单项选择题

He tried to ______ his nervousness.

A．cover for
B．cover on
C．cover up
D．cover in
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单项选择题
Today, housework has been made much easier by electrical ______.
A．facilities
B．appliances
C．instruments
D．equipment
单项选择题
His opinion was quite ______ so we had to give up persuading him.
A．clear
B．apparent
C．evident
D．obvious
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