单项选择题

It's known to all that light travels much more quickly than sound does（）

A. 所有知道的全部内容就是光跑的速度要比声音快得多。
B．所有的人都知道光跑的速度要远远快过声音跑的速度。
C．众所周知，光传播的速度比声音传播的速度快得多。
D．关于那种光所得知的内容就是比声音传播得要快。

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