单项选择题

Scientists want to postpone the day when______.

A．all insects will be eliminated
B．all insecticides will be abandoned
C．super-bugs resistant to all poisons come out
D．scientists must invent new insecticides
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单项选择题
A．IfB．AlthoughC．WhereasD．Because
A．If
B．Although
C．Whereas
D．Because
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.
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