单选题：What happens to those insects when not killed by the spray o

题目分类：理工类
题目类型：单选题
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题目内容：

What happens to those insects when not killed by the spray of insecticide? A．They may lose their ability to produce offspring.
B．They may have a higher ability to adapt to the environment.
C．They move to other fields free from insecticide.
D．They never eat again those plants containing insecticide.

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