PASSAGE FOUR [br] What can microorganisms be divided into according to the passa

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问题 PASSAGE FOUR [br] What can microorganisms be divided into according to the passage?

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答案 Beneficial ones and nasty ones.

解析第1段提到，对人体有益的细菌的数量远远大于有害细菌的数量，由此可知，细菌可以分为有益菌和有害菌，故答案为Beneficial ones and nasty ones。

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