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【GMAT逻辑CR】8801-OG16

浏览次数:48 日期:2017-05-10 13:57:19
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.

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.


【申友解析】


正确答案:D


题干:一种对治疗很多传染病有特效的药物目前可以从稀有树种IBORA的树皮当中提取。平均5000株IBORA的树皮能制成1公斤的药物。所以,制造该种药物会最终导致IBORA树的灭绝。
题目:下面哪一个选项严重削弱了题干中的逻辑。
分析:引入他因型的负向逻辑,我们需要找到在对IBORA树皮大量需求的基础上可持续发展的他因。
选项A, 用IBORA树皮制成的药物由中央统一派发给医生, 对IBORA的生存与否并无影响。
选项B,用IBORA树皮制成的药物非常昂贵,无关属性,无关乎IBORA的生存。
选项C,IBORA的树叶也应用在很多医药产品中,引入无关对象。
选项D,IBORA树可以通过树枝经过培植而繁殖,该属性增加了IBORA提出了IBORA易于繁殖的属性,增加了IBORA在大量需求的基础上存活下来的可能性。正确!
选项E,IBORA树通常生长在难以到达的地区,无关IBORA在大量需求情况下的生存繁殖。无关属性!

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