题目内容

13．The weight of the moon is only about _____ of that of the earth．（　　）
A．one eightyB．one of eighty
C．one the eightiethD．one eightieth

分析 月球的重量只是地球重量的八分之一．

解答 答案是D．本题考查分数的表达；分数的表达规则：分子用基数词，分母用序数词，且序数词前不需要冠词；分子大于一，分母用复数；故选D．

点评 正确理解分数的表达方式，结合语境并分析选项做出选择．

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