OG-180, 看不懂E选项

180. In the arid land along the Colorado River, use of the river’s water supply is strictly controlled: farms along the river each have a limited allocation that they are allowed to use for irrigation. But the trees that grow in narrow strips along the river’s banks also use its water. Clearly, therefore, if farmers were to remove those trees, more water would be available for crop irrigation.

Which of the following, if true, most seriously weakens the argument?

(A) The trees along the river’s banks shelter it from the sun and wind, thereby greatly reducing the amount of water lost through evaporation.

(B) Owners of farms along the river will probably not undertake the expense of cutting down trees along the banks unless they are granted a greater allocation of water in return.

(C) Many of the tree species currently found along the river’s banks are specifically adapted to growing in places where tree roots remain constantly wet.

(D) The strip of land where trees grow along the river’s banks would not be suitable for growing crops if the trees were removed.

(E) The distribution of water allocations for irrigation is intended to prevent farms farther upstream from using water needed by farms farther downstream.

这题对正确答案没有疑问。但是看不懂E在说什么？！谢谢！

呵呵,好像是防止上游的农场使用下游农场需要使用的水

词题的D选项为什么错呀,属于哪类错误.

请nn指教

关于A选项，我当时排除的原因是觉得即使trees can reduce the amount of water lost through evaporation,但也没说这个防止水蒸发的量一定大于树本身用水的量啊？

不知道我的疑惑有没有表达清楚，请NN帮忙回答一下吧～

babypace

EXACTLY！