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A．Classmates.
B．Friends.
C．Lawyer and client.
D．Lifesaver and drowned victim.
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单项选择题
A．The use of insecticides should be limited and controlled.B．A combination of some insecticides should be used at the same time.C．New insects should be introduced to mate with those that have survived from a certain kind of insecticide.D．New kinds of insecticides should be explored and developed.
A．The use of insecticides should be limited and controlled.
B．A combination of some insecticides should be used at the same time.
C．New insects should be introduced to mate with those that have survived from a certain kind of insecticide.
D．New kinds of insecticides should be explored and developed.
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