68. 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 tree 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.
key is D. Why not E? Weaken题型直接削弱A,A不可行或A没有意义,本题即production could not continue.
thanks.
注意原文的结论continued production of the drug must inevitably lead to the ibora’s extinction。
很明显是继续生产这个药,而这个药只能从the bark of the ibora中获得,所以持续生产就意味着继续消耗the bark of the ibora,与它在什么地方没有关系。所以E是无关选项。
谢谢leeon!
可是还是不太明白,如果A是continued production of the drug,B是ibroa's extinction,那么我直接说由于ibora inaccessable,A根本不成立,不就已经削弱了命题么?
感觉是我想偏了,但是根据“A不可行或A没有意义”,E应该可以作为选项啊。能再讲讲么?tks
'直接说由于ibora inaccessable' will make the total argument failed.  eople can not use the bark and no drug made.
本題的關鍵是extinction, 選項D說其實IBORA可以繁殖,直接否定原推論
E選項充其量只是間接削弱,inaccessible並非是 can't access....
我也想请教一下,在OG对E的解释是这样说的“Finally, if th eibora is lagely inaccessible, this bears on the question of whehter production of the drug could continue, not on what would happen if it idid continue”
不是很明白为什么说E是 this bears on the question of whehter production of the drug could continue,
请指教
OG的意思我理解是:如果大部分bark生长在人们无法去的地区,那么不存在我们大量使用后的结果了,因为我们连用都不太可能用到。所以E不是把我们题目最基本的前提都给否定掉了,连推论都可能不存在了。
说要找出削弱推论的,至少推论要能够存在。希望我说清楚了,不知道怎么表达好。
不好意思斑竹,我对这题还是有疑惑
那如果假设这种树有很多很多,虽然大部分生长在inaccessible的地方,但accessible的地方也有足够多的这种树可以为这种药提供树皮,那末药的生产也不会使树灭绝,因为在inaccessible的地方还有很多这种树呢
那E不就能weaken了吗
困惑阿 请指教
楼上的精神很令人感动,但是MM可以考虑这个most seriously weakens ,所以我选D,因为只要human没有extinct,那么ibora就没法extinct,够most吧;相反E的inaccessible就存在不确定因素,今天inaccesible未必明天还是inaccessible,何况还有其他自然条件的变化,都可以导致ibora的extinct。
更进一步的说,因为造药使得ibora灭绝,要削弱这个argument还是应该从造药不能使得ibora灭绝来着手。E说的根本就是以后没法造药,但是还是有ibora存在,是不会出现结论的情况,但问题是这个跟argument无关啊,不是基于这个argument的。OG的解释Finally, if th eibora is lagely inaccessible, this bears on the question of whehter production of the drug could continue, not on what would happen if it idid continue说的大概就是这个意思。
babypace
EXACTLY!
babypace 发表于 2004-12-14 05:38
OG的意思我理解是:如果大部分bark生长在人们无法去的地区,那么不存在我们大量使用后的结果了,因为我们连 ...
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