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25.    Because of the recent transformation of the market,  Quore, Inc. must increase productivity, 10 percent over the course of the next two years, or it will certainly go bankrupt. In fact, however, Quore’s production structure is such that if a 10 percent productivity increase is possible, then a 20 percent increase is attainable.
If the statements above are true, which one of the following must on the basis of them also be true?
(A) It is only Quore’s production structure that makes it possible for Quore to survive the transformation of the market.
(B) Quore will not go bankrupt if it achieves a productivity increase of 20 percent over the next two years.
(C) If the market had not been transformed, Quore would have required no productivity increase in order to avoid bankruptcy.
(D) Because of the transformation of the market, Quore will achieve a productivity increase of 10 percent over the next two years.
(E) If a 20 percent productivity increase is unattainable for Quore, then it must go bankrupt.

why 20% works?

八戒

我试一下：

Quore, Inc. not bandrupt ---->increase productivity, 10 percent over the course of the next two years --->a 20 percent increase

E正好是逆否命题。

讨论...........

crusaders

同意 八戒G..
加点理论知识:
逆否命题:
将原命题的条件和结论交换位置
逆否命题的条件应该是原命题的结论的否定，
逆否命题的结论应该是原命题的条件的否定。
再问一下
Because of the recent transformation of the market,  Quore, Inc. must increase productivity, 10 percent over the course of the next two years, or it will certainly go bankrupt.
A(increase) or B(go bankrupt)
是A---->非B？
还是B------>非A？
还是都行？

aadou

以下是引用crusaders在2003-12-23 2:28:00的发言：
同意 八戒G..
加点理论知识:
逆否命题:
将原命题的条件和结论交换位置
逆否命题的条件应该是原命题的结论的否定，
逆否命题的结论应该是原命题的条件的否定。
再问一下
Because of the recent transformation of the market,  Quore, Inc. must increase productivity, 10 percent over the course of the next two years, or it will certainly go bankrupt.
A(increase) or B(go bankrupt)
是A---->非B？
还是B------>非A？
还是都行？

应该是 非A->B
其实，由条件1.Quore, Inc. must increase productivity, 10 percent over the course of the next two years, or it will certainly go bankrupt。中的‘OR“可以推出if not increase,it will go bankupt.that is  not A->B
由条件2 if a 10 percent productivity increase is possible, then a 20 percent increase is attainable 可以推出 10 percent increase will lead to a 20 percent increase. that is  A -> C ,not C-> not A,
conclude from 1 and 2,not C -> B

crusaders

思考ing...