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．本題考查分?jǐn)?shù)的表達(dá)；分?jǐn)?shù)的表達(dá)規(guī)則：分子用基數(shù)詞，分母用序數(shù)詞，且序數(shù)詞前不需要冠詞；分子大于一，分母用復(fù)數(shù)；故選D．

點(diǎn)評 正確理解分?jǐn)?shù)的表達(dá)方式，結(jié)合語境并分析選項(xiàng)做出選擇．

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