OG12-23 CR

ccx

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 5000 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  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 ibara 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 cutting and grown under cultivation
E. the ibora generally grows in largely inaccessible places
答案是 D
请问C为什么不选？

sayysong

bark of ibora才是炼药的原材料，跟C中的leaves无关，所以C是由irrelevant来排除的。

云南

leaves是无关选项，应该排除，并且我们也不知道ibora的叶子也是丰富的

goodwinnie

OG解释：
Argument Evaluation
Situation    
The extinction of the rare ibora tree is inevitable if production of an effective infection-fighting drug continues.
Reasoning    
Which point most weakens the argument? The production of the drug requires such an enormous amount of bark that, the argument concludes, the continuing existence of the rare tree is in jeopardy. But the argument assumes that killing the trees in the wild is the only way to obtain the needed bark. Can the tree be cultivated? If so, the majority of the trees in the wild could be left to flourish.
A．The method of the drug's distribution is irrelevant, unless the central authority can limit the drug's production from the bark of wild ibora trees. But this information is not provided.
B．The cost of producing the drug does not affect the outcome for the tree unless it deters production.
C．The existence of uses for other parts of the tree opens the possibility that the ibora-bark drug would cause no increase in destruction of trees other than what exists already. If this information were provided, it would weaken support for the conclusion. Since it is not provided, this option does not significantly weaken the argument.
D．Correct. This information most weakens the argument.
E.  Difficulty of access to the trees could provide a disincentive to their harvestings—but we are not told that it would prevent their harvesting.
The correct answer is D.

关于C选项的解释没有看懂。什么意思啊，能不能帮忙解释解释？
题中说5000棵的树皮才提炼出1千克的药，因此，继续制造这种药会导致I树的灭绝。那C选项，I树的树叶能用于制造一些药，从另一方面来说，也可能导致I树的减少，甚至灭绝，那不也是削弱了？因为可能不是因为生产由I树树皮的要，而是生产I树树叶的药导致I树灭绝？ 求指正。

xbx_lee

叶子被用可能是主因，也可能不是，文章中没有明确，所以不如D直接有效地weaken。

xibao

C???

leweiyang

原文开头：a drug that is highly effective in treating many types of infection can 实质上已经将drug做限定，是用来治疗感染用的。

C. the leaves of the ibora are used in a number of medical products
   一些医药产品用ibora的叶子生产。
 medical products是原文要的drug吗，没说清楚，需要ibora的叶子的量也没给出来，信息不足，没有作用的选项。

almond518

OG12对于C的解释是什么意思啊？谢谢

xiaoqiaoli

是啊是啊~~C选项什么意思？怎么解释啊~~

为什么那个条件成立了就可以weaken呢？

C．The existence of uses for other parts of the tree opens the possibility that the ibora-bark drug would cause no increase in destruction of trees other than what exists already. If this information were provided, it would weaken support for the conclusion. Since it is not provided, this option does not significantly weaken the argument.

zwhjzwhj

同问啊，有木有高手来解释一下，OG关于C项的解释，在说什么