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The ideal battery will store a lot of energy in a small package.Right now,Belcher's model battery,a metallic disk completely built by viruses,looks like a regular watch battery. But inside,its components are very small-so tiny you can only see them with a powerful microscope.

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Which of the following is true of Belcher's battery mentioned in paragraph 6？

A.It is made of metal.

B.It is a kind of watch battery.

C.It can only be seen with a microscope.

D.It is a metallic disk with viruses inside it.

【正确答案】D

【答案解析】做题步骤：四个选项逐一带到原文，找到三个错误选项，一个正确选项，比NOT TRUE题难。

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