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Often patients with ankle fractures that are stable, and thus do not require surgery, are given follow-up x-rays because their orthopedists are concerned about possibly having misjudged the stability of the fracture. When a number of follow-up x-rays were reviewed, however, all the fractures that had initially been judged stable were found to have healed correctly. Therefore, it is a waste of money to order follow-up x-rays of ankle fracture initially judged stable.

Which of the following, if true, most strengthens the argument?

正确答案: C

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菜鸟再问一个逻辑

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楼主
发表于 2004-5-15 00:02:00 | 只看该作者

菜鸟再问一个逻辑

  often patients with ankle fractures that are stable, and thus do not require surgery, are given follow-up X-rays because their orthopedists are concerned about possibly having misjudged the stablilty of the fracture. When a number of follow-up X-rays were reviewed, however, all the fractures that had initially been judged stable were found to have healed correctly. Therefore, it is a waste of money to order follow-up x-rays of ankle fracture initially judged stable


  support


   A:  doctors who are general practitioners rather than orthpedists are less likely than orthpedists to judge the stability of an ankle fracture correctly


   B:  many ankle injuries for which an initial x-rays is ordered are revealed by the x-ray not to invlove any fracture of the ankle.


   C:  X-rays of patients of many different orthopedists working in several hospitals are reviewed


    D:  the healing of ankle fractures that have been surgically reqired is always checked by means of a follow-up x-ray


    E:  orthopedists routinely order follow-up x-rays for fractures of bone other than ankle bones


    这个题目其实很简单,但我水平太菜,看到答案了,只是模糊的觉得其对,但是似乎还是没理清其中逻辑关系,请NN确认一下答案,并指点一下理由,谢谢谢谢!!!!

沙发
发表于 2004-5-15 00:27:00 | 只看该作者

I choose E.

板凳
发表于 2004-5-15 11:51:00 | 只看该作者

看看睡熊GG的这个总结对你会不会有帮助?

"可以加强的形式有:

(1)A有效并保持;(2)B可能;(3)~A -> ~B (否命题型加强);(4)A -> B (原文改写型加强)"

此题的加强方式正是(1)

地板
发表于 2004-5-15 21:48:00 | 只看该作者
     睡熊的总结原稿在那里???
5#
发表于 2004-5-15 22:16:00 | 只看该作者
我从睡熊答疑的一个帖子上扒下来的,存在自己的电脑里,今早找出来的,原话是:

判断的原则是:对于A -> B,

可以加强的形式有:

(1)A有效并保持;(2)B可能;(3)~A -> ~B (否命题型加强);(4)A -> B (原文改写型加强)

可以削弱的形式有:

(1)A无效或已不保持;(2)B不可能;(3)B -> A (因果关系颠倒型削弱);(4)A -> ~B (否定结论型削弱)

其它形式都不构成加强或削弱。对照你找到的所有例子,看看是不是已经非常清楚了

觉得很简明而且有启发性.至于睡熊有没有进行其它系统的总结,我就不知道了.

6#
发表于 2004-5-16 20:49:00 | 只看该作者

   恩,好总结 !!

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