标题: 请教：大全-10-13 [打印本页]
作者: felicitymq 时间: 2007-4-15 19:34 标题: 请教：大全-10-13
Exports of United States wood pulp will rise considerably during this year. The reason for the rise is that the falling value of the dollar will make it cheaper for paper manufacturers in Japan and Western Europe to buy American wood pulp than to get it from any other source.
Which of the following is an assumption made in drawing the conclusion above?
(A) Factory output of paper products in Japan and Western Europe will increase sharply during this year.
(B) The quality of the wood pulp produced in the United States would be adequate for the purposes of Japanese and Western European paper manufacturers.
(C) Paper manufacturers in Japan and Western Europe would prefer to use wood pulp produced in the United States if cost were not a factor.
(D) Demand for paper products made in Japan and Western Europe will not increase sharply during this year.
(E) Production of wood pulp by United States companies will not increase sharply during this year.
答案是B。可是C为什么不对呀？题意说dollar value下降使得日本和欧洲从美国进口纸浆更便宜。C说如果成本不是一个影响因素，日本和欧洲的造纸厂将宁愿使用美国产的纸浆。这难道不是个假设吗？如果把C取非：“如果成本不是一个影响因素，日本和欧洲的造纸厂将不愿使用美国产的纸浆”。不就是削弱吗？我的理解错在哪里呢？这道题我百思不得其解，请各位NN们指点指点迷津吧。万分感谢！
作者: bobwangwbs 时间: 2007-4-16 07:09
取非不成立是答案的充分条件,而是必要条件!
作者: felicitymq 时间: 2007-4-16 13:00
可是假设不就是结论成立的必要条件吗？
还是我没理解你的意思？
再请解惑。
作者: summertao 时间: 2007-4-17 20:31
从答案与题干的关联性上看,C比B好. 我就是想不通为什么B对.
作者: cindybaobao 时间: 2007-4-19 13:20
逻辑不对。。。。。。。。。美元贬值了，纸价格下降了，所以价钱不是关键，而c强调价钱没用。
只有说质量还是不错，小日本和欧洲还是会购买。
我也错了，太迷惑了。。。。。。。。。关键看得太快，没有仔细想。
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