单项选择题

The reason for their unusual behavior remains a puzzle.

A．fact
B．mystery
C．statement
D．game
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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
单项选择题
That guy is really witty.
A．smart
B．ugly
C．honorable
D．popular
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