单项选择题

Humans should not develop their economy at the ______ of the ecological environment.

A．destruction
B．pollution
C．expense
D．mercy
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单项选择题
It is not too late, but ______ action is needed.
A．right
B．urgent
C．hurry
D．prompt
单项选择题
A good deal of the ______ for his achievement in this field must go to his supervisor, Professor Fang.
A．credit
B．reputation
C．respect
D．praise
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