再问Lsat-1-1-14，either－－or －－的表述

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再请教LSAT-TEST1-SEC1-14
Either Perry’s faction or Tucker’s faction, but not both, will win control of the government. If Perry’s faction wins, the nation will suffer economically. If Tucker’s faction wins, the nation will suffer militarily.
Given the statements in the passage, which one of the following statements must be true?
(A) It is possible, but not certain, that the nation will neither suffer economically nor suffer militarily.
(B) If the nation suffers economically, it is certain that Perry’s faction has won control of the government.
(C) It is certain that the nation will suffer either economically or militarily, and also certain that it will not suffer both.
(D) If the nation suffers militarily, it is possible, but not certain, that Tucker’s faction has won control of the government.
(E) If the nation suffers both economically and militarily, it is certain that neither Perry’s faction nor Tucker’s has won control of the government.
题目中either－－or－－－

是否可以推：either A or B－－－>C  then,C 只有AorB两种情况，相当于，C要么是A，要么是B，没有其他情况了。就是C－－－.>A or B

这样的逻辑思路对吗？

dorbear

在either A or B－－－>C中，C代表什么？

robertchu

Yes.
"Either P or T, but not both, will win control" means one of them, butnot both, will win control, and the control will be won by one of them.

我笨，我努力

谢谢两位大侠！

可是robertchu，根据您的思维，那想choice B and C 都该对呀？

我用中文说吧，请斑竹指正我的思维缺陷：

就是 只有P（economically） 和T（military） 可以控制国家 是否可以推出，

1.国家只能有p或是T的一个来控制。  不会有其他选择。就是either－－－or的这个表述

2.国家只能是economically或是military两种状态，不会出现其他的状态，比如中间状态，both economically and military

我觉得eithre－－or－－－是一个逻辑关系表述的词，好好研究一下，会得到一些解题的思路

robertchu

P's win will leads to economic suffering, but the passage does not ruleout the possibility of other types of suffering, such as militarysuffering.

Same for T.  T's win will leads to military suffering, but not necessarily only military suffering.

So, B, C are out.  The correct answer is D.

我笨，我努力

我被绕晕了，请继续指点：

按你这么说还有其他可能性的话，那A和E为什么不对？

lawyer_1

1.P或T必有且只有一个控制政府

2。P赢，则政府必有经济问题。（不排除有军事问题，P赢和军事问题可并存）

3。T赢，则政府必有军事问题。 （不排除有经济问题，T赢和经济问题可并存）

以上命题逆命题不成立，逆否命题成立

A。如果经济问题和军事问题都没，则P和T都没赢（2，3命题的逆否命题）故错（违反1）

B。实质为2命题的逆命题。故错

C。前半句话对，后半句话错。因为可能两个问题都有。

E。后半句话违反1命题

D。即使T改为P也对。

[此贴子已经被作者于2004-6-29 20:06:44编辑过]

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谢谢，明白了