请教mindfree一lsat-5-2-4

mzyzhu

斑竹还未休息，称此机会讨教一题， 谢谢！


Q4. A work of architecture, if it is to be both inviting and functional for public use, must be unobtrusive, taking second place to the total environment. Modern architects, plagued by egoism, have violated this precept. They have let their strong personalities take over their work, producing buildings that are not functional for public use.

Which one of the statements below follows logically from the statements in the passage?

(A) Unobtrusive architecture is both inviting and functional.

(B) Modern architects who let their strong personalities take over their work produce buildings that are not unobtrusive.

(C) An architect with a strong personality cannot produce buildings that functional well for the public.

(D) A work of architecture that takes second place to the environment functions well for public use.

(E) A work of architecture cannot simultaneously express its architect’s personality and be functional for public use.

答案是B, 但是按照充分条件必要条件来推理，B似乎也不对。

原文可简写为两个推理：
(1) if a architecture is both inviting and functional for public useè it is unobtrusive。推理可表示both inviting and function for public use是unobtrusive的充分条件。
(2) if modern architects let strong personality take over their worksètheir works will no be functional for public use. Strong personality take over the work是not functional for public use的充分条件。

Answer B说strong personality take over the workènot unobtrusive的逻辑在于：strong personality take over the work==〉not functional for public use==〉not unobtrusive。

我认为在推倒not functional for public use==〉not unobtrusive有问题。根据（1） if A and B, then C.那么能否说if not B, then not C.原命题的部分否命题似乎不成立。

是我理解有误还是其他问题，请指教。

mindfree

First of all, you can use POE to eliminate A,C,D,E.

The reasonings in the passage, as you pointed out, are:
"both inviting and function for public use" (1)--> unobtrusive (2)
"strong personality take over the work" (3)-->not functional for public use (not 1)
(2) is required for (1) and (3) is sufficient for Not (1)

From the reasoning above, we cannot get (3)-->(2), as (2) might not be the only reason for (1). In another word, (2) is not sufficient for (1). However, in the passage it says "Modern architects, plagued by egoism, have violated this precept". So we can safely assume that the only reason that works from those modern architects who let their strong personality to take over their work are not functional is that they are unobtrusive. So B is right.

renprince

以下是引用mindfree在2003-6-6 13:43:00的发言：
However, in the passage it says "Modern architects, plagued by egoism, have violated this precept". So we can safely assume that the only reason that works from those modern architects who let their strong personality to take over their work are not functional is that they are unobtrusive. So B is right.

这样不就是a--->b
非a--->非b
i think it is not safe to assume that the only reason is~~~~~~~~

mzyzhu

thanks for the explanation by mindfree and renprince.

At least one point I can learn from you is always focus the line of reasoning from within. however, you may agree with my point that even B is not a perfect answer that can withstand scrutiny.

mindfree

Without the sentence I pointed out, B is not an answer at all.

laserlee1

老实讲mindfree的答案蛮牵强附会的。  B是典型的X推Y  负X推负Y的错误，更何况是要 inviting * functional for public use 才可以推 unobtrusive  ，怎么可以得出B的结论？

本题5个答案都不好。。。但一定要选的话 其实是E相对顺眼的

LES

以下是引用mindfree在2003-6-6 13:43:00的发言：
First of all, you can use POE to eliminate A,C,D,E.

The reasonings in the passage, as you pointed out, are:
"both inviting and function for public use" (1)--> unobtrusive (2)
"strong personality take over the work" (3)-->not functional for public use (not 1)
(2) is required for (1) and (3) is sufficient for Not (1)

From the reasoning above, we cannot get (3)-->(2), as (2) might not be the only reason for (1). In another word, (2) is not sufficient for (1). However, in the passage it says "Modern architects, plagued by egoism, have violated this precept". So we can safely assume that the only reason that works from those modern architects who let their strong personality to take over their work are not functional is that they are unobtrusive. So B is right.

mindfree, 请问什么是POE？第一次听说。谢谢！

kingsoft

    无关选项排除法，我猜的

    呵呵，正好看到一个证据http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=53183&page=1

[此贴子已经被作者于2004-6-12 21:11:40编辑过]

LES

谢谢kingsoft，可是mindfree 为什么不回复啊？

lwei1016

以下是引用LES在2004-6-12 21:36:00的发言：
谢谢kingsoft，可是mindfree 为什么不回复啊？

估计是忙到了啊!