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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Many fine cooks insist on ingredients of the highest quality.
A. demand
B. rely on
C. prepare for
D. create
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I don't quite follow what she is saying.
A. observe
B. understand
C. explain
D. describe
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