单项选择题

My car is always breaking down, but I don't know enough about __________ to be able to fix it my self.

A．mechanics
B．mechanism
C．mechanic
D．medicine
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单项选择题
Instead of simply punishing them, the system encourages offenders to __________ their behavior.
A．modify
B．revise
C．convert
D．remedy
单项选择题
Setting off firecrackers is seen not merely as a (an) __________ lint also a big threat to man's life and property.
A．magnificence
B．interference
C．nuisance
D．appearance
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