[求助]请教一道逻辑题

nici37

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 manufactures 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.

这道题出自陈向东的《GMAT 逻辑推理》。


给出的答案是B, 但是我觉得是C。

希望大家给点意见，谢谢！

nici37

有哪位回答一下吗？

auflute

将C项取否，假如价格一样的时候，欧日造纸厂不偏好美国纸浆，那么当美国纸浆价格低有优势时，欧日造纸厂未必不会买美国纸浆，结论依然能成立。

也就是说欧日造纸厂对美国纸浆的偏好这个因素，只作用于价格一样的情况，对于美国纸浆价格低的情况构不成影响


或者说欧日造纸厂偏好度这个因素，是基于价格一样的情况成立的，假如美国纸浆价格低时，其影响未知。

[此贴子已经被作者于2009-5-2 16:13:54编辑过]

auflute

进一步总结的话，假如对于assumption中的排除他因题型，选项讨论的他因不是通用的，而只适用某一特定情形，且该特定情形非题干结论中的特定情形，则应该排除。本质上还是说明该他因不是必要条件。

nici37

谢谢楼上的回复！！！

nici37

个人感觉逻辑题中，assumption类型的题是最有难度的一种题型了，不知大家怎么看？