It is said that the gravity on Mars is only about __________ of the gravity on earth．
A．three-eighthsB．third-eighthC．three-eighthD．third-eighths
A

試題分析：句意：據(jù)說火星上的重力是地球上重力的八分之三。分數(shù)的表達為分子用基數(shù)詞，分母用序數(shù)詞，當分子大于一時，分母的序數(shù)詞用復數(shù)形式；故選A。
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