it ＿to all that light travels faster than sound A

分类: 作业答案 • 2023-01-20 15:15:33

问题描述：

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

答

选C,强调客观的事实：光速比声速快是众所周知的