概括大意与完成句子
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．
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。
