Sugar Power for Cell Phones
In fuel cells，chemical reactions generate electrical currents.The process usually relies on precious metals，such as platinum.In living cells，enzymes perform a similar job，breaking down sugars to obtain electrons and produce energy.
Minteer and Tamara Klotzbach，also of St Louis University，have now developed polymers that wrap around an enzyme and preserve it in a microscopic pocket.We tailor these pockets to provide the ideal microenvironment for the enzyme，Minteer says.The polymers keep the enzyme active for months instead of days.
So far，the new fuel cells dont produce much power，but the fact that they work at all is exciting，says Paul Kenis，a chemical engineer at the University of Illinois2 at Urhana-Champaign3.Just getting it to work. Kenis says，is a major accomplishment.
词汇：5enzaImI5lektrEJd5plAtinEm5membreinp
electronn.电子 oxidizev.氧化degradev.降解 glucosen.葡萄糖5pClimE7baiEudi5reidEblp
microenvironment n.微环境 embedv.埋置，插入5prEutCnp
试题
A When enzymes can be commonly found in living ceils.
C When the technology of a new type of fuel cell is suitable for mass production.
2. What trouble did Minteer and Klotzhach have in their research?
B They had trouble keeping biological cells active.
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。