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
Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning.
A．observed
B．preserved
C．monitored
D．nurtured
单项选择题
Peter was seen crying when he came out of the office. We can deduce that he must have been punished.
A．confer
B．refer
C．prefer
D．infer
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