GRE Text Completion Question 729
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Source: Red
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) | Blank(ii) |
---|---|
A cruel | D hostile |
B counterproductive | E vulnerable |
C indispensable | F resistant |