单项选择题

The ships" generator broke down, and the pumps had to be operated ______ instead of mechanically.

A．manually
B．artificially
C．automatically
D．synthetically
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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．acknowledged
单项选择题
He ______ to his customers and halved the price.
A．leaked
B．drew
C．quoted
D．yielded
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