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题目内容
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.
- Aunsuspected
- Binsignificant
- Cpalpable
- Dbenign
- Eunviable
A显示答案
以上解析由 考满分老师提供。