it _to all that light travels faster than sound Ait _to all that light travels faster than soundA.is known B.is know C.know D.is said

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it _to all that light travels faster than sound Ait _to all that light travels faster than soundA.is known B.is know C.know D.is said
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it _to all that light travels faster than sound Ait _to all that light travels faster than soundA.is known B.is know C.know D.is said
it _to all that light travels faster than sound A
it _to all that light travels faster than sound
A.is known B.is know C.know D.is said

it _to all that light travels faster than sound Ait _to all that light travels faster than soundA.is known B.is know C.know D.is said
选C,强调客观的事实:光速比声速快是众所周知的