单项选择题

He ______ the bushes around his house carefully with D.D.T. every evening.

A．scattered
B．spread
C．sprayed
D．distributed
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单项选择题
During the Ice Ages, man developed the use of tools, and thus a way of protecting himself against ______.
A．shortcomings
B．faults
C．mistakes
D．hazards
单项选择题
His influence over union members has ______ since his failure to strive higher wages for them.
A．destroyed
B．lowered
C．depressed
D．declined
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