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标题: LSAT－18－2－11 [打印本页]

作者: suibian 时间: 2005-1-2 09:26
标题: LSAT－18－2－11

11. The situation has gotten worse. Unless Elizabeth goes I must go. But she will not go if I stay. So we will both have to go.

What is the flaw in the reasoning above?

(A) The first claim, that the situation has gotten worse, is irrelevant.

(B) A possible course of action is overlooked.

(D) The conclusion refers to a possibility that is not explicitly referred to in any of the premises.（B）

(E) Insufficient information is given about the circumstances

这道题目也是很多人讨论过的。但还是有疑问。

Unless Elizabeth goes I must go。应该看作 B, unless A==== neg B ------A

or B, unless A==== neg A------B

I not go ------Elizabeth go

Elizabeth not go --------I go

But she will not go if I stay. I not go--------Elizabeth not go

逆否： Elizabeth go-------- I go

但结论是 we both have to go. 是说 E go ------I go , I go------ E go (充分必要)吗？

所以答案是B A possible course of action is overlooked？

那这个possible overlooked course 是指 I go ------ E go 吗？

如果是这样推出来的话，那前面的Unless Elizabeth goes I must go这句话好像根本没什么作用嘛！

作者: lawyer_1 时间: 2005-1-3 00:16
根据原文假设句：Elizabeth not go ------>I go。Elizabeth go-------- I go。可以有的情况是we both go or only I go。但原文的结论却只是一种情况。

作者: suibian 时间: 2005-1-7 01:46

哦，我本来想这两个选项是矛盾的，怎么可能同时发生呢，所以就排除了。是我多想了。

3x, lawyer!

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