◎ 题干
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.astentimesfastB.tentimessofastC.tentimesasfastD.tentimesfaster
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“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.astentimesfas…”主要考查了你对  【序数词】【小数】【分数】【量词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。