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    This speed is as sound. A.as ten times fast B.ten times so fast C.ten times as fast D.ten times faster 答案 C 【查看更多】

     

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    This speed is　　 　 as sound.

    A.as ten times fast　　　　　　　　　　　　 B.ten times so fast　　

    C.ten times as fast　　　　　　　　　　　　　 D.ten times faster

     

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    A NASA experimental jet, the X – 43A, flew at a world – record speed – 11, 260 kilometers an hour. This speed is         as sound.

    A．as ten times fast          B．ten times so fast   C．ten times as fast      D．ten times faster

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    A NASA experimental jet, the X-43A, flew at a world-record speed---11,260 kilometres an hour on November 17. This speed is ____ as that of sound.

    A. as ten times fast       B. ten times so fast

    C. ten times as fast       D. ten times faster

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    A NASA experimental jet, the X-43A, flew at a world-record speed－11 260 kilometers an hour on November 17．This speed is ________ as sound．

    [　　]
    A．

    as ten times fast

    B．

    ten times so fast

    C．

    ten times as fast

    D．

    ten times faster

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