请教LSAT-9-4-21

dansy

So-called environmentalists have argued that the proposed Golden Lake Development would interfere with bird-migration patterns. However, the fact that these same people have raised environmental objections to virtually every development proposal brought before the council in recent years indicates that their expressed concern for bird-migration patterns is nothing but a mask for their antidevelopment, antiprogress agenda. Their claim, therefore, should be dismissed without further consideration.

For the claim that the concern expressed by the so-called environmentalists is not their real concern to be properly drawn on the basis of the evidence cited, which one of the following must be assumed?
(A) Not every development proposal opposed in recent years by these so-called environmentalists was opposed because they believed it to pose a threat to the environment.
(B) People whose real agenda is to block development wherever it is proposed always try to disguise their true motives.
(C) Anyone who opposes unrestricted development is an opponent of progress.
(D) The council has no reason to object to the proposed Golden Lake Development other than concern about the development’s effect on bird-migration patterns.
(E) When people say that they oppose a development project solely on environmental grounds, their real concern almost always lies elsewhere.

答案是A。
话说为了证明这些所谓环境保护者实际上是反进步反发展的落后分子，前提是(A中说)： 并不是每一个被他们反对的都被反对了。感觉不够强劲。如果说所有他们反对的最后都实施了，还可以吧。B 和E 呢？大家觉得？
多谢指教！

snow_mountain

这段话的推理是， 因为这帮家伙总是拿对环境有害为理由，反对几乎所有的提案，所以他们真的的目的不是环境问题，而是反对发展。所以不要理他们。

假如对环境有害的确是真的理由的话，那下面的都不成立了。也就是对A取非的观点。 B和E都不相关。

番茄炒蛋

原文里有一句话
these same people have raised environmental objections to virtually every development proposal
这个every很重要

a中的 Not every development proposal was opposed because 。。。。。

有了a的这个假设，就可以明显的看出这些所谓的环保主义者的矛盾之所在，也就有助于得出原文的结论

b是有问题的，虽然这个true motives可能不是环保，但你不能因为这个理由就说环保是错的，反对开发是错的啊，这个逻辑不成立

另外e中的solely on environmental grounds这个solely有问题，文中没有提到是solely或是同时提出好几个，而且这个和原文也没有什么很大的冲突

答案一定是有很明显的冲突才能选的

dansy

再次谢过两位！还在琢磨ing...
有点觉得自己做逻辑好像脑袋少根jing. 郁闷中。。。

番茄炒蛋

呵呵，我和bronoy的方法有些不一样，他是技术派，我是更多的理解派吧，呵呵，结果都一样，到现在我的取非法都用不好，还要学习啊