单选题
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
A
B
C
D
【正确答案】
A
【答案解析】
speed和velocity同义,意为“速度”;impulse:冲动、刺激、推动;ratio:比、比率;percentage:百分数、百分率。
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