[求助]大全937

1.        With a total population of less than two hundred and fewer breeding females than ever before, the American crocodile seemed a decade ago to be in danger of disappearing.

(A) of less than two hundred and fewer

(B) lower than two hundred and less

(C) lesser than two hundred and fewer

(D) fewer than two hundred and less（A）

(E) of fewer than two hundred and of fewer

答案A。请问of在这里算什么？可以不要吗？

of: used with measurements and expressions of time, age, etc.

EX. 2 kilos of potatoes

   a girl of 12 year

a population of less than 200, 因为population是不可数名词，总不能说：less then 200 population 吧？再者，这里的less than 200 是充当adj的角色，这个adj比较长，可以放置在后面。

希望这样的解释是正确的。