Although thunder and lightning are produced at the same time, light waves travel faster________, so we see the lightning before we hear the thunder.

Câu hỏi :

Although thunder and lightning are produced at the same time, light waves travel faster________, so we see the lightning before we hear the thunder.

A. do sound waves

B. than sound waves are

C. than sound waves do

D. sound waves

* Đáp án

C

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