We can’t see in dirt with our eyes． We need a microscope to see germs because germs .

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问题 We can’t see ______ in dirt with our eyes．
We need a microscope to see germs because germs ______.

分析全文可知，C为最佳答案。

从第二段第五句“脏东西满是细菌但它们太小只能用显微镜来观察”可知，C为正确答案。

选项 A、move quickly
B、are very dirty
C、are very small

答案C

解析

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