of the chemical factories in their city pouring waste water into the river. It’s too dange

问题补充：

of the chemical factories in their city pouring waste water into the river. It’s too dangerous.

A. Two fifths; are

B. Two fifths; is

C. Two fifth; are

D. Two fifth; is

答案：

(答案→)A. Two fifths; are

B. Two fifths; is

C. Two fifth; are

D. Two fifth; is

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。句意：他们城市中五分之二的化工厂把污水注入这条河流。太危险了。结合语境可知选A。