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
Human facial expressions differ from those of animals in the degree to which they can be deliberately controlled and modified.()

A. sufficiently
B. noticeably
C. intentionally
D. absolutely
单项选择题
Two thirds of the sufferers of the disease were killed.()

A. patients
B. spreaders
C. fans
D. pioneers
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