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题目内容
The insecticide proved (i) _____; by killing the weak adults of a species, it assured that the strong ones would mate among themselves and produce offspring still more (ii) _____ to its effects.
- Blank(i)
- cruel
- counterproductive
- indispensable
- Blank(ii)
- hostile
- vulnerable
- resistant
counterproductive , resistant 显示答案
以上解析由 考满分老师提供。