一道prep上的问题

Yolanda416

22. 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 .
(8) 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.  
(0) 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.


答案为何为C而不是A？

cdwayne

(A) is

aoidancing

为什么不是D。。

maestri

我也觉得应该选A.
这题问的是削弱。焦点在于：树移走了，会不会有更多的水用于庄稼灌溉？

C选项：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.  
许多长在这里的树已经适应了这片环境，树根下很湿润。并不能表明不砍树是有好处的的意思。

D选项：The strip of land where trees grow along the river's banks would not be suitable for growing crops if the trees were removed.
说的是那一片地方即便在树移走了之后也不是用于种植，和庄稼灌溉没有关系的

M猫Fishoo

答案是A吧

题干结论是更多水用于灌溉, 不是更多地方用于种植, 所以d无关