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

試題分析：英語分數(shù)的表達是分子用基數(shù)詞，分母用序數(shù)詞，分子超過一，分母用復數(shù)。先排除B,D,故選A。句意為：據(jù)說火星的重力只有地球重力的八分之三。
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