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    It is said that the gravity on Mars is only about __________ of the gravity on earth．

    A. three-eighthsB. third-eighth

    C. three-eighthD. third-eighth

     

    A

    【解析】

    试题分析：英语分数的表达是分子用基数词，分母用序数词，分子超过一，分母用复数。先排除B,D,故选A。句意为：据说火星的重力只有地球重力的八分之三。

    考点：考查分数。

     

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