PASSAGE FOUR What is this passage mainly about?

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问题 PASSAGE FOUR
What is this passage mainly about?

选项

答案The good microbes in the human body and their effect.

解析 本文主要讲述了人体中的有益菌,此外通过important and invited guests,providing us with a bonusenergy source和count on your friendly microbes等关键信息可知,文章还讲了这些有益菌在人体消化系统中所起的作用,故答案可概括为The good microbes in the human body and their effect。
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