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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单项选择题
At first I guessed it was an airplane, but I soon changed my mind because it remained static instead of moving like a plane.
A．stationary
B．statutory
C．stationery
D．statuesque
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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