According to the first paragraph, when can we share our sweet drinks with our cell phones? What trouble did Minteer and Klotzba

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问题 According to the first paragraph, when can we share our sweet drinks with our cell phones?
What trouble did Minteer and Klotzbach have in their research?

选项 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.

答案A

解析 文章第三段的第一句是问题的答案。
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