单项选择题

Chemistry is closely ______ with other studies, physics, biology and so on.

A．corresponded
B．concerned
C．correlated
D．cooperated
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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
单项选择题
It is not too late, but ______ action is needed.
A．right
B．urgent
C．hurry
D．prompt
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