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    19、A NASA experimental jet, the X—43A, flied at a world—record speed—11,260 kilometers an hour on November 17. Its speed is         as sound.

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

    C．ten times as fast                   D．so fast ten times

    19、C

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    A NASA experimental jet, the X—43A, flied at a world—record speed—11,260 kilometers an hour on November 17. Its speed is         as sound.

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

    C．ten times as fast                   D．so fast ten times

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