2. What trouble did Minteer and Klotzhach have in their research?

　　A They had trouble keeping enzymes in fuel cells active.

　　B They had trouble keeping biological cells active.

　　C They had trouble producing fresh enzymes.

　　D They had trouble finding mechanism for producing enzymes.

　　3. According to Paragraph 5，electrons are released

　　A when bags of enzyme are embedded in the new fuel cell.

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

　　C when the enzyme oxidizes the glucose from a sugary liquid that goes through a pocket.

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

　　4. What is exciting about the new fuel cells?

　　A Their limitless power generation capacity is amazing.

　　B Their limited power generation capacity is a good beginning.

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

　　D Their limitless power generation capacity is a major accomplishment，

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

　　A The new fuel cells run on sugar that is easy to find.

　　B The new fuel cells are environment friendly.

　　C The new fuel cells are biologically degradable，

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

　　答案與題解：

　　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。

　　2. A 文章第三段的第一句是問題的答案。

　　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。

　　4. B 第六段的大意是，盡管這種新型燃料電池還不能產牛很多電能，但是，它能夠產生電能的事實就已經是很大的成就了。因而激動人心。所以只有B是正確答案。

　　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。