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.
D吧。
E够迷惑的，不过如果ibora grows in largely inaccessible places的话，那也谈不上continued production of the drug了。
Conclusion是因为生产药，所以导致ibora的绝种。 药的原料ibora如果可以培植的话，就谈不上绝种了。
大家讨论。。。
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