【阅读选择】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

【阅读选择】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．

正确答案是D