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    The jet flew at a world-record speed---11,260 kilometers an hour on November 17.The speed is as sound. A. as ten times B. ten times so fast C. ten times as fast D. ten times faster 【查看更多】

     

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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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