2. 外语
  3. Nerve signals may travel through nerve or muscle fibers at speeds as high as two hundred miles per hour.

Nerve signals may travel through nerve or muscle fibers at speeds as high as two hundred miles per hour.

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问题 Nerve signals may travel through nerve or muscle fibers at speeds as high as two hundred miles per hour.
选项 A、velocities
B、impulses
C、ratios
D、atrocities
答案A
解析 本句意思是“神经信号在神经及肌肉纤维里以每小时200公里的速度传递”。speed“速度”；velocity“速度，快速”。例如，The car was moving at such a velocity!那辆汽车的速度简直太快了!impulse“冲动”，如：He bought the house on an impulse．他一时冲动买下了这所房子。ratio“比率”，如：The ratio of schoolboys to schoolgirls is 2 to 1．男学生和女学生的比例是2比1。atrocities“暴行”，如：People were annoyed by his atrocity．他的暴行激怒了人们。只有选项A与speed含义相近。
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