise.She thinks that many learning disabilities that children have in elementary school or high school can be traced back to a lack of movement as babies. "Babies need movement that stimulates their five senses.They need to establish a connection between motion and memory.In this way,as they get older,children will begin to associate physical activity with higher learning,"says Margaret. Older people can beef up their brains as well.Cornell University studied a group of seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week.The exercise does not have to be very difficult,but it does have to increase the heart rate.Also,just like the motion for infants,exercise for older people should involve some complexity.Learning some new skills or motions helps to open up memory paths in the brain that may not havebeen used for a long time.For most people,any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brain's flow of blood.And your brain can benefit from as little as two to three hours of exercise a week. Research by Dr.Cameron seems to suggest that exercise canA: generate new blood vessels. B:change the way a person thinks.C: promote brain development. D: divert one's attention.
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第三篇 Smart ExerciseDoctors are starting to find more and more information that suggests a connection between exercise and brain development.Judy Cameron,a scientist at Oregon Health and Science University,studies brain development.According to her research,it seems that exercise can make blood vessels,including those in the brain,stronger and more fully developed.Dr. Cameron claims this allows people who exercise to concentrate better. As she says:"While we already know that exercise is good for the heart,exercise can literally cause physical changes in the brain."The effects of exercise on brain development can even be seen in babies.Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active.With babies,even a{ittle movement can show big results. Margaret Barnes , a pediatrician（儿科医师）,believes in the importance of exercise.She thinks that many learning disabilities that children have in elementary school or high school can be traced back to a lack of movement as babies. "Babies need movement that stimulates their five senses.They need to establish a connection between motion and memory.In this way,as they get older,children will begin to associate physical activity with higher learning,"says Margaret. Older people can beef up their brains as well.Cornell University studied a group of seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week.The exercise does not have to be very difficult,but it does have to increase the heart rate.Also,just like the motion for infants,exercise for older people should involve some complexity.Learning some new skills or motions helps to open up memory paths in the brain that may not havebeen used for a long time.For most people,any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brain's flow of blood.And your brain can benefit from as little as two to three hours of exercise a week.Margaret Barnes thinks that a lack of movement in infancy canA:lead to learning troubles later. B:cause physical disabilities later.C:stimulate the five senses. D:bring about changes in the brain.
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Read With Greater SpeedDo you have difficulty reading in class?If so,a special reading program that helpsmatch sounds with letters could speed up your brain.At least one out of every five elementary school students in the U.S. has troublelearnina to read .even when the students are good at other subjects.________(1)Researchers from Yale University,U.S.,studied a group of children trom New YorK and Connecticut State.As part of the study,37 struggling readers received special tutoring.Every day,instructors worked with them on recognizing how written letters representunits of sound called phonemes（音素）.________(2)By the end of the school year,these children could read faster than before.They also made fewer mistakes,and understood more of what they read than they coula earlier in theyear.As part of their study,the researchers used a special machine to take action photos ofthe students' brains.________(3)This is the same part of the brain that becomes active when goodreaders read.This activated brain area appears to include a structure that helps people recognize familiar written words quickly.In lower level readers,this structure remains inactive. A year later,the brain structure was still working hard in the students who had gone throughthe special tutoring,and they continued to do well in reading tests.________(4) However,some researchers still doubt the study.________(5)________(5)A:Many adults are interested in matching sounds with letters.B:The students also practiced reading aloud and spelling.C:The biggest challenge for many of these kids,scientists say,is matching sounds with letters.D:Another group in the study who went through a more traditional reading program didn't show the same progress.E:The pictures showed an increase in activity in the back of the brain on the left side.F:They believe that reading without making any noise or linking words to sounds is more efficient.
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Renewable Energy SourcesToday petroleum provides around 40%of the world's energy needs,mostly fuelling automobiles .Coal is still used,mostly in power stations,to cover one-quarter of our energy needs,but it is the least efficient,unhealthiest and most environmentally damaging fossil fuel.Natural gas reserves could plug some of the gap from oil,but reserves of that will not last into the 22nd century either.Most experts predict we will exhaust easily accessible reserves within 50 years.We could fasi reach an energy crisis.We need to rapidly develop sustainable solutions to fuel our future.Lesspolluting renewable energy sources offer a more practical long-term energy solution.They may benefit the world's poor too."Renewable"refers to the fact that these resources are not used faster than they can be replaced.The Chinese and Romans used watermills over 2,000 years ago. But the first hydroelectric dam was built in England in 1870.Hydroelectric power is now the most common form of renewable energy,supplying around 20%of world electricity. China's Three Gorges Dam,which has just been completed,is the largest ever. At five times the size of the US's Hoover Dam,its 26 turbines will generate the equivalent energy of 1 8 coal-fired power stations.It will satisfy 3%of China's entire electricity demand.Surprisingly,some argue that hydroelectric dams significantly contribute green- house gases.In 2003,the first commercial power station to harness tidal currents in the open sea opened in Norway .It is designed like windmill,but others take the form of turbines.As prices fall,wind power has become the fastest growing type of electricity generation-quadrupling worldwide between 1999 and 2005 .Modern wind farms consist of turbines that gener- ate electricity.Though it will be more expensive,there is more than enough wind to provide the world's entire energy needs. Wind farms come in onshore and offshore forms.They can often end up at spots of natural beauty,and are often unpopular with residents.And turbines are not totally benignthey can interfere with radar and leave a significant ecological footprint,altering climate and killing sea birds.Migrating birds may have more luck avoiding them.Scotland is buildingEurope's largest wind farm,which will power 200,000 homes.The UK's goal is to generate one- fifth of power from renewable sources,mainly wind,by 2020 .But this may cause problems,be- cause wind is unreliable. Which of the following statements is true of wind power?A: There is plenty of wind to provide the world's entire energy needs.B: It is the most rapidly growing type of electricity production.C: It may not he reliable.D: All of the above.
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Albert Einstein's Brain1.It doesn't take an Einstein to recognize that Albert Einstein's brain was very different from yours and mine.The gray matter housed inside that shaggy head managed to revolutionize our concepts of time,space,motion一the very foundations of physical reality一not just once but several times during his astonishing career. Yet while there clearly had to be something remarkable about Einstein's brain,the pathologist who removed it from the great physicist's skull after his death reported that the organ was,to all appearances,well within the normal range一no bigger or heavier than anyone else's.2.But a new analysis of Einstein's brain by Canadian scientists,reported in the current Lancet, reveals that it has some distinctive physical characteristics after all. A portion of the brain that governs mathematical ability and spatial reasoning一two key ingredients to the sort of thinking Einstein did best一was significantly larger than average and may also have had more interconnections among its cells,which could have allowed them to work together more effectively.3.In 1996,Harvey gave much of his data and a significant fraction of the tissue itself to Dr. Sandra Witelson,a neuroscientist who maintains a"brain bank"at McMaster for comparative studies of brain structure and function.These normal,undiseased brains,willed to science by people whose intelligence had been carefully measured before death, gave Witelson a solid set of benchmarks against which to measure the seat of Einstein's brilliant thoughts.Not only was Einstein's inferior parietal region unusually bulky the scientists found,but a feature called the Sylvian fissure was much smaller than average.Without this groove that normally slices through the tissue,the brain cells were packed close together,permitting more interconnections一which in principle can permit more cross-referencing of information and idea, leading to great leaps of insight.4.That's the idea,anyway.But while it's quite plausible according to current neurological theory,that doesn't necessarily,make it true.We know Einstein was a genius,and we now know that his brain was physically different from the average.But none of this proves a cause-and-effect relationship."What you really need,"says McLean's Benes,"is to look at the brains of a number of mathematical geniuses to see if the same abnormalities are present."5.Even if they are,it's possible that the bulked一up brains are a result of strenuous mental exercise,not an inherent feature that makes genius possible.Bottom line:we still don't know whether Einstein was born with an extraordinary mind or whether he earned it,one brilliant idea at a time.The structure of brain________.A:that doesn't necessarily make it trueB:the cells of mathematicsC:was born with an extraordinary mind or he earned itD:allow the cells work together more effectivelyE:is the same as the averages in size and weight
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Albert Einstein's Brain1.It doesn't take an Einstein to recognize that Albert Einstein's brain was very different from yours and mine.The gray matter housed inside that shaggy head managed to revolutionize our concepts of time,space,motion一the very foundations of physical reality一not just once but several times during his astonishing career. Yet while there clearly had to be something remarkable about Einstein's brain,the pathologist who removed it from the great physicist's skull after his death reported that the organ was,to all appearances,well within the normal range一no bigger or heavier than anyone else's.2.But a new analysis of Einstein's brain by Canadian scientists,reported in the current Lancet, reveals that it has some distinctive physical characteristics after all. A portion of the brain that governs mathematical ability and spatial reasoning一two key ingredients to the sort of thinking Einstein did best一was significantly larger than average and may also have had more interconnections among its cells,which could have allowed them to work together more effectively.3.In 1996,Harvey gave much of his data and a significant fraction of the tissue itself to Dr. Sandra Witelson,a neuroscientist who maintains a"brain bank"at McMaster for comparative studies of brain structure and function.These normal,undiseased brains,willed to science by people whose intelligence had been carefully measured before death, gave Witelson a solid set of benchmarks against which to measure the seat of Einstein's brilliant thoughts.Not only was Einstein's inferior parietal region unusually bulky the scientists found,but a feature called the Sylvian fissure was much smaller than average.Without this groove that normally slices through the tissue,the brain cells were packed close together,permitting more interconnections一which in principle can permit more cross-referencing of information and idea, leading to great leaps of insight.4.That's the idea,anyway.But while it's quite plausible according to current neurological theory,that doesn't necessarily,make it true.We know Einstein was a genius,and we now know that his brain was physically different from the average.But none of this proves a cause-and-effect relationship."What you really need,"says McLean's Benes,"is to look at the brains of a number of mathematical geniuses to see if the same abnormalities are present."5.Even if they are,it's possible that the bulked一up brains are a result of strenuous mental exercise,not an inherent feature that makes genius possible.Bottom line:we still don't know whether Einstein was born with an extraordinary mind or whether he earned it,one brilliant idea at a time.We don't know whether Einstein________.A:that doesn't necessarily make it trueB:the cells of mathematicsC:was born with an extraordinary mind or he earned itD:allow the cells work together more effectivelyE:is the same as the averages in size and weight
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Albert Einstein's Brain1.It doesn't take an Einstein to recognize that Albert Einstein's brain was very different from yours and mine.The gray matter housed inside that shaggy head managed to revolutionize our concepts of time,space,motion一the very foundations of physical reality一not just once but several times during his astonishing career. Yet while there clearly had to be something remarkable about Einstein's brain,the pathologist who removed it from the great physicist's skull after his death reported that the organ was,to all appearances,well within the normal range一no bigger or heavier than anyone else's.2.But a new analysis of Einstein's brain by Canadian scientists,reported in the current Lancet, reveals that it has some distinctive physical characteristics after all. A portion of the brain that governs mathematical ability and spatial reasoning一two key ingredients to the sort of thinking Einstein did best一was significantly larger than average and may also have had more interconnections among its cells,which could have allowed them to work together more effectively.3.In 1996,Harvey gave much of his data and a significant fraction of the tissue itself to Dr. Sandra Witelson,a neuroscientist who maintains a"brain bank"at McMaster for comparative studies of brain structure and function.These normal,undiseased brains,willed to science by people whose intelligence had been carefully measured before death, gave Witelson a solid set of benchmarks against which to measure the seat of Einstein's brilliant thoughts.Not only was Einstein's inferior parietal region unusually bulky the scientists found,but a feature called the Sylvian fissure was much smaller than average.Without this groove that normally slices through the tissue,the brain cells were packed close together,permitting more interconnections一which in principle can permit more cross-referencing of information and idea, leading to great leaps of insight.4.That's the idea,anyway.But while it's quite plausible according to current neurological theory,that doesn't necessarily,make it true.We know Einstein was a genius,and we now know that his brain was physically different from the average.But none of this proves a cause-and-effect relationship."What you really need,"says McLean's Benes,"is to look at the brains of a number of mathematical geniuses to see if the same abnormalities are present."5.Even if they are,it's possible that the bulked一up brains are a result of strenuous mental exercise,not an inherent feature that makes genius possible.Bottom line:we still don't know whether Einstein was born with an extraordinary mind or whether he earned it,one brilliant idea at a time.Paragraph 3________A:The InformationB:The Different in StructureC:The ConclusionD:The Research in Einstein's BrainE:Normal Brain in Size and Weight
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Albert Einstein's Brain1.It doesn't take an Einstein to recognize that Albert Einstein's brain was very different from yours and mine.The gray matter housed inside that shaggy head managed to revolutionize our concepts of time,space,motion一the very foundations of physical reality一not just once but several times during his astonishing career. Yet while there clearly had to be something remarkable about Einstein's brain,the pathologist who removed it from the great physicist's skull after his death reported that the organ was,to all appearances,well within the normal range一no bigger or heavier than anyone else's.2.But a new analysis of Einstein's brain by Canadian scientists,reported in the current Lancet, reveals that it has some distinctive physical characteristics after all. A portion of the brain that governs mathematical ability and spatial reasoning一two key ingredients to the sort of thinking Einstein did best一was significantly larger than average and may also have had more interconnections among its cells,which could have allowed them to work together more effectively.3.In 1996,Harvey gave much of his data and a significant fraction of the tissue itself to Dr. Sandra Witelson,a neuroscientist who maintains a"brain bank"at McMaster for comparative studies of brain structure and function.These normal,undiseased brains,willed to science by people whose intelligence had been carefully measured before death, gave Witelson a solid set of benchmarks against which to measure the seat of Einstein's brilliant thoughts.Not only was Einstein's inferior parietal region unusually bulky the scientists found,but a feature called the Sylvian fissure was much smaller than average.Without this groove that normally slices through the tissue,the brain cells were packed close together,permitting more interconnections一which in principle can permit more cross-referencing of information and idea, leading to great leaps of insight.4.That's the idea,anyway.But while it's quite plausible according to current neurological theory,that doesn't necessarily,make it true.We know Einstein was a genius,and we now know that his brain was physically different from the average.But none of this proves a cause-and-effect relationship."What you really need,"says McLean's Benes,"is to look at the brains of a number of mathematical geniuses to see if the same abnormalities are present."5.Even if they are,it's possible that the bulked一up brains are a result of strenuous mental exercise,not an inherent feature that makes genius possible.Bottom line:we still don't know whether Einstein was born with an extraordinary mind or whether he earned it,one brilliant idea at a time.Einstein's brain________.A:that doesn't necessarily make it trueB:the cells of mathematicsC:was born with an extraordinary mind or he earned itD:allow the cells work together more effectivelyE:is the same as the averages in size and weight
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Renewable Energy SourcesToday petroleum（石油）provides around 40% of the world's energy needs, mostly fuelling automobiles .Coal is still used,mostly in power stations,to cover one-quarter of our energy needs, but it is the least efficient, unhealthiest and most environmentally damaging fossil fuel（矿物燃料）.Natural gas reserves could fill some of the gap from oil,but reserves of that will not last into the 22nd century either. Most experts predict we will exhaust easily accessible reserves within 50 years. Less-polluting renewable energy sources offer a more practical long-term energy solution. "Renewable"refers to the fact that these resources are not used faster than they can be replaced.Hydroelectric（水力发电的）power is now the most common form of renewable energy , supplying around 20% of world electricity.China's Three Gorges Dam is the largest ever. At five times the size of the U. S. 's Hoover Dam,its 26 turbines (涡轮机）will generate the equivalent energy of 18 coal-fired power stations. It will satisfy 3%of China's entire electricity demand.In 2003,the first commercial power station to use tidal（潮汐的）currents in the open sea opened in Norway. It is designed like windmill（风车）,but others take the form of turbines.As prices fall,wind power has become the fastest growing type of electricity generation-quadrupling（翻两番）worldwide between 1 999 and 2005 . Modern wind farms consist of turbines that generate electricity. Though it will be more expensive,there is more than enough wind to provide the world's entire energy needs.Wind farms come in onshore and offshore forms. They can often end up at spots of natural beauty,and are often unpopular with residents. And turbines are not totally harmless-they can interfere with radar,alter climate and kill sea birds.Scotland is building Europe's largest wind farm,which will power 200 ,000 homes. The U.K. 's goal is to generate one-fifth of power from renewable sources,mainly wind,by 2020 .But this may cause problems, because wind is unreliable. According to the passage,which of the following is the most polluting energy resource?A: Petroleum.B: Coal.C: Natural gas.D: Water.
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It is widely accepted that English is the global language of modern times.
About three decades ago,French was recognized as the language of diplomacy（外交）,and German was considered the language of science and technology.English now dominates（主导）not only as the language of science but also diplomacy,computing,and tourism.Today,in terms of native speakers,Mandarin Chinese is the world′s
largest language.
Yet there are people who believe that China will become the most powerful country in the world.Some have?even fixed the date as early as the year 2020.At present,while English is more widely spoken than any other?language,there are more people who speak Chinese than English due to the large population in China alone.If China?does become a world power,there is no doubt that this language will spread worldwide.
As the controversy over which language will become dominant in the world continues,there are many who feel?that the dominance of English is unique and irreversible（不可逆的）.However,a separate study from David Graddol′s suggests that English′s dominance in the scientific area will continue.There is also an argument that the?English language would be changed greatly by 2020 for various reasons.With the possibility of China rising as a?world power,Mandarin could definitely challenge the dominance of English as a global language.
The author says that Chinese is expected to spread worldwide if__________.A.China becomes a real world power
B.China has a larger population
C.China has the modern technology
D.more tourists come to China
考题
A laptop operates on battery power when connected with an AC adapter. Once the battery discharges, the computer turns off and will not turn back on. Which of the following are the MOST likely causes of the laptop issue? （）(Select TWO).A、The LCD monitor’s power inverter does not function properly.B、The operating system’s power settings prevent the battery from charging.C、The battery is not compatible with the laptop.D、The internal power connection on the motherboard is faulty.E、The power adapter is not working.
考题
The technician has replaced a power supply with an identical power supply, and now the high end graphics card is not working. Which of the following should the technician check?（）A、The memoryB、The CMOS batteryC、The PCIe power jackD、The processor for chip creep
考题
单选题By calling it “tap-dancing to work”, Warren Buffett thinks the author’s job is _____A
a great challenge to brain power.B
significant in the development of technology.C
enjoyable in spite of any possible hardships.D
a window through which people are shown a new world.
考题
单选题The technician has replaced a power supply with an identical power supply, and now the high end graphics card is not working. Which of the following should the technician check?（）A
The memoryB
The CMOS batteryC
The PCIe power jackD
The processor for chip creep
考题
单选题When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is （）A
laggingB
leadingC
maximumD
minimum
考题
单选题When current and voltage reach maximum values at the same time, the power factor is（）A
minimumB
maximumC
leadingD
lagging
考题
单选题The Owners to take over and pay all fuel remaining in the Vessel’s bunkers on re-delivery at current price at the port of redelivery，or at the nearest main bunkering port，if the bunker price at the port of redelivery is not available. This indicates that the Owners are to take over and pay the remaining bunkers（）.A
at current price at the nearest main bunkering portB
at current price at the port of redelivery if it is not available to obtain the current price at the nearest main bunkering portC
at current price at the nearest main bunkering port if it is cheaper than that at the port of redeliveryD
at current price at the port of redelivery if it is obtainable，even the price is higher at the nearest main bunkering port
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