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

    A．three-eighths      B．third-eighth        C．third-eighths       D．third-eight

     

    【答案】

    A

    【解析】

    试题分析：英语中一般用基数词表示分数的分子，用序数词表示分数的分母。当分子是一时，分数的分母用单数形式，在表示分数时，当分数的分子大于一时，分数的分母要用复数形式。由分数修饰的主语后面谓语动词的数，和被修饰主语的单复数保持一致。根据分析可知选项BCD结构有误，故选A。

    考点：分数表达

    点评：英语分数的表达规则比较固定，学习中应牢记这些基本规则。需注意的是，由分数修饰的主语后面谓语动词的数，和被修饰主语的单复数保持一致。

     

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