单项选择题

His inability to learn foreign languages was a(n) obstacle to his career.

A．barrier
B．excess
C．carrier
D．impulse
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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
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
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