题目内容

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

试题分析：英语分数的表达是分子用基数词，分母用序数词，分子超过一，分母用复数。先排除B,D,故选A。句意为：据说火星的重力只有地球重力的八分之三。
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