例：…The new strategy involves fuel cells, which are devices that use chemical reactions to produce electrical currents. Researchers from St. Louis University used a type of protein called enzymes（酶）. In the cells of living things, including people, enzymes are what spark chemical reactions. To keep up with the pace that our bodies demand, our cells constantly produce new enzymes as the old ones break down.

　　Scientists had tried using enzymes in fuel cells before, but they had trouble keeping the electricity flowing. That's because, unlike the enzymes in our cells, the enzymes in fuel cells break down faster than they can be replaced.

　　To get around this problem, the St. Louis researchers invented molecules that wrap around an enzyme and protect it. Inside this molecular pocket, an enzyme can last for months instead of days.

　　Q: Researchers have molecules wrap around an enzyme in order to____.

　　A. make the enzymes in fuel cells break down slower

　　B. produce enough enzymes to break down

　　C. keep up with the pace that our bodies demand

　　D. keep the enzymes in fuel cells from breaking down

　　[分析]从第四段最后一句话"That's because, unlike the enzymes in our cells, the enzymes in fuels cells break down faster than they can be replaced"可知，其目的是使燃料电池中酶的分裂速度降低。答案为A。

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