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、rates
B、impacts
C、ratios
D、pulses
答案A
解析 本句意思：神经信号可以最高每小时200英里的速度通过神经或肌肉纤维。speed：速度，它和rate同义，表“速度”。ratio是常见词，意思为“比率”，例如：The ratio of 10 to 5 is 2:1．这句话的意思是“10与5之比是2比1”。pulse：脉搏，脉冲，如：The doctor took the woman’s pulse．医生给那个妇女号脉。impact：影响，冲击力，用法为to have/exert impact on something：对……产生影响。
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