[求助]大全-8-1

huawang

1.     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.

答案是E…

请教为什么D不对呢?如果可以人工栽种繁殖，不就不会造成extinction了吗?

dphxmg

D 什莫也说明不了。你能不能先告诉我你根据D作出了何种无根据的推论（猜测）

bigmouse

Choice D is the answer. this question is one of OG example whose num is 68. Pls check. In fact ,choice E is not answer, because this choice is unrelated to the argument mentioned above.

[此贴子已经被作者于2005-3-5 2:58:42编辑过]

huawang

Thank bigmouse and dphxmg!

huawang

还没说完就不小心按到回复

就如bigmouse所说的，这是OG68的题目: (感谢bigmouse的提醒)

以下摘自OG:If the ibora can be successfully cultivated, it is possible to continue production of the drug without threatening the
ibora with extinction. Therefore, choice D is the best answer.

Finally, if the ibora is largely inaccessible (choice E), this bears on the question of whether production of the drug
could continue, not on what would happen if it did continue.