求教PREP-2，PREP-23

wuyulunbi

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

我上来直接选的C，后来觉得改变了原句的意思，又选回了A，结果答案选C，难道可以改变意思？

23.(25773-!-item-!-188;#058&002128)

While they remove carbon dioxide from the air, conserve soil and water, and house thousands of species, forests also supply potentially valuable pharmaceuticals, and, as sources of building material and firewood, that provide employment for millions worldwide.

(A) pharmaceuticals, and, as sources of building material and firewood, that provide

(B) pharmaceuticals, and sources of building material and firewood, are providers of

(C) pharmaceuticals and, as sources of building material and firewood that are providing

(D) pharmaceuticals and sources of building material and firewood, for providing

(E) pharmaceuticals and, as sources of building material and firewood, provide

我选的D，觉得其他句子结构都有问题，答案选E，个人觉得E选项and前应该有逗号，求解

23.(25773-!-item-!-188;#058&002128)

While they remove carbon dioxide from the air, conserve soil and water, and house thousands of species, forests also supply potentially valuable pharmaceuticals, and, as sources of building material and firewood, that provide employment for millions worldwide.

(A) pharmaceuticals, and, as sources of building material and firewood, that provide

(B) pharmaceuticals, and sources of building material and firewood, are providers of

(C) pharmaceuticals and, as sources of building material and firewood that are providing

(D) pharmaceuticals and sources of building material and firewood, for providing

(E) pharmaceuticals and, as sources of building material and firewood, provide

我选的D，觉得其他句子结构都有问题，答案选E，个人觉得E选项and前应该有逗号，求解

quasimodov

第二题是不是本来有两个意思 就是等于或大于250个种类

wuqian321

22题的确挺怪异的，我觉得一个都不对，没选出答案来。C 我也觉得改变了原句的意思。

23题肯定是E呀，D明显不对，把句子重心都该变了 sources of building material and firewood本来做伴随状况变成做宾语了，provide 反而变成了做状语了。

wuyulunbi

自己顶一下，跪求NN们解答啊！