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
We shall take the treasure away to a safe place.
A．clean
B．pretty
C．distant
D．secure
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