单项选择题

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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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
The guest turned upside down his glass as a signal that he would drink no more.
A．conversed
B．inversed
C．traversed
D．reversed
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