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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?

正确答案: D

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楼主
发表于 2013-6-22 15:16:54 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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.

premise1: 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
premise2:  It takes the bark of 5,000 trees to make one kilogram of the drug.
conclusion: continued production of the drug must inevitably lead to the ibora’s extinction.

正解D,
请问C选项为什么不可以weaken?
结论是:持续的生产这种药不可避免地导致了ibora的灭绝
1. 我举个他因导致了ibora的灭绝,不就是weaken了么?
    他因就是C选项,因为对ibora的叶子可以用来生产一些药物,可能这些对ibora的需求超过了原文中drug对ibora的需求。
2.bat版主说这个结论不是一个因果型结论,请问为什么?(持续的生产这种药不可避免地导致了ibora的灭绝
   ,难道不是一个因,一个果吗?)
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沙发
发表于 2013-6-22 15:47:38 | 只看该作者
1. C完全没定量,也就是说1片叶子就能生产几百万吨药,从理论上来讲也是可能的。
2. 养过蚕没有?桑叶摘下,桑树是不是就彻底死了?
3. x和y同时捅z一刀,z死了,能不能说因为x捅了z一刀,z的死就和y没有关系?
板凳
 楼主| 发表于 2013-6-22 16:24:31 | 只看该作者
francoisyang 发表于 2013-6-22 15:47
1. C完全没定量,也就是说1片叶子就能生产几百万吨药,从理论上来讲也是可能的。
2. 养过蚕没有?桑叶摘下 ...

按照你说的,1片叶子能生产几百万吨药;
那么每年需求几百亿吨药,那是不是在理论上也会耗费大量的ibora的树木,导致了ibora树的灭绝?
地板
发表于 2013-6-22 23:54:43 | 只看该作者
peby1223 发表于 2013-6-22 16:24
按照你说的,1片叶子能生产几百万吨药;
那么每年需求几百亿吨药,那是不是在理论上也会耗费大量的ibora ...

如果要再加其他未提到的假设,随便什么话都可以weaken;提到的信息不给出充分的信息,就不算weaken。
5#
发表于 2013-6-25 08:52:39 | 只看该作者
不确定我想的对不对,我的理解是 continued production of the drug must inevitably 导致了----> the ibora’s extinction.
题目让我们去weaken,那么c选项中说道:这树叶能用于多种药物,那么对于这种叶子就会有需求,所以对这些medicine的production同样会导致这个ibora‘s extinction
这个和原文中的continued production of the drug好像没有什么本质的区别,这个并没有起到weaken的作用
个人理解
6#
发表于 2016-8-12 03:06:40 | 只看该作者
因:生产药--->果:植物濒临灭绝。因确定(不可能因果都有问题,否则就不能做了),果由问题。找他果GAP使得即生产药,植物又不灭绝。

C不对,因不能改变。
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