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【单选题】
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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