单项选择题

The author of the report is well ______ with the problems in the hospital because he has been working there for many years.

A．informed
B．acquainted
C．enlightened
D．advertised
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单项选择题
A guided missile consists basically of a warhead attached to a tube like body. A rocket or a jet engine may ______ the missile.
A．power
B．pull
C．compel
D．expel
单项选择题
From the cheers and shouts of ______, I guessed that she was winning the race.
A．stimulus
B．heartening
C．encouragement
D．urging
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