问题补充:
About of the students in Grade Nine this year were born in the.
A. three five; 1996.
B. three fifths; 1990s
C. third fifth; 1997.
D. third fifths; 1990s
答案:
A. three five; 1996.
(答案→)B. three fifths; 1990s
C. third fifth; 1997.
D. third fifths; 1990s
解析:分数的构成为分子用基数词,分母用序数词,分子如果大于1,则分母序数词一般都用复数形式,故用排除法只能选B项。