BraveMBA的LSAT逻辑

braveMBA · 发表于 2003-5-4 23:36:00

16. The current proposal to give college students a broader choice in planning their own courses of study should be abandoned. The students who are supporting the proposal will never be satisfied, no matter what requirements are established. Some of these students have reached their third year without declaring a major. One first-year student has failed to complete four required courses. Several others have indicated a serious indifference to grades and intellectual achievement.
A flaw in the argument is that it does which one of the following?
(A) avoids the issue by focusing on supporters of the proposal
(B) argues circularly by assuming the conclusion is true in stating th e premises.
(C) fails to define the critical term "satisfied"
(D) distorts the proposal advocated by opponents
(E) users the term "student" equivocally
答案A

18. The question whether intelligent life exists elsewhere in the universe is certainly imprecise, because we are not sure how different from use something might be and still count as "intelligent life" Yet we cannot just decide to define "intelligent life" in some more precise way since it is likely that we will find and recognize intelligent life elsewhere in the universe only if we leave our definitions open to new, unimagined possibilities.
The passage, if seen as an objection to an antecedent claim. Challenges that claim by:
(A) showing the claim to be irrelevant to the issue at hand
(B) citing examples that fail to fit proposed definition of "intelligent life"
(C) claiming that "intelligent life" cannot be adequately defined.
(D) arguing that the claim, if acted on, would be counterproductive
(E) maintaining that the claim is not supported by the available evidence.
答案D

23. When 100 people who have not used cocaine are tested for cocaine use, on average only 5 will test positive. By contrast. of every 100 people who have used cocaine 99 will test positive. Thus, when a randomly chosen group of people is tested for cocaine use. the vast majority of those who test positive will be people who have used cocaine.
A reasoning error in the argument is that the argument
(A) attempts to infer a value judgment from purely factual premises.
(B) attributes to every member of the population the properties of the average member of the population.
(C) fails to take into account what proportion of the population have used cocaine.
(D) ignores the fact that some cocaine users do not test positive.
(E) advocates testing people for cocaine use when there is no reason to suspect that they have used cocaine.
答案是C，我觉得是不是C选项少了一个NOT？

另外象这种题，是不是可以考虑直接EXCEPT猜E呀，太占时间了。
24. If a society encourages freedom of thought and expression, then, during the time when it does so, creativity will flourish in that society. In the United States creativity flourished, during the eighteenth century. It is clear, therefore, that freedom of thought was encouraged in the United States during the eighteenth century.
An error of reasoning of the same kind as one contained in the passage is present in each of the following arguments EXCEPT:
(A) According to the airline industry, airfares have to rise if air travel is to be made safer; since airfares were just raised, we can rest assured that air travel will therefore become safer.
(B) We can conclude that the Hillside police department has improved its efficiency, because crime rates are down in Hillside, and it is an established fact that crime rates go down when police departments increase their efficiency.
(C) People who are really interested in the preservation of wildlife obviously do not go hunting for big game; since Gerda has never gone hunting for big game and intends never gone hunting for big game and intends never to do so. it is clear that she is really interested in the preservation of wildlife.
(D) If the contents of a bottle are safe to drink, the bottle will not be marked "position" so, since the bottle is not marked "poison", its contents will be safe to drink.
(E) None of the so-called Western democracies is really democratic, because, for a country to be democratic, the opinion of each of its citizens must have a meaningful effect on government, and in none of these countries does each citizen's opinion have such an effect.
E显然是逆否命题的推导，同问题中的A->B, then BàA是不同。我只是想问，这样的题不会出现在GMAT中吧，而且如果是在D，就…..

zxppx · 发表于 2013-5-17 12:27:14

braveMBA 发表于 2003-5-4 23:36
16. The current proposal to give college students a broader choice in planning their own courses of ...

24. If a society encourages freedom of thought and expression, then, during the time when it does so, creativity will flourish in that society. In the United States creativity flourished during the eighteenth century. It is clear, therefore, that freedom of thought was encouraged in the United States during the eighteenth century.
Error: freedom→creativity, so creativity→freedom
An error of reasoning of the same kind as one contained in the passage is present in each of the following arguments EXCEPT:
(A) According to the airline industry, airfares have to rise if air travel is to be made safer; since airfares were just raised, we can rest assured that air travel will therefore become safer.
(B) We can conclude that the Hillside police department has improved its efficiency, because crime rates are down in Hillside, and it is an established fact that crime rates go down when police departments increase their efficiency.
(C) People who are really interested in the preservation of wildlife obviously do not go hunting for big game; since Gerda has never gone hunting for big game and intends never to do so, it is clear that she is really interested in the preservation of wildlife.
(D) If the contents of a bottle are safe to drink, the bottle will not be marked “poison,” so, since the bottle is not marked “poison,” its contents will be safe to drink.（E）
(E) None of the so-called Western democracies is really democratic, because, for a country to be democratic, the opinion of each of its citizens must have a meaningful effect on government, and in none of these countries does each citizen’s opinion have such an effect.
逆否命题，正确

BraveMBA的LSAT逻辑

BraveMBA的LSAT逻辑

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