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．acquainted
B．known
C．informed
D．accustomed
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Be sure not to _______ his help. Do it all by yourself.
A．account for
B．press for
C．call on
D．reckon on
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There is supposed to be a safety _______ which makes it impossible for trains to collide.
A．appliance
B．accessory
C．machine
D．mechanism
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