2010年职称英语《理工类B级》考点精粹四(23)

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.