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 poi- sons 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
Which of the following is NOT included in the scientists'suggestions
A．Farmers should use less insecticides.
B．Farmers should use a combination of two or three insecticides at once.
C．At certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect.
D．Farmers should regularly spray crops as a precaution against problems that are caused by large numbers of pests.
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