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近开始看OG 12TH的逻辑，有许多问题不太明白，希望知道的朋友能帮助下~~谢谢~PS 因为还是刚开始复习逻辑，所以XDF和LAWYER得方法我还在比较中，可能都用到了，希望大家理解。。。直接贴题目了（一次不发太多，分多次发。。。。） 23. A drug that is highly effective in treating many types of infection can, at present, be obtained only from the bark of the ibora, a tree that is quite rare in the wild. It takes the bark of 5,000 trees to make one kilogram of the drug. It follows, therefore, that continued production of the drug must inevitably lead to the ibora's extinction. Which of the following, if true, most seriously weakens
the argument above? (A) The drug made from ibora bark is dispensed to doctors from a central authority.
(B) The drug made from ibora bark is expensive to produce.
(C) The leaves of the ibora are used in a number of medical products.
(D) The ibora can be propagated from cuttings and grown under cultivation.
(E) The ibora generally grows in largely inaccessible places.
对于B选项，虽然和正确选项比起来还有一点差距，可是我觉得这个选项削弱了文章所说的结果可能性，因为生产这种药很贵，所以不会大量生产，因此不会使树灭绝。这算削弱文章结果的可能性吗？（貌似XDF的老师说过。。。。削弱可能性也可以的。）OG上的解释是这样的：the cost of producing the drug does not affect the ourcome for the tree unless it deters production. Deter的意思是阻碍，B选项难道不就是这个意思么？困惑。。。
24. The Plexis Corporation, a leading computer chip manufacturer, is currently developing a new chip, which is faster and more efficient than any computer chip currently in use. The new chip will be released for sale in twelve months. Plexis' market research has shown that initial sales of the new chip would be maximized by starting to advertise it now, but the company has decided to wait another six months before doing so.
Which of the following, if true, provides the Plexis Corporation with the best reason for postponing advertising its new chip?
(A) Some computer users are reluctant to purchase new computer products when they are first released.
(B) The cost of an advertising campaign capable of maximizing initial sales of the new chip would be no greater than campaigns previously undertaken by Plexis.
(C) Advertising the new chip now will significantly decrease sales of Plexis' current line of computer chips.
(D)  lexis' major rivals in the computer chip manufacturing business are developing a chip with capabilities that are comparable to those of Plexis' new chip.
(E) Taking full advantage of the capacities of the new chip will require substantial adjustments in other segments of the computer industry. 我能选出正确答案，关键是对OG上关于B选项的解释不太理解： The advertising campaign's cost, if it is particularly high, might be a reason for Plexis to delayit—but that the cost will not be significantly different from that of other ad campaigns provides
no compelling reason for delay.红字部分的推断是怎么来的？题目中没有这方面的比较啊？？而且B选项我觉得好像也没有什么错误。。。。 45. Some anthropologists study modern-day societies of foragers in an effort to learn about our ancient ancestors who were also foragers. A flaw in this strategy is that forager societies are extremely varied. Indeed, any forager society with which anthropologists are familiar has had considerable contact with modern, non-forager societies.
Which of the following, if true, would most weaken the criticism made above of the anthropologists' strategy?
(A) All forager societies throughout history have had a number of important features in common that are absent from other types of societies.
(B) Most ancient forager societies either dissolved or made a transition to another way of life.
(C) All anthropologists study one kind or another of modern-day society.
(D) Many anthropologists who study modern-day forager societies do not draw inferences about ancient societies on the basis of their studies.
(E) Even those modern-day forager societies that have not had significant contact with modern societies are importantly different from ancient forager societies. 关于C选项，有一点点小疑问，这个选项说的是所有的学者都研究一种类型的MD社会，那么能不能判断这个选项为，显示因果的资料不正确？（或者是不具有代表性？）
另外，这个题目的名词好多，。有modern-day forager society ,modern non-forager society 和forager society，有点晕，想请NN帮帮忙，帮我写一下推理链，我怎么都理不出头绪、、、 | 
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发表于 2009-10-31 21:35:00
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