prep2 和prep-21请指教。

2. (24511-!-item-!-188;#058&001020)

Organized in 1966 by the Fish and Wildlife Service, the Breeding Bird Survey uses annual

roadside counts along established routes for monitoring of population changes of as many as, or of more than 250 bird species, including 180 songbirds.

(A) for monitoring of population changes of as many as, or of

(B) to monitor population changes of as many, or

(C) to monitor changes in the populations of

(D) that monitors population changes of

(E) that monitors changes in populations of as many as, or

答案C不存在任何的疑问，我的问题在于原句的是as many as, or of more than….C 选项直接变成more than，难道不算原句意思发生改变？

21. (25681-!-item-!-188;#058&002107)

When Nigeria achieved full independence in 1960, they had already established a federal

political structure consisting of three regions based on the three major population clusters that were in its borders.

(A) they had already established a federal political structure consisting of three regions based on the three major population clusters that were in

(B) they already had established a federal political structure consisting of three regions that was based on the three major population clusters inside

(C) they already had established a federal political structure that consisted of three regions

based on the three major population clusters in

(D) it had already established a federal political structure that consisted of three regions based on the three major population clusters within

(E) it already had established a federal political structure consisting of three regions being based on the three major population clusters it had within

疑问：D and E 中，had already established 与 already had established 有什么区别？

还有consist of的用法，被动？D选项中的that consisted of 能不能改成consisting?

up up up

怎么没有人帮我？

是不是太弱智了。。？

55555/