单项选择题

As an excellent shooter, Peter practiced aiming at both _______ and moving targets.

A．standing
B．stationary
C．still
D．stable
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单项选择题
The Washington Monument is a hollow shaft without a break _______ its surface except for the ti- ny entrance.
A．in
B．with
C．from
D．to
单项选择题
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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