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Microorganisms are the oldest, the most numerous, and the most widespread life-forms, nevertheless, because they are invisible to the unaided eye, their existence was as ____________ as their impact has been profound.
- A.unsuspected
- B.insignificant
- C.palpable
- D.benign
- E.unviable
A显示答案
以上解析由 考满分老师提供。
