问题
选择题
It is said that the gravity on Mars is only about __________ of the gravity on earth．
A．three-eighths
B．third-eighth
C．three-eighth
D．third-eighth
答案
答案：A
题目分析：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。