单项选择题

In the country we are excluded from the worries of life in a big town.

A．enveloped
B．protected
C．insulated
D．subtracted
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单项选择题
Great works are performed not by strength but by persistence.
A．permanence
B．proliferation
C．perseverance
D．predominance
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．digestion
D．exhaustion
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