lsat6 section 3 6.Four randomly chosen market research companies each produced population estimated for three middle-sized cities; the estimates of each company were then compared with those of the other companies. Two of the cities had relatively stable populations, and for them estimates of current population and of projected population in five years varied little from company to company. However, for the third city, which was growing rapidly, estimates varied greatly from company to company.
6.Which one of the following, if true, would best here explain why estimates of the current population of the rapidly growing city varied more than did current population estimates for the two other cities?
(A) Population changes over time are more uniform form one district to another in the rapidly growing city than in the two other cities.
(B) The population of the rapidly growing city is increasing largely as a result of a high birth rate.
(C) The population of the rapidly growing city has a lower average age than the populations of either of the two other cities.
(D) All population estimates of the rapidly growing city were produced first by estimating the current populations of the city's districts and then by adding those estimates.
(E) Whereas the companies used different methods for estimating the current population of the rapidly growing city, the companies used the same method for the two other cities. 答案是E 这道题根本就没看懂不知道是什么意思啊？ 10. Anyone who fails to answer a patient's questions cannot be a competent physician. That is why I feel confident about my physician's competence: she carefully answers every one of my questions, no matter how trivial.
Which one of the following most closely parallels the flawed reasoning in the argument above?
(A) Anyone who grows up in a large family is accustomed to making compromises. Meredith is accustomed to making compromises, so she might have grown up in a large family.
(B) Anyone who is not in favor of this proposal is ill informed on the issue. Jeanne opposes the proposal, so she is ill informed on the issue.
(C) No one who likes music misses a performance of the symphony. Paul likes music, yet last week he missed a performance of the symphony.
(D) Anyone who works two or more jobs is unable to find a balance between professional and personal life. Maggie has only one job, so she can find a balance between her professional and personal life.
(E) No one who is hot-tempered and strong-willed will succeed in this business. Jeremy is strong-willed, so he will not succeed in this business. 答案是D 这道题题是看懂了！但不知道犯了什么推理错误啊！不会！ 15.Twenty years ago the Republic of Rosinia produced nearly 100 million tons of potatoes, but last year the harvest barely reached 60 million tons. Agricultural researchers, who have failed to develop new higher yielding strains of potatoes, are to blame for this decrease, since they have been concerned only with their own research and not with the needs of Rosinia.
Which one of the following is an assumption on which the argument depends?
(A) Any current attempts by agricultural researchers to develop higher-yielding potato strains are futile.
(B) Strains of potatoes most commonly grown in Rosinia could not have produced the yields last year that they once did.
(C) Agricultural researchers often find concrete solutions to practical problems when investigating seemingly unrelated questions.
(D) Wide fluctuations in the size of the potato crop over a twenty-year period are not unusual.
(E) Agricultural research in Rosinia is funded by government grants.
1. 人口预测. 三个中型城市: two are stable, and one is growing rapidly. The estimates from companies on the two are close, while the estimates on the growing city vary. 因为方法不同.
2. Not A --> Not B ==>A-->B 充分必要条件
3. 此题有一点绕, 但A不对.原文的逻辑推理为: failure to develop high-yied --> poor harvest. B取非, 普通的P也能达到产量,就说明不是品种的问题. A不对是太绝对. failure to develop也许是项目进行到了80%. 对A取非: 不是所有的attempt都是futile,不能说明能制造出high-yield.
就此题来讲, 将A取非, 得到"Not any attempt ...". 如果A为assimption,那么取非原结论没有根据. 即Not any attempt ...--> agricultural researchers can produce high-yield strains.
可以看出上述推理不成立, 因为造成没有high-yield品种地原因不明,原题没有给,可以说是out of scope. 我们可以猜到的有时间不足(即使所有的努力都是有成效的,也许也要10年后才能生产出).
这道题你也可以换个角度想: futile attempt只是造成failure to produce high-yield strain的一个原因, arguer也许认为是其它原因造成的.比如原文所说的:"since they have been concerned only with their own research and not with the needs of Rosinia". 如果答案把解释局限于one specific, 一般都错.
如果A为"Due to some reasons, agricutural researchers failed to developed a high-yield strain", 就对了.
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发表于 2003-4-17 20:43:00
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