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．rates
B．impacts
C．ratios
D．pulses
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单项选择题
The movie has a satisfying ending.
A．pleasing
B．sad
C．interesting
D．horrific
单项选择题
Data from Voyager Ⅱ have presented astronomers with a puzzle about why our outermost planet exists.
A．problem
B．mystery
C．question
D．point
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