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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单项选择题
His inability to learn foreign languages was a(n) obstacle to his career.
A．barrier
B．excess
C．carder
D．impulse
单项选择题
Through the discussion they gained an extraordinary insight into the complexity of women's emotions.
A．cleverness of
B．knowledge of
C．prediction of
D．perception of
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