of the students in our class interested in micro blogs (微博) on the Internet. A. Two fift

问题补充：

of the students in our class interested in micro blogs (微博) on the Internet.

A. Two fifths; is

B. Two fifths; are

C. Two five; is

D. Two-five; are

答案：

A. Two fifths; is

(答案→)B. Two fifths; are

C. Two five; is

D. Two-five; are

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。根据分析可知选项CD结构有误，当复数名词前后分数修饰时，谓语动词与被修饰的名词保持一致，students是复数形式，故选B。