(单选题)

What makes the paper-based batteries different from other batteries?

A.They are mainly used to run smartphones.

B.They use bacteria to generate electricity.

C.They are used to decorate small devices.

D.They take a much shorter time to recharge.

参考答案：B

参考解析：

细节理解题。根据第二段第二句“They need no electrical outlet to recharge. They just need more bacteria, which can be found everywhere — including dirty water.”可知，他们不需要插座来充电。它们只是需要更多的细菌，这些细菌随处可见，包括脏水。所以A项、C项、D项错误。故选B。

知识点：

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