单项选择题

There is a ______ of three men to one woman in this factory.

A．ratio
B．percentage
C．portion
D．rate
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单项选择题
That battle is of great significance when viewed in the ______ of the progress of the war.
A．view
B．perspective
C．opinion
D．idea
单项选择题
The boxer ______ his opponent as hard as he could.
A．punched
B．whipped
C．slapped
D．knocked
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