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. percentage
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单项选择题
Practically all species of animals communicate either through sounds or through soundless codes.
A. Simultaneously
B. Almost
C. Absolutely
D. Basically
单项选择题
John is collaborating with Mary in writing a book.
A. cooperating
B. merging
C. combining
D. associating
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