陈向东逻辑42页18题 assumption求解！

泽贼 · 发表于 2012-3-3 15:45:07

Although part of the ivory available on world markets was taken from wild elephants that were killed illegally, some ivory is derived from sources that nearly all nations define as legal, such as elephants that have died natural deaths. The world's few remaining wild elephant herds, therefore, are not endangered when thouse buying ivory at wholesale make a serious effort to limit their purchases to such legal ivory.
The argument above depends on the assumption that
A. wholesale buyers attempting to limit their purchases to legal ivory can reliably distinguish legal from illegal ivroy
B. the demand for products made from legal ivroy will continue to grow in the near future
C.there are currently fewer wholesale sources of legal ivory in the world than there are illegal ivroy

D. wholesale buyers of ivory products are generally unaware of the reasons for the dwindling world supply of ivory
E. a continued supply of legal ivory is ensured because elephants reproduce in captivity

答案是A，但是我觉得C也挺靠谱的啊，如果合法象牙更多的话那么野象不就更少了么。。各位大神路过求解~

泽贼 · 发表于 2012-3-3 21:48:04

木有人理我啊。。。桑心。。。

陈向东逻辑42页18题 assumption求解！

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