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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They demand to set up an organization flexible enough to cope with any emergency.
A．portable
B．valiant
C．trivial
D．mobile
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His inability to learn foreign languages was a(n) obstacle to his career.
A．barrier
B．excess
C．carder
D．impulse
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