请教LSAT-9-4-11,LSAT-9-4-17

albert

11.A distemper virus has caused two-thirds of the seal population in the North Sea to die since May 1988. The explanation for the deaths cannot rest here, however. There must be a reason the normally latent virus could prevail so suddenly: clearly the severe pollution of the North Sea waters must have weakened the immune system of the seals so that they could no longer withstand the virus.
11. Which one of the following, if true, most strongly supports the explanation given in the argument?
(A) At various times during the last ten years, several species of shellfish and seabirds in the North Sea have experienced unprecedented steep drops in population.
(B) By reducing pollution at its source, Northern Europe and Scandinavia have been taking the lead in preventing pollution from reaching the waters of the North Sea.
(C) For many years, fish for human consumption have been taken from the waters of the North Sea.
(D) There are two species of seal found throughout the North Sea area, the common seal and the gray seal.
(E) The distemper caused by the virus was a disease that was new to the population of North Sea seals in May 1988, and so the seals’ immune systems were unprepared to counter it.

为什么是答案A？好象特征不很明显啊.

17. Certain items—those with that hard-to-define quality called exclusivity—have the odd property, when they become available for sale, of selling rapidly even though they are extremely expensive. In fact, trying to sell such an item fast by asking too low a price is a serious error, since it calls into question the very thing---exclusivity---that is supposed to be the item’s chief appeal. Therefore, given that a price that will prove to be right is virtually impossible for the seller to gauge in advance, the seller should make sure that any error in the initial asking price is in the direction of setting the price too high.
The argument recommends a certain pricing strategy on the grounds that
(A) this strategy lacks a counterproductive feature of the rejected alternative
(B) this strategy has all of advantages of the rejected alternative, but fewer of its disadvantages
(C) experience has proven this strategy to be superior, even though the reasons for this superiority elude analysis
(D) this strategy does not rely on prospective buyers estimates of value
(E) the error associated with this strategy, unlike the error associated with the rejected alternative, is likely to go unnoticed
answer: A
为什么是答案A？

albert

hi...could anybody answer my question?
thank you very much...

mindfree

1. 这道题目答案确实不明显, 可能因为是加强题目,只要有一点加强作用就可. 用排除法可以排除CDE
C. 毫无关系. 原文没有提到饮用水和污染或病毒的关系
D. 无关,原文没有区别seal
E. 相反, 是weaken

B错在没有指出控制污染的效果如何,不能说明现在是否还污染, 对原文起不到作用.

A对是因为最初的观点是认为seal数量的下降是因为seal的一种病毒,隐含意思是因为seal自身的因素(seal中的病毒), 现在认为原因是污染,实际上扩大了范围, 说不是seal本身病毒的原因. A证明了是其它非seal特质的原因在起作用,造成了数种动物的数量下降.

2. 我以前讲过此题. 重要是理解原文和选项的意思. 有些东西越贵卖得越快(exclusivity), 如果为了卖得快而定价低了, 反而会犯错误,导致人们怀疑它的exclusivity. 因为事先不太可能知道合理的价格,所以最初定价时要定得贵.

A的意思解释了这个原则. 因为定价低(既rejected alternative)会导致人们的怀疑(conterproductive).

albert

thank you very much, warm-hearted mindfree...
I almost understand...
I want to find out your original explanation in the summary of LSAT explaination...But I can't find anything...never mind, I would make a complete summary of LSAT explanation after I finish LSAT and post it here as a return to the help from this website and help from friends from here, expecially mindfree..
Thank you, again...

BTW, is the fallacy of E exist in the word "unlike" ?

mindfree

E的错误是在于go unnoticed. 原文明确地指出"...is a serious error, since it calls into question the very thing---exclusivity---that is supposed to be the item’s chief appeal". 结合原文可以知道go unnoticed不是问题.

你是要考LSAT? 你是读LLM还是JD?

albert

以下是引用mindfree在2003-5-16 22:54:00的发言：
E的错误是在于go unnoticed. 原文明确地指出"...is a serious error, since it calls into question the very thing---exclusivity---that is supposed to be the item’s chief appeal". 结合原文可以知道go unnoticed不是问题.

你是要考LSAT? 你是读LLM还是JD?

原文这一段指出的是asking low price的错误, is noticed....
我想the error of asking high price is noticed可以从原文:
the seller should make sure that any error in the initial asking price is in the direction of setting the price too high.
中推出。。
所以，两个都是noticed...所以E中unlike是错的
我的理解对吗？

I don't take lsat test... I just take GMAT...hehe...
thank you for your help, mindfree...I hope to get a high score in GMAT to compensate for my poor GPA..