单项选择题

Nerve signals may travel through nerve or muscle fibers at speeds as high as two hundred miles per hour.

A．velocities
B．impulses
C．ratios
D．atrocities
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单项选择题
Our plan is to allocate one member of staff to handle appointments.
A．assign
B．persuade
C．ask
D．order
单项选择题
In order to improve our standard of living, we have to accelerate production.
A．step up
B．decrease
C．stop
D．control
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