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题库 / Prep2007E1-CR-67
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?
The drug made from ibora bark is dispensed to doctors from a central authority.
The drug made from ibora bark is expensive to produce.
The leaves of the ibora are used in a number of medical products.
The ibora can be propagated from cuttings and grown under cultivation.
The ibora generally grows in largely inaccessible places.
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P：有效药来自一种树的树皮，这种树在野外很稀少的，且要很多的树皮才能产生一点药
C：持续的生产药会导致树灭绝
削弱方向：持续生产不会导致树灭绝
选项E：如果largely inaccessible的话，就没办法使药品continued production，谈论的点偏离了，应该关注的是持续生产会不会导致灭绝
选项D：没选D是觉得还需要一点脑补，即人们会使用cutting的方式培养。实际上，D直接给出了不会导致灭绝的方法。
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