问题补充：
About of the teachers in our school young people under thirty.
A. two-five, are
B. second-fifth, is
C. two-fifths, are
D. two-fifth, is
答案：
A. two-five, are
B. second-fifth, is
(答案→)C. two-fifths, are
D. two-fifth, is
解析：“五分之二”写成英语是；two-fifths; two-fifths of the teahcers是复数形式，谓语动词用are.
