閱讀下面的短文。每篇短文的后面有五個問題，每個問題有四個備選答案。請根據短文的內容選擇最佳答案。每個試題計3分,共計15分。

Using enzymes commonly found in living cells，a new type of fuel cell produces small amounts of electricity from sugar.If the technology is able to succeed in mass production，you may some day share your sweet drinks with your cell phone.

When researchers previously used enzymes in fuel cells，they had trouble keeping them active，says Shelley D.Minteer of St Louis University1.Whereas biological cells continually produce fresh enzymes，theres no mechanism in fuel cells to replace enzymes as they quickly degrade.

In the new fuel Cell，tiny polymer bags of enzyme are embedded in a membrane that coats one of the electrodes.When glucose from a sugary liquid gets into a pocket，the enzyme oxidizes it，releasing electrons and protons.The electrons cross the membrane and enter a wire through which they travel to the other electrode，where they react with.oxygen in the atmosphere to produce water.The flow of electrons through the wire constitutes an electrical current that can generate power.

Sugar-eating fuel cells could be an efficient way to make electricity.Sugar is easy to find. And the new fuel cells that run on it are biodegradable，so the technology wouldnt hurt the environment.The scientists are now trying to use different enzymes that will get more power from sugar.They predict that popular products may be using the new technology in as little as 3 years.

enzymen.酶 electroden.電極platinumn.鉑，白金 membranen.膜，薄膜

polymern.聚合物 biodegradableadj.能進行生物降解的

protonn.質子

1. According to the first paragraph，when can we share our sweet drinks with our cell phones?

B When the technology of producing a new type of fuel cell appears.

D When the technology of mass producing cell phones appears.

A They had trouble keeping enzymes in fuel cells active.

C They had trouble producing fresh enzymes.

3. According to Paragraph 5，electrons are released

B when glucose from a sugary liquid goes through the enzyme.

D when the enzyme oxidizes the sugary liquid that goes through a pocket.

A Their limitless power generation capacity is amazing.

C Their limited power generation capacity is the result of great efforts.

5. According to the last paragraph，what is NOT true of the new fuel cells?

B The new fuel cells are environment friendly.

D It will take some time before the new fuel cells can be used in popular products.

1. C A和D明顯不是正確答案。B不是正確選擇，因為只有當這種新的燃料電池被大規模生產時，才有可能實現用甜飲料給手機提供電能。

3. C 該段第二句When glucose from a sugary liquid penetrates a pocket，the enzyme oxidizes it，releasing electrons and proton中的it指代glucose，而不是a sugary liquid，因 此C是正確選擇。

5. D 文章的最后一段指出了這種新型燃料電池的優點，即A、B、C所述內容。最后一句說，科學家預計，在不到三年的時間里這種新技術便可在大眾的流行產品中使用。所以D是正確選擇。

閱讀下面的短文。每篇短文的后面有五個問題，每個問題有四個備選答案。請根據短文的內容選擇最佳答案。每個試題計3分,共計15分。

Using enzymes commonly found in living cells，a new type of fuel cell produces small amounts of electricity from sugar.If the technology is able to succeed in mass production，you may some day share your sweet drinks with your cell phone.

When researchers previously used enzymes in fuel cells，they had trouble keeping them active，says Shelley D.Minteer of St Louis University1.Whereas biological cells continually produce fresh enzymes，theres no mechanism in fuel cells to replace enzymes as they quickly degrade.

In the new fuel Cell，tiny polymer bags of enzyme are embedded in a membrane that coats one of the electrodes.When glucose from a sugary liquid gets into a pocket，the enzyme oxidizes it，releasing electrons and protons.The electrons cross the membrane and enter a wire through which they travel to the other electrode，where they react with.oxygen in the atmosphere to produce water.The flow of electrons through the wire constitutes an electrical current that can generate power.

Sugar-eating fuel cells could be an efficient way to make electricity.Sugar is easy to find. And the new fuel cells that run on it are biodegradable，so the technology wouldnt hurt the environment.The scientists are now trying to use different enzymes that will get more power from sugar.They predict that popular products may be using the new technology in as little as 3 years.

enzymen.酶 electroden.電極platinumn.鉑，白金 membranen.膜，薄膜

polymern.聚合物 biodegradableadj.能進行生物降解的

protonn.質子

1. According to the first paragraph，when can we share our sweet drinks with our cell phones?

B When the technology of producing a new type of fuel cell appears.

D When the technology of mass producing cell phones appears.

A They had trouble keeping enzymes in fuel cells active.

C They had trouble producing fresh enzymes.

3. According to Paragraph 5，electrons are released

B when glucose from a sugary liquid goes through the enzyme.

D when the enzyme oxidizes the sugary liquid that goes through a pocket.

A Their limitless power generation capacity is amazing.

C Their limited power generation capacity is the result of great efforts.

5. According to the last paragraph，what is NOT true of the new fuel cells?

B The new fuel cells are environment friendly.

D It will take some time before the new fuel cells can be used in popular products.

1. C A和D明顯不是正確答案。B不是正確選擇，因為只有當這種新的燃料電池被大規模生產時，才有可能實現用甜飲料給手機提供電能。

3. C 該段第二句When glucose from a sugary liquid penetrates a pocket，the enzyme oxidizes it，releasing electrons and proton中的it指代glucose，而不是a sugary liquid，因 此C是正確選擇。

5. D 文章的最后一段指出了這種新型燃料電池的優點，即A、B、C所述內容。最后一句說，科學家預計，在不到三年的時間里這種新技術便可在大眾的流行產品中使用。所以D是正確選擇。