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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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
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
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