单项选择题

He had a clear______of what was wrong with the machine and fixed it in a short time.

A．debris
B．deficiency
C．perception
D．persecution
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单项选择题
She was______by the lack of appreciation shown of her hard work.
A．frustrated
B．dispersed
C．functioned
D．displaced
单项选择题
As the society has rigid social______, everyone knows his role in the society.
A．hemisphere
B．contempt
C．controversy
D．hierarchy
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