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填空题
If the soil’s bacteria and other microorganisms are also eliminated, the rainforest is destroyed.____
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根据题干信息可以定位到D段“But if the soil’s bacteria and other microorganisms, which break down the nutrient-rich organic matter that tumbles to the dark forest floor, are also eliminated, the rainforest is destroyed.”，故匹配段落为D段。
根据题干信息可以定位到D段“But if the soil’s bacteria and other microorganisms, which break down the nutrient-rich organic matter that tumbles to the dark forest floor, are also eliminated, the rainforest is destroyed.”，故匹配段落为D段。
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The statement “it is all too monkey” (Last line, paragraph l) implies that ________.[A] monkeys are also outraged by slack rivals[B] resenting unfairness is also monkeys’ nature[C] monkeys, like humans, tend to be jealous of each other[D] no animals other than monkeys can develop such emotions
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Upon payment of the agreed sum, all of Buyer’s rights and obligations shall ().A、animanateB、illuminateC、eliminateD、terminate
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four countries in Europe. The establishment of an online store in Bangkok () the need for customers to pay high international shipping fees when they make orders on the Web site. The
company’s customers in Asia have responded positively to this development.
A.has eliminated
B.eliminate
C.will eliminate
D.eliminated
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第二篇Research by the University of Exeter has revealed that ants have a big impact on their local en-vironment as a result of their activity as"ecosystem engineers"and predators.The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment.Firstly,through moving of soil by nest building activity and by collecting food they affect the level of nutrients in the soil.This can indirectly impact the local populations of many animal groups, from decomposers to species much higher up the food chain.Secondly,they prey on a wide range of other animals,including larger prey which can be at-tacked by vast numbers of ant workers.Dirk Sanders,an author of the study from the university's Centre for Ecology and Conservation, said:"Ants are very effective predators which thrive in huge numbers.They're also very territorial and very aggressive,defending their resources and territory against other predators.All of this means they have a strong influence on their surrounding area.""In this research,we studied for the first time how big this impact is and the subtleties of it. What we found is that despite being predators,their presence can also lead to an increase in density and diversity of other animal groups.They genuinely play a key role in the local environment,haying a big influence on the grassland food web,"Sanders said.The study,carried out in Germany,studied the impact of the presence of different combinations and densities of black garden ants and common red ants,both species which can be found across Eurone.including in the UK.It found that a low density of ants in an area increased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers.At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.Dr Frank van Veen,another author on the study,said:"What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counteracting the positive influence via ecosystem engineering."Ants are important components of ecosystems not only because they constitute a great part of the animal biomass but also because they act as ecosystem engineers.Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obviously reduces its richness. However,it is not clear how such disturbance damages the maintenance of ant services to the ecosystem.Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms.What still remains unclear about ants,according to the last paragraph?A:What roles do ants play in the ecosystem in which they live?B:How do ants affect the animal diversity in a given ecosystem?C:How do human activities affect ants' influence on a given ecosystem?D:How do ants alter the physical and chemical environment?
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A Country's Standard of LivingThe"standard of living" of any country means the average person's share of the goods and services the country produces.A country's standard of living,________(51),depends first and ________(52)on its capacity to produce wealth."Wealth"in this sense is not money,for we do not live on money________( 53)on things that money can buy:"goods"such as food and clothing, and"services"such as transport and entertainment.A country's capacity to produce wealth depends upon many factors,most of_________(54) have an effect on one another. Wealth depends_________(55)a great extent upon a country's natural resources.Some regions of the world are well supplied with coal and minerals,and have fertile soil and a favorable climate;other regions possess none of them.Next to natural resources_________(56) the ability to turn them to use.Some countries are perhaps as well-off_________(57)the USA in natural resources,but suffered for many years from civil and external wars,and________(58)this and other reasons were________(59)to develop their resources.Sound and stable political conditions,and________(60)from foreign invasions, enable a country to develop its natural resources peacefully and steadily,and to produce more wealth than another country equally well favoured by nature but less well ordered.A country's standard of living does not only depend upon the wealth that is produced and consumed_________(61)its own borders,but also upon what is directly produced through international trade.________(62),Britain's wealth in foodstuffs and other agricultural products would be much less if she had to depend only on________(63)grown at home.Trade makes it possible for her surplus manufactured goods to be traded abroad for the agricultural products that would________(64)be lacking.A country's wealth is,therefore,much influenced by its manufacturing capacity, ______(65)that other countries can be found ready to accept its manufactures._________(62)A:In short B:On the other handC:As a result D:For example
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Ants Have Big Impact on Environment as“Ecosystem Engineers”Research by the University of Exeter has revealed that ants have a big impact on their local environment as a result of their activity as“ecosystem engineers”and predators. The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment.Firstly,through moving of soil by nest building activity and by collecting food they af-fect the level of nutrients in the soil. This can indirectly impact the local populations of many animal groups,from decomposers to species much higher up the food chain.Secondly,they prey on a wide range of other animals,including larger prey which can be attacked by vast numbers of ant workers.Dirk Sanders,an author of the study from the university's Centre for Ecology and Con-servation,said:“Ants are very effective predators which thrive in huge numbers. They're al-so very territorial and very aggressive,defending their resources and territory against other predators. All of this means they have a strong influence on their surrounding area.”“In this research,we studied for the first time how big this impact is and the subtleties of it. What we found is that despite being predators,their presence can also lead to an increase in density and diversity of other animal groups. They genuinely play a key role in the local environment,having a big influence on the grassland food web,”Sanders said.The study,carried out in Germany,studied the impact of the presence of different combinations and densities of black garden ants and common red ants,both species which can be found across Europe,including in the UK.It found that a low density of ants in an area increased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counteracting the positive influence via ecosystem engineering.”Ants are important components of ecosystems not only because they constitute a great part of the animal biomass but also because they act as ecosystem engineers. Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obviously reduces its richness. However,it is not clear how such disturbance damages the maintenance of ant services to the ecosystem. Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms.Why are ants compared to ecosystem engineers?A: Because they build their own nests.B: Because they collect food.C: Because their activity affects the environment.D: Because they are predators.
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Ants Have Big Impact on Environment as“Ecosystem Engineers”Research by the University of Exeter has revealed that ants have a big impact on their local environment as a result of their activity as“ecosystem engineers”and predators. The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment.Firstly,through moving of soil by nest building activity and by collecting food they af-fect the level of nutrients in the soil. This can indirectly impact the local populations of many animal groups,from decomposers to species much higher up the food chain.Secondly,they prey on a wide range of other animals,including larger prey which can be attacked by vast numbers of ant workers.Dirk Sanders,an author of the study from the university's Centre for Ecology and Con-servation,said:“Ants are very effective predators which thrive in huge numbers. They're al-so very territorial and very aggressive,defending their resources and territory against other predators. All of this means they have a strong influence on their surrounding area.”“In this research,we studied for the first time how big this impact is and the subtleties of it. What we found is that despite being predators,their presence can also lead to an increase in density and diversity of other animal groups. They genuinely play a key role in the local environment,having a big influence on the grassland food web,”Sanders said.The study,carried out in Germany,studied the impact of the presence of different combinations and densities of black garden ants and common red ants,both species which can be found across Europe,including in the UK.It found that a low density of ants in an area increased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counteracting the positive influence via ecosystem engineering.”Ants are important components of ecosystems not only because they constitute a great part of the animal biomass but also because they act as ecosystem engineers. Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obviously reduces its richness. However,it is not clear how such disturbance damages the maintenance of ant services to the ecosystem. Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms.What does paragraph 6 tell us?A: Ants bring about a negative influence to an area when their population is small.B: Ants bring about a positive influence to an area when their population is small.C: Ants'predation counteracts the positive influence they may have on an area.D: At higher density,ants produce a positive influence on an area.
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第二篇Research by the University of Exeter has revealed that ants have a big impact on their local en-vironment as a result of their activity as"ecosystem engineers"and predators.The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment.Firstly,through moving of soil by nest building activity and by collecting food they affect the level of nutrients in the soil.This can indirectly impact the local populations of many animal groups, from decomposers to species much higher up the food chain.Secondly,they prey on a wide range of other animals,including larger prey which can be at-tacked by vast numbers of ant workers.Dirk Sanders,an author of the study from the university's Centre for Ecology and Conservation, said:"Ants are very effective predators which thrive in huge numbers.They're also very territorial and very aggressive,defending their resources and territory against other predators.All of this means they have a strong influence on their surrounding area.""In this research,we studied for the first time how big this impact is and the subtleties of it. What we found is that despite being predators,their presence can also lead to an increase in density and diversity of other animal groups.They genuinely play a key role in the local environment,haying a big influence on the grassland food web,"Sanders said.The study,carried out in Germany,studied the impact of the presence of different combinations and densities of black garden ants and common red ants,both species which can be found across Eurone.including in the UK.It found that a low density of ants in an area increased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers.At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.Dr Frank van Veen,another author on the study,said:"What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counteracting the positive influence via ecosystem engineering."Ants are important components of ecosystems not only because they constitute a great part of the animal biomass but also because they act as ecosystem engineers.Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obviously reduces its richness. However,it is not clear how such disturbance damages the maintenance of ant services to the ecosystem.Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms.Dir Sanders' study centered on how ants_________.A:can manage to thrive in huge numbersB:defend their resources and territory against other predatorsC:attack those invading animals for survivalD:produce such a big impact on the environment
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Ants Have Big Impact on Environment as“Ecosystem Engineers”Research by the University of Exeter has revealed that ants have a big impact on their local environment as a result of their activity as“ecosystem engineers”and predators. The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment.Firstly,through moving of soil by nest building activity and by collecting food they af-fect the level of nutrients in the soil. This can indirectly impact the local populations of many animal groups,from decomposers to species much higher up the food chain.Secondly,they prey on a wide range of other animals,including larger prey which can be attacked by vast numbers of ant workers.Dirk Sanders,an author of the study from the university's Centre for Ecology and Con-servation,said:“Ants are very effective predators which thrive in huge numbers. They're al-so very territorial and very aggressive,defending their resources and territory against other predators. All of this means they have a strong influence on their surrounding area.”“In this research,we studied for the first time how big this impact is and the subtleties of it. What we found is that despite being predators,their presence can also lead to an increase in density and diversity of other animal groups. They genuinely play a key role in the local environment,having a big influence on the grassland food web,”Sanders said.The study,carried out in Germany,studied the impact of the presence of different combinations and densities of black garden ants and common red ants,both species which can be found across Europe,including in the UK.It found that a low density of ants in an area increased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counteracting the positive influence via ecosystem engineering.”Ants are important components of ecosystems not only because they constitute a great part of the animal biomass but also because they act as ecosystem engineers. Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obviously reduces its richness. However,it is not clear how such disturbance damages the maintenance of ant services to the ecosystem. Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms.Dirk Sanders'study centered on how ants______.A: can manage to thrive in huge numbersB: defend their resources and territory against other predatorsC: attack those invading animals for survivalD: produce such a big impact on the environment
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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.Which of the following about methane is not mentioned in the passage?A:Plants growing in soil release methane.B:Plants growing in water release methane.C:Soil microbes consume methane.D:Microbes in plants produce methane.
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U. S. Scientists Confirm Water on MarsNASA scientists said that Mars was covered once by vast lakes,flowing rivers and a Va-riety of other wet environments that had the potential to support life.Laboratory tests aboard NASA's Phoenix Mars Lander have identified water in a soil sample;the lander's robotic arm delivered the sample Wednesday to an instrument that iden-tifies vapors produced by the heating of samples.“We have water,”said William Boynton of the University of Arizona,lead scientist for ,the Thermal and Evolved-Gas Analyzer,or TEGA.“This is the first time Martian water has been touched and tasted.”The robotic arm is a critical part of the Phoenix Mars mission. It is needed to trench into the icy layers of northern polar Mars and deliver samples to instruments that will analyze what Mars is made of,what its water is like,and whether it is or has ever been a possible habitat for life.The soil sample came from a trench approximately 2 inches deep.When the robotic arm first reached that depth,it hit a hard layer of frozen soil.Two attempts to deliver samples of icy soil on days when fresh material was exposed were foiled when the samples became stuck inside the scoop.Most of the material in Wednesday's sample had been exposed to the air for two days,letting some of the water in the sample vaporize away and making the soil easier to handle.“Mars is giving us some surprises,”said Phoenix principal investigator Peter Smith of the University of Arizona.“We're excited because surprises are where discoveries come from. One surprise is how the soil is behaving. The ice-rich layers stick to the scoop when poised in the sun above the deck,different from what we expected,from all the Mars simulation tes-ting we've done so far.”Since landing on May 25,Phoenix has been studying soil with a chemistry lab,TEGA, a microscope,a conductivity probe and cameras.The science team is trying to determine whether the water ice ever thaws enough to be available for biology and if carbon-containing chemicals and other raw materials for life are present.The mission is examining the sky as well as the ground. A Canadian instrument is using a laser beam to study dust and clouds overhead.“It's a 30-watt light bulb giving us a laser show on Mars,”said Victoria Hipkin of the Canadian Space Agency.A full-circle,color panorama of Phoenix's surroundings also has been completed by the spacecraft.“The details and patterns we see in the ground show an ice-dominated terrain as far as the eye can see,”said Mark Lemmon of Texas A & M University,lead scientist forPhoenix's Surface Stereo Imager camera.“They help us plan measurements we're making within reach of the robotic arm and interpret those measurements on a wider scale.”What was discovered by NASA's Phoenix Mars Lander on Mars?A: Vast lakes. B: Flowing rivers.C: Water in a soil sample. D: Living things.
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U. S. Scientists Confirm Water on MarsNASA scientists said that Mars was covered once by vast lakes,flowing rivers and a Va-riety of other wet environments that had the potential to support life.Laboratory tests aboard NASA's Phoenix Mars Lander have identified water in a soil sample;the lander's robotic arm delivered the sample Wednesday to an instrument that iden-tifies vapors produced by the heating of samples.“We have water,”said William Boynton of the University of Arizona,lead scientist for ,the Thermal and Evolved-Gas Analyzer,or TEGA.“This is the first time Martian water has been touched and tasted.”The robotic arm is a critical part of the Phoenix Mars mission. It is needed to trench into the icy layers of northern polar Mars and deliver samples to instruments that will analyze what Mars is made of,what its water is like,and whether it is or has ever been a possible habitat for life.The soil sample came from a trench approximately 2 inches deep.When the robotic arm first reached that depth,it hit a hard layer of frozen soil.Two attempts to deliver samples of icy soil on days when fresh material was exposed were foiled when the samples became stuck inside the scoop.Most of the material in Wednesday's sample had been exposed to the air for two days,letting some of the water in the sample vaporize away and making the soil easier to handle.“Mars is giving us some surprises,”said Phoenix principal investigator Peter Smith of the University of Arizona.“We're excited because surprises are where discoveries come from. One surprise is how the soil is behaving. The ice-rich layers stick to the scoop when poised in the sun above the deck,different from what we expected,from all the Mars simulation tes-ting we've done so far.”Since landing on May 25,Phoenix has been studying soil with a chemistry lab,TEGA, a microscope,a conductivity probe and cameras.The science team is trying to determine whether the water ice ever thaws enough to be available for biology and if carbon-containing chemicals and other raw materials for life are present.The mission is examining the sky as well as the ground. A Canadian instrument is using a laser beam to study dust and clouds overhead.“It's a 30-watt light bulb giving us a laser show on Mars,”said Victoria Hipkin of the Canadian Space Agency.A full-circle,color panorama of Phoenix's surroundings also has been completed by the spacecraft.“The details and patterns we see in the ground show an ice-dominated terrain as far as the eye can see,”said Mark Lemmon of Texas A & M University,lead scientist forPhoenix's Surface Stereo Imager camera.“They help us plan measurements we're making within reach of the robotic arm and interpret those measurements on a wider scale.”Which of the following do you think is the best description of Phoenix's Surface Ster-eo Imager Camera,according to your understanding of the passage?A:.It imitates human vision and is able to capture three-dimensional images.B: It imitates human voice and is able to record slight sounds while taking photos.C: It takes clear photos that show every detail of the object.D: It is this particular type of camera that can take wide angle pictures.
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第三篇Ants Have Big Impact on Environment as " Ecosystem Engineers"Research by the University of Exeter has revealed that ants have a big impact on their local environment as a result of their activity as"ecosystem engineers"and predators.The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment?Firstly.throuah moving the soil by nest building activity and by collecting food they affect the level ofnutrients in the soil.This can indirectly impact the local populations of many animal groups,from decomposers to species much higher up the food chain.Secondly,they prey on a wide range of other animals,including larger prey which can be attacked by vast numbers of ant workers.Dirk Sanders,an author of the study from the university's Centre for Ecology and Conservation,said, "Ants are very effective predators which thrive in huge numbers.They're also very territorial and very ag- gressive,defending their resources and territory against other predators.All of this means they have a strong influence on their surrounding area.""In this research,we studied for the first time how big this impact is and the subtleties of it.What we found is that despite being predators,their presence can also lead to an increase in density and diversity of other animal groups.They genuinely play a key role in the local environment,having a big influence on the grassland food web,"Sanders said.The study,carried out in Germany,studied the impact of the presence of different combinations and den- sities of black garden ants and common red ants,both of which can be found across Europe,including the UK. It found that a low density of ants in an area increased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers.At higher densities ants had no or the op-posite effect,the predation counteracting the positive influence.Dr Frank van Veen,another author on the study,said:"What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counteracting the positive influence via ecosystemengineering.Ants are important components of the ecosystem not only because they constitute a great part of the ani--mal biomass but also because they act as ecosystem engineers.Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obviously reduces its richness.However,it is not clear how such disturbance damages the maintenance of ant services to the ecosystem.Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms.What does Paragraph 6 tell us?A:Ants bring about a negative influence to an area when their population is small.B:Ants bring about a positive influence to an area when their population is small.C:Ants'predation counteracts the positive influence they may have on an area.D:At higher density,ants produce a positive influence on an area.
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U. S. Scientists Confirm Water on MarsNASA scientists said that Mars was covered once by vast lakes,flowing rivers and a Va-riety of other wet environments that had the potential to support life.Laboratory tests aboard NASA's Phoenix Mars Lander have identified water in a soil sample;the lander's robotic arm delivered the sample Wednesday to an instrument that iden-tifies vapors produced by the heating of samples.“We have water,”said William Boynton of the University of Arizona,lead scientist for ,the Thermal and Evolved-Gas Analyzer,or TEGA.“This is the first time Martian water has been touched and tasted.”The robotic arm is a critical part of the Phoenix Mars mission. It is needed to trench into the icy layers of northern polar Mars and deliver samples to instruments that will analyze what Mars is made of,what its water is like,and whether it is or has ever been a possible habitat for life.The soil sample came from a trench approximately 2 inches deep.When the robotic arm first reached that depth,it hit a hard layer of frozen soil.Two attempts to deliver samples of icy soil on days when fresh material was exposed were foiled when the samples became stuck inside the scoop.Most of the material in Wednesday's sample had been exposed to the air for two days,letting some of the water in the sample vaporize away and making the soil easier to handle.“Mars is giving us some surprises,”said Phoenix principal investigator Peter Smith of the University of Arizona.“We're excited because surprises are where discoveries come from. One surprise is how the soil is behaving. The ice-rich layers stick to the scoop when poised in the sun above the deck,different from what we expected,from all the Mars simulation tes-ting we've done so far.”Since landing on May 25,Phoenix has been studying soil with a chemistry lab,TEGA, a microscope,a conductivity probe and cameras.The science team is trying to determine whether the water ice ever thaws enough to be available for biology and if carbon-containing chemicals and other raw materials for life are present.The mission is examining the sky as well as the ground. A Canadian instrument is using a laser beam to study dust and clouds overhead.“It's a 30-watt light bulb giving us a laser show on Mars,”said Victoria Hipkin of the Canadian Space Agency.A full-circle,color panorama of Phoenix's surroundings also has been completed by the spacecraft.“The details and patterns we see in the ground show an ice-dominated terrain as far as the eye can see,”said Mark Lemmon of Texas A & M University,lead scientist forPhoenix's Surface Stereo Imager camera.“They help us plan measurements we're making within reach of the robotic arm and interpret those measurements on a wider scale.”Where are the scientists involved in the research from?A: They are from America.B: They are from Canada.C: They are from both America and Canada.D: They are from neither America nor Canada.
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U. S. Scientists Confirm Water on MarsNASA scientists said that Mars was covered once by vast lakes,flowing rivers and a Va-riety of other wet environments that had the potential to support life.Laboratory tests aboard NASA's Phoenix Mars Lander have identified water in a soil sample;the lander's robotic arm delivered the sample Wednesday to an instrument that iden-tifies vapors produced by the heating of samples.“We have water,”said William Boynton of the University of Arizona,lead scientist for ,the Thermal and Evolved-Gas Analyzer,or TEGA.“This is the first time Martian water has been touched and tasted.”The robotic arm is a critical part of the Phoenix Mars mission. It is needed to trench into the icy layers of northern polar Mars and deliver samples to instruments that will analyze what Mars is made of,what its water is like,and whether it is or has ever been a possible habitat for life.The soil sample came from a trench approximately 2 inches deep.When the robotic arm first reached that depth,it hit a hard layer of frozen soil.Two attempts to deliver samples of icy soil on days when fresh material was exposed were foiled when the samples became stuck inside the scoop.Most of the material in Wednesday's sample had been exposed to the air for two days,letting some of the water in the sample vaporize away and making the soil easier to handle.“Mars is giving us some surprises,”said Phoenix principal investigator Peter Smith of the University of Arizona.“We're excited because surprises are where discoveries come from. One surprise is how the soil is behaving. The ice-rich layers stick to the scoop when poised in the sun above the deck,different from what we expected,from all the Mars simulation tes-ting we've done so far.”Since landing on May 25,Phoenix has been studying soil with a chemistry lab,TEGA, a microscope,a conductivity probe and cameras.The science team is trying to determine whether the water ice ever thaws enough to be available for biology and if carbon-containing chemicals and other raw materials for life are present.The mission is examining the sky as well as the ground. A Canadian instrument is using a laser beam to study dust and clouds overhead.“It's a 30-watt light bulb giving us a laser show on Mars,”said Victoria Hipkin of the Canadian Space Agency.A full-circle,color panorama of Phoenix's surroundings also has been completed by the spacecraft.“The details and patterns we see in the ground show an ice-dominated terrain as far as the eye can see,”said Mark Lemmon of Texas A & M University,lead scientist forPhoenix's Surface Stereo Imager camera.“They help us plan measurements we're making within reach of the robotic arm and interpret those measurements on a wider scale.”Which one of the following statements is NOT meant by the writer?A: Scientists have been trying to break the ice-rich layers of soil on Mars.B: Scientists have been surprised by how the soil on Mars behaves.C: Scientists have been trying to find out if there is life supporting material on Mars.D: Scientists have been trying to know if water ice will melt.
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第一篇Food PoisoningFood sometimes gets poisoned with harmful things,A person who eats such food can get an illness called food poisoning. Food poisoning is usually not serious,but some types are deadly.The symptoms of food poi- soning usually begin within hours of eating the poisoned food.Fever is one of the most common symptoms.Certain microorganisms（微生物）cause most types of food poisoning. Bacteria and other microorganisms can poison eggs,meat,vegetables,and many other foods.After entering the body,these tiny living things re- lease（释放）poisons that make people sick.Some chemicals can also cause food poisoning. They are often added to food while it is being grown,pro- cessed,or prepared.For example,many farmers spray chemicals on crops to kill weeds and insects.Some people may have a bad reaction to those chemical、when they eat the crops.Some plants and animals contain natural poisons that are harmful to people.These includo certain kinds of seafood,grains,nuts,seeds,beans,and mushrooms.When people handle food properly,the risk of food poisoning is very small.Microorganisms multiply rapidly in dirty places and in warm temperatures.This means that people should never touch food with dirty hands or put food on unwashed surfaces.Food should be kept in a refrigerator to stop microorganisms from growing, Meat needs to be cooked thoroughly to kill any dangerous microorganisms. People should also wash food covered with chemicals before eating it.Finally,people should not eat wild mushrooms or other foods that grow in the wild.Some of these foods may contain natural materials that are poisonous to humans.In addition,some types of fish can be poisonous.Most people recover from food poisoning after a few days of resting and drinking extra water. If people eat natural poisons,they must go to the hospital right away to have their stomachs emptied. From Paragraph 5,we can learn that_______________.A:mushrooms should not he eatenB:vegetables are safer than meat and seafoodC:natural poisons are more dangerous than chemicalsD:different types of food should he handled differently
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共用题干
第一篇Food PoisoningFood sometimes gets poisoned with harmful things,A person who eats such food can get an illness called food poisoning. Food poisoning is usually not serious,but some types are deadly.The symptoms of food poi- soning usually begin within hours of eating the poisoned food.Fever is one of the most common symptoms.Certain microorganisms（微生物）cause most types of food poisoning. Bacteria and other microorganisms can poison eggs,meat,vegetables,and many other foods.After entering the body,these tiny living things re- lease（释放）poisons that make people sick.Some chemicals can also cause food poisoning. They are often added to food while it is being grown,pro- cessed,or prepared.For example,many farmers spray chemicals on crops to kill weeds and insects.Some people may have a bad reaction to those chemical、when they eat the crops.Some plants and animals contain natural poisons that are harmful to people.These includo certain kinds of seafood,grains,nuts,seeds,beans,and mushrooms.When people handle food properly,the risk of food poisoning is very small.Microorganisms multiply rapidly in dirty places and in warm temperatures.This means that people should never touch food with dirty hands or put food on unwashed surfaces.Food should be kept in a refrigerator to stop microorganisms from growing, Meat needs to be cooked thoroughly to kill any dangerous microorganisms. People should also wash food covered with chemicals before eating it.Finally,people should not eat wild mushrooms or other foods that grow in the wild.Some of these foods may contain natural materials that are poisonous to humans.In addition,some types of fish can be poisonous.Most people recover from food poisoning after a few days of resting and drinking extra water. If people eat natural poisons,they must go to the hospital right away to have their stomachs emptied. A:are always accompanied by a fever B:are too common to be notedC:can be noticed within hoursD:can he ignored
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We believe that sales will increase soon; （）, production costs will be going up also.AsoBthusCon the other handDhowever
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How do objects pass messages in Java？（） A、They pass messages by modifying each other’s member variablesB、They pass messages by modifying the static member variables of each other’s classesC、They pass messages by calling each other’s instance member methodsD、They pass messages by calling static member methods of each other’s classes.
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填空题If the soil’s bacteria and other microorganisms are also eliminated, the rainforest is destroyed.____
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问答题Modern means of transportation, telecommunication and mass media have shortened the geographical distance of the world. The international community appears to be no more than a global village, in which people of different nations engage themselves in cultural exchange, while seeking common development in harmonious and respectful relationship. I think different cultures should learn from each other’s strengths to offset their own weaknesses. However, we also have to understand that cultural exchange is by no means a process of losing one’s own culture to a foreign one, but a process of enriching each other’s national cultures. Of course, the culture of a nation must withhold its own distinctive national characteristics in its extensive exchange with other cultures, and make contributions to the development of human civilization.
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单选题The four basic components of a fire are fuel, heat, oxygen and a chain reactionWhich of the following statements best describes what must be eliminated to extinguish a fire?（）A
Any one component can be eliminated to extinguish a fireB
Any two components must be eliminated to properly extinguish a fireC
Any three components must be eliminated to properly extinguish a fireD
Ali four components must be eliminated to extinguish any fire
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填空题Around the turn of the century, there was a vast rainforest in Rwanda reduced its original size by deforestation and refugee resettlement.____
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填空题Reforesting the corridors of trees that lie between rainforest parcels provides an easy means to inhabit new territory and expand viable rainforest ecology.____
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单选题Many people are against the use of chemicals to preserve food because ______.A
chemicals are not necessary for preserving foodB
a small quantity of bacteria in food is good to peopleC
those chemicals that kill bacteria may not be good to peopleD
there are other better ways to preserve food
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单选题He’s very famous not only in Britain, but also in many other ______ in the world. He was born in 1812 and he lived in London.A
citiesB
countriesC
townsD
villages
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单选题Which of the following can be concluded from the author’s statement “Any beneficial substances from the turtles could also be synthesized chemically, so as to prevent the killing of turtles” in Paragraph 3 ?A
The author feels sorry for killing turtles massively.B
Turtles can be used to substitute many other medicines.C
Many other kinds of herbs can be as useful as turtles.D
International market feels happy for Chinese businessmen to buy.
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