单项选择题

It is well known that knowledge is the ______condition for expansion of mind.

A．incompatible
B．incredible
C．indefinite
D．indispensable
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单项选择题
______ in government was exposed through the agency of the press.
A．Corruption
B．Cosmetic
C．Cottage
D．Costume
单项选择题
I hope all the precautions against air pollution, ______ suggested by the local government, will be seriously considered here.
A．while
B．since
C．after
D．as
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