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
I was shocked when I saw the size of the telephone bill．
A．excited
B．angry
C．lost
D．surprised
单项选择题
The use of the chemical may present a certain hazard to the laboratory workers.()

A. protection
B. indication
C. immunity
D. danger
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