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    精英家教网 > 初中英语 > 题目详情

    Light travels at about ________．


    1. A.
      300 000 kilometres a second
    2. B.
      a second 300 000 kilometres
    3. C.
      300 000 kilometres every second
    4. D.
      every second 300 000 kilometres
    C
    光以大约每秒30万公里的速度传播。
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