有木有人能解释这道题，天山-10-7！

gmatbiguo

Which of the following most logically completes the argument below?
The expansion of large-scale farming in Africa and Asia has destroyed much of the natural vegetation on which elephants have historically depended, forcing them to turn to cultivated land to satisfy their enormous appetites. As a result, farmers have lost millions of dollars worth of crops annually. Yet even if elephant sanctuaries were created on a widespread basis to guarantee elephants sufficient natural vegetation, the raiding would likely persist, since      
A.    when elephants forage for food, they typically travel in herds.
B.    Foraging elephants have been known to cause substantial damage even to plants that they do not eat.
C.    Some of the land where crops have suffered extensive damage from elephants has been allowed to return to its natural state.
D.    Elephants tend to prefer cultivated crops to wild vegetation as a food source.
E.    Elephant sanctuaries are usually created in areas that are rich in the natural vegetation on which elephants have historically depended.
答案选D，我选了B。想问下B为什么不对呢？

gmatbiguo

要沉了，大家帮忙看看

kikisunflower

题目说大象即使有了充足的天然食物来源，还是要去吃人种的菜，问原因

说明大象要吃人种的菜不光是因为天然食物来源匮乏，找他因

D说大象喜欢吃人种的菜，不高兴吃野生的（他因，正确）

B说大象吃东西的时候会伤到那些他们不吃的植物（不是大象会吃人种的菜的原因，无关）

gmatbiguo

题目说大象即使有了充足的天然食物来源，还是要去吃人种的菜，问原因

说明大象要吃人种的菜不光是因为天然食物来源匮乏，找他因

D说大象喜欢吃人种的菜，不高兴吃野生的（他因，正确）

B说大象吃东西的时候会伤到那些他们不吃的植物（不是大象会吃人种的菜的原因，无关）

-- by 会员 kikisunflower (2011/5/8 12:34:46)

跟B相比，我同意D更好。

mudiduange

B选项：
觅食的大象会破坏不吃的植物。看题干，如果大象保护区和农田分开了，那么即使大象在觅食的时候会破坏它们不吃的，也伤不到农作物。

lianggege

对于A和B，其实对elephants都是有限定的，都是forage，那么就留了一个漏洞，如果elephants被提供了足够的food sources，他们就不会再去觅食了。故D 更好，直接而鲜明！至于D中有没有与题干矛盾，其实是没有的，因为题干说的是vegetation是它们historically depend的一类食物，并未排除它们现在preference改变的可能性！