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 speed：速度。与velocity(速度；快速)的意思相近。Scientists spent years studying the velocity of light．科学家们花了许多年研究光速。impulse：冲动。On impulse, I went into the shop and bought this expensive watch．在一时冲动下，我走进商店，买下了这块昂贵的手表。ratio：比；比率。The ratio of pupils to teachers is 30 to 1．学生与教师之间的比例是30比1。atrocity：暴行。They were guilty of the most barbarous and inhuman atrocities．他们犯有最野蛮、最不人道的暴行。
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