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PREP上两道逻辑题求助,谢谢!

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发表于 2011-7-4 12:33:40 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
Jennifer:  Video rental outlets in Centerville together handled 10,000 fewer video rentals in 1994 than in 1993.  The decline in rentals was probably due almost entirely to the February 1994 opening of Videorama, the first and only video rental outlet in the area that, in addition to renting videos, also sold them cheaply.

Brad:  There must be another explanation:  as you yourself said, the decline was on the order of 10,000 rentals.  Yet Videorama sold only 4,000 videos in 1994.

Which of the following, if true, would most seriously weaken the force of the objection that Brad presents to Jennifer's explanation?

(A) In 1994 Videorama rented out more videos than it sold.
(B) In 1994 two new outlets that rent but that do not sell videos opened in Centerville.
(C) Most of the video rental outlets in Centerville rent videos at a discount on certain nights of the week.
(D) People often buy videos of movies that they have previously seen in a theater.
(E) People who own videos frequently loan them to their friends.

答案是E,我选的是A,我认为B这个人没有估计到V这家租卖店租出video的数量,这就已经充分削弱了
求教为什么要引入E选项的概念?

Finding of a survey of Systems magazine subscribers:  Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine:  Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.

For both of the findings to be accurate, which of the following must be true?

(A) More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five.
(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.
(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.
(D) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.
(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine.

答案还是E....这题是彻底没有头绪了...求教

谢谢大家!
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沙发
发表于 2011-7-4 12:56:31 | 只看该作者
If you google within this forum, you would find many posts discussing the above two questions.
板凳
发表于 2011-7-4 14:51:48 | 只看该作者
第一题Jennifer的核心思想是说因为Videorama开张了,导致RENTAL数量大减,因为RENTAL不但出租多,更是很便宜地卖video。卖的多导致RENTAL受到竞争减少了。BRAD驳斥的根据是Videorama卖的总数目并不多才4000张,对于rental的竞争作用应该没那么大。
A没有削弱BRAD,因为A说Videorama出租的数量比卖的多
E说一般人买了video经常会LOAN给朋友们。这样就暗示说虽然卖了4000张,但是实际通过卖VIDEO流通量远远不止4000,对于rental的打击就比表面上大很多 - 削弱了BRAD

第二题LZ可以仔细比较两个statement的差别:
1. 30%下单的SUBSCRIBERS是<35岁的subscribers
2. 几乎所有的下单的人是<35岁的人
其他条件都是一样的,比如都是last year, 都是in response to advertisement in Systems magazine. 但是为啥1里面是30%,2里面是most。 观察区别主要在于:1的主体是subscribers,2里面是people.
要1.2.同时成立:E说很多people下单的都不是subscribers。这样就解释了1和2的看起来似乎有点冲突的数据。LZ可能画个图可以比较形象看出来。这种类似的比例的题目好像蛮多的
地板
发表于 2011-7-12 19:26:34 | 只看该作者
谢谢ls!
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