单项选择题
The
principal
duty of the United Nations is to safeguard the pace of the world.
A．primary
B．prime
C．privileged
D．precedent
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单项选择题
One of the real services of the historical novel is not that it can be a substitute for history, but that it can be a(n) extension.
A．compliment
B．supplement
C．instrument
D．replacement
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单项选择题
It is reported that the worst pedestrian jam in this city occurs around this crossroads.
A．confession
B．congestion
C．digesfon
D．exhaustion
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