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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That guy is really witty.
A．smart
B．ugly
C．honorable
D．popular
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My parents wouldn't allow me to go to the party.
A．permit
B．encourage
C．advise
D．agree
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