单项选择题

If the fire alarm is sounded, all residents are requested to______ in the courtyard.

A．converge
B．assemble
C．crowd
D．accumulate
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单项选择题
The purpose of the new economic policy is not to hinder economic growth______ to guide it in a beneficial way.
A．and
B．as
C．but
D．nor
单项选择题
The scientist's discovery will have a______ influence on mankind.
A．prominent
B．promising
C．profound
D．productive
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