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 teh 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.
The correct answer is D.
OG: (E) Difficulty of access to the trees could provide a disincentive to their harvesting -- but we are not told that it would prevent their harvesting.
疑问：我也会选D，但是对于E不是太理解。既然ibora在inaccessible places，那随便其他人怎么砍伐，都不会导致extinction吖……
请问这个该如何理解呢？
谢谢！作者: xiaoxiangxixi 时间: 2010-8-29 21:27
注意这句“a tree that is quite rare in teh wild”，quite rare in the wild 不等于 inaccesseble places作者: hedgeforfu 时间: 2010-8-30 20:27
E的致命之处在于原文的结论是有前提的：continued production of the drug 。即结论是在能继续生产的前提下得出结论的。所以如果如E所说的I长在找不到的地方，则无法继续生产，也即结论的前提没满足，不满足结论的条件，更谈不上削弱结论，因为不能继续生产是另外一个问题，不是结论谈论的问题，应该是无关选项。作者: xiaochangshni 时间: 2010-9-1 20:49
我觉得本题的关系元素是 树珍贵， 问题是weaken。
weaken 的方式就是再种植。
不知道这么理解是不是可以？作者: shaoyipeng 时间: 2010-9-2 19:51
我的感觉是与文中的quite rare in the wild矛盾，所以不能选
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