题目内容
（请给出正确答案）
[主观题]
Why did the resistance of insects to man - made insecticides develop so rapidly？A．Because
Why did the resistance of insects to man - made insecticides develop so rapidly？
A．Because farmers use less insecticides now.
B．Because farmers have been using insecticides for many years.
C．Because insects are using the mechanisms against poisons produced by plants to. deal with insecticides.
D．Because insects have been eating plants for many million years.
答案
查看答案
