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标题: [求助]急！~~大家帮帮忙看看吧~~OG12 TH的题目 [打印本页]

作者: 水色青空 时间: 2009-10-31 21:35
标题: [求助]急！~~大家帮帮忙看看吧~~OG12 TH的题目
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、、、

作者: ARCHER420 时间: 2009-10-31 22:15

第一题

选D。此树木可以种植。这样就不会绝种了。

B．贵不代表就不能生产，只要最终产品定价更高就行了。

第二题

B选项的意思是宣传新芯片的广告费用不会比以前的广告高，这就否定了因为价格和成本的原因而推迟广告。最佳答案C，公司打时间差，把上市的存货卖掉后，再推出新产品。这是利益最大化的举措。次佳答案是D，其他的公司也在搞新芯片。但是根据常理，商业广告不会标明怎么制造的细节，多是表述新产品的特色。也不成为推迟新芯片广告的理由。

第三题
在另外一个帖子里面给你解释过了。

作者: 顺天府府尹 时间: 2009-10-31 22:16
23题：B，你说因为生产这种药很贵，所以不会大量生产，这仅仅是你自己的推断而已，题中并没有这种因果关系。

[此贴子已经被作者于2009/10/31 22:16:38编辑过]

作者: 水色青空 时间: 2009-11-20 08:48
看这个，我觉得这样理解比较正确

http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=75368&page=1

呵呵，感谢回答~

作者: cynthia627 时间: 2009-11-22 15:23
嘿嘿，其实我觉得逻辑题重要的还是自己总结方法~ 两种方法我都看了，都很有道理，但是感觉最后真的有进境，还是自己结合自身情况总结的方法~

作者: ajassmine 时间: 2009-11-22 16:06
1 B; 2 C; 3A

同意二楼的推论~

作者: 水色青空 时间: 2009-11-25 22:17
这是你的答案吗？。。。好像不对呢

作者: xiaoyejv 时间: 2009-11-25 23:00
23.答案为D，首先同意二楼顺天的说法，自己的推断是不可加入逻辑推理中的；第二，文章前提1说野生的树很稀有，前提2说
制造此药需要很多这个木材结论：野生的树会被砍光而灭绝，暗含假设用排除他因发可得：此树不可以人工种植，而削弱的方法就是把假设否定掉，即断桥法。第三：如果按照楼主的逻辑，也应该选D，因为GMAT的逻辑是选最好的答案，而不是准确
答案，楼主认为在B的一系列牵强推理后的答案和D来比，哪一种更好呢？

作者: xiaoyejv 时间: 2009-11-25 23:07
45.个人认为选A
首先搞清楚削弱的是什么：人类学家通过现代F社会而去研究古代F是不可取的
接着文中给出的原因是：人类家熟悉的f社会与现在诸多非F社会有广泛的联系，即不具代表性
因此，答案是找出一个合理的解释去解释文中给的原因从而得到人类学家的方法可行这个结论
这个Gmat常用的削弱方法，他因解释前提，从而达到削弱的目的

作者: firecranezou 时间: 2009-11-25 23:45
第23题是lawyer逻辑中说的 weaken题中典型的条件型结论。therefore, that continued production of the drug must inevitably lead to the ibora's extinction. “continued production”结论中的条件，也就是在满足不断生产药物的这样一个条件下，得出这种树的绝种。要weaken这样的条件型结论，一定先要满足条件的情况下才谈是否起到削弱结论的作用。
D的答案满足：即使继续生产，但是通过树木的嫁接繁殖，这种树木仍然不会绝种。所以是正确答案。
而B谈到用这个树皮制造的药物很贵，其实是无关选项。首先这个推理漏洞是-制造成本高并不代表不能继续生产。而且如果按照楼主的思路说因为制造成本高而不能持续生产，继而得出这种树不会灭绝，这样的推论也是不能削弱题干中的结论的。因为“成本高不能继续生产”实际是削弱了题干中条件结论的“条件”-持续地生产，而不是削弱结论-树木绝种。

所以怎么样B都不可能是正确答案。而D才是

作者: 水色青空 时间: 2009-12-8 11:19
恍然大悟！~~ 3Q

非常感谢！

还想请教一下，有哪种题型是可以削弱前提的？还是不能通过削弱前提来达到削弱结论的目的？

如果前提都不能成立，那么结论更不成立，能这样削弱吗？

作者: 水色青空 时间: 2009-12-8 11:21
恍然大悟！~~ 3Q

非常感谢！

还想请教一下，有哪种题型是可以削弱前提的？还是不能通过削弱前提来达到削弱结论的目的？

如果前提都不能成立，那么结论更不成立，能这样削弱吗？

作者: 水色青空 时间: 2009-12-8 11:22
恍然大悟！~~ 3Q

非常感谢！

还想请教一下，有哪种题型是可以削弱前提的？还是不能通过削弱前提来达到削弱结论的目的？

如果前提都不能成立，那么结论更不成立，能这样削弱吗？

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