-Each year fishes are killed by the polluted water and many people are made sick by t

问题补充：

---- Each year fishes are killed by the polluted water and many people are made sick by the polluted air .

----So we should do something to stop it .

A. millions of

B. million of

C. two millions of

D. two millions

答案：

(答案→)A. millions of

B. million of

C. two millions of

D. two millions

解析：英语中数词表示概数时，后面加s，和介词of搭配使用。用原形时表示具体数字和数词搭配使用。句意：每年有无数的鱼被污染的水杀死，许多人被污染的空气致病。结合语境可知本句中表示概数，故选A。