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）
(E) The ibora generally grows in largely inaccessible places.
是否应该选D？
嗯，我认为是D。D从根本上否定了Ibora灭绝的可能性，因为可以人工种植。而E只是说难以采集野生的Ibora；从这种药物正在生产的事实可以看出，目前Ibora还是可以采集到的，因此继续生产药物仍然可能导致Ibora灭绝。
E is. If the question says that it is inaccessible, it means nobody can get there. Then the trees cannot be cut.
D is very weak. We have been breeding many kinds of wild animals but many of them are extinct.
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