逻辑大全-10-13

ptlove4ever

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.
正确答案是(B)

ptlove4ever

如题，为什么A不对？

ptlove4ever

感觉选项A和C一样，看起来都可以是可选项，如何排除？

SiyangWu

B) is a necessary assumption. If you negate B), the conclusion of the

passage will fall apart.

A) and C) on the other hand, are not necessary for the argument to

hold. If you negate either, the conclusion still holds.

A) is more like an inference, not necessarily true.

C) is even worse. If C) is true, then Japan and Europe would buy more

paper pulps from U.S. without a change in the value of U.S. dollars.

ptlove4ever

Thanks so much!!!