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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