单项选择题

What can be inferred from the passage

A．Insects are the most adaptable creatures.
B．Insects would be out of control if nothing were done about the current situation.
C．Insects will someday devour all plants on the Earth,
D．Insects have developed resistance to both botanical and artificial poisons rapidly.
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单项选择题
What conclusion can be drawn from the scientists' observation
A．Insects have developed some sort of resistance to man-made poisons.
B．Insects have been eating plants for about 250 million years.
C．Farmers sometimes use a combination of two or three insecticides at once.
D．New insects mate with insects which survived from a certain kind of insecticid
单项选择题
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 axe using the mechanisms against poisons produced by plants to deal with insecticides.
D．Because insects have been eating plants for many million years.
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