单选题 ______ of the machines on display were made in China.
A. Second-fifths B. Two-fifth
C. Two-fifths D. Second-fifths

【正确答案】 C
【答案解析】分数的表达足以基数词代表分子，序数词代表分母，除了分子是“1”的情况外，序数词要用复数。