单项选择题

A．If
B．Although
C．Whereas
D．Because
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单项选择题
Which of the following is NOT included in the scientists’ suggestions
A．Farmers use less insecticides.
B．Farmers spray only where posts have actually been seen.
C．Farmers could use a combination of two or three insecticides at once.
D．Farmers shouldn’t try to attract insects onto the crops.
单项选择题
A．offB．downC．outD．alone
A．off
B．down
C．out
D．alone
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