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
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
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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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