It is said that the gravity on Mars is only aboutof the gravity on earth.A. three-eighthsB

问题补充：

It is said that the gravity on Mars is only aboutof the gravity on earth.

A. three-eighths

B. third-eighth

C. third-eighths

D. third-eight

答案：

(答案→)A. three-eighths

B. third-eighth

C. third-eighths

D. third-eight

解析：英语中一般用基数词表示分数的分子，用序数词表示分数的分母。当分子是一时，分数的分母用单数形式，在表示分数时，当分数的分子大于一时，分数的分母要用复数形式。由分数修饰的主语后面谓语动词的数，和被修饰主语的单复数保持一致。根据分析可知选项BCD结构有误，故选A。