单项选择题

Gas does accumulate in the mines around here.

A．increase
B．spread
C．collect
D．grow
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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
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
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