D They had trouble finding mechanism for producing enzymes.
A when bags of enzyme are embedded in the new fuel cell.
C when the enzyme oxidizes the glucose from a sugary liquid that goes through a pocket.
4. What is exciting about the new fuel cells?
B Their limited power generation capacity is a good beginning.
D Their limitless power generation capacity is a major accomplishment,
A The new fuel cells run on sugar that is easy to find.
C The new fuel cells are biologically degradable,
答案与题解:
2. A 文章第三段的第一句是问题的答案。
4. B 第六段的大意是,尽管这种新型燃料电池还不能产牛很多电能,但是,它能够产生电能的事实就已经是很大的成就了。因而激动人心。所以只有B是正确答案。
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