标题: 大全-8-1的答案是不是不对啊？ [打印本页] 作者: muller 时间: 2003-12-12 06:12 标题: 大全-8-1的答案是不是不对啊？ 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. 大全给的答案是E,可我书上的答案是D.而且我觉得也是D好，到底哪个正确？ 作者: susan7375 时间: 2003-12-12 14:39
我觉得是D，而且好像也在哪儿看到过，是D 而从推理上来说，我也觉得是D 文中说 extinction.D则说can be propagated 而E却inaccessible