单选题：根据以下资料，回答题。Batteries Built by Viruses According to the firs

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根据以下资料，回答题。
Batteries Built by Viruses


According to the first paragraph，people try to__________. A．kill microorganisms related to chicken pox，the flu，etc
B．keep themselves away from viruses because they are invisible
C．stay away from viruses because they are causes of various diseases
D．cure themselves of virus—related diseases by taking medicines

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靖在第_____处填上正确答案。

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（　　）with the picture. Mary tore it to pieces.

（　　）with the picture. Mary tore it to pieces.A．Dissatisfying thoroughly B．Being

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Mr. Smith advised us to withdraw （　　）.A．so that to get not involved B．so as to g

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Don’t forget to walk the dog while I am away, （　　）.A．can you B．shall you C．do yo

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That tree looked as if it （　　）for a long time.

That tree looked as if it （　　）for a long time.A．hasn’t watered B．didn’t water C．

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