一道所谓真题，请教！

leeon

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

不知是哪里来的问题，Caterpillar MM的所谓真题好像存在着很多错误！

follow-up 形容词，重复的，B说脚踝受伤经过最初的x-ray测定显示并没有什么脚踝骨折，也就是说使用重复的x-rays去判断是没有必要的。

cranberry

文章中所谓的需要重复xray检查的，并非是这种没有骨折的脚踝损伤而是一种虽然骨折但不需手术的类型，这两个没有关系。

jetrong

如果我没有记错，答案应是B!

jetrong

不好意思，我记错了!

这题不是LSAT中的题目，是我在今年6月份的GMAT考试中碰到的一个题目，我选的是B!

caterpillar

以下是引用cranberry在2004-8-30 21:51:00的发言：
b引入了文章中没有的概念，initial x－ray，并不能支持文章的结论，文章的结论不是x－ray is awaste of money，而是the follow－up x－ray is a waste of money

这一点上支持cranberry,initial x-ray和follow-up x-ray应该是两个对应的概念，前者指当初做出判断的时候拍的片子，后者指不做手术，过一段时间后再拍一次片子，用以判断病人的恢复情况。所以B才是无关选项。

再说说我选C的理由。实际上我觉得C应该是一个必要条件，我们对它取非结论就不成立了：如果对follow-up x-ray的review不是对不同医生、不同医院都做了，那这个review的结果就不具代表性，因为有可能不同医院会有不同情况。如果review的结果不具代表性，那在此基础上推出的结论——拍follow-up X光是浪费钱也就不能成立了。C排除了这种可能性，因此支持结论。

mindfree

I pick C. It is more like induction reasoning: from facts to general principle. C simply indicates that the sample is representative of the population.

I do not think A or B is relevant. Practitioner is less likely than orth. does not mean orth. is reliable. First of all, less likely is not equivalent to not as good. Even if practitioner is not as good as orth., the reasoning is still flawed. Tom is doing better than Tim in math does not mean Tom is good. One might score 40 while the other score 39 on a 100 basis.

B has flaws too. The question is not concerned with other injuries. It specifically discusses ankle bone fracture. Other types of injuries do not fall in the reasoning. For example: we require double-check on lugguage that might contain a bomb. You cannot argue that it is not necessary because 99% of the lugguage does not contain a bomb.

caterpillar

谢谢总教头，一般总教头选的答案我直接当做标准答案。

leeon

总教头对B的分析很有道理，脚踝受伤不等于脚踝骨折；这个逻辑错误确实存在从一般到特殊。

C的答案也并不是很好啊！

原文所说的之所以要follow-up x-ray 去检查是因为orthopedists 担心误判了脚踝骨折，C说orthopedists的病人的x-ray已经检查过了，但并不代表orthopedists就不担心了，检查过也有可能是误判，仍然需要follow-up x-ray呢？

[此贴子已经被作者于2004-8-31 9:27:33编辑过]

wanze

总教头以前是独舞，现在是群舞，看的俺们眼都花了。

eSpirit

以下是引用caterpillar在2004-8-31 0:25:00的发言：

这一点上支持cranberry,initial x-ray和follow-up x-ray应该是两个对应的概念，前者指当初做出判断的时候拍的片子，后者指不做手术，过一段时间后再拍一次片子，用以判断病人的恢复情况。所以B才是无关选项。

来说说我的观点，我选B。

针对caterpillar与cranberry说“initial x-ray和follow-up x-ray应该是两个对应的概念，前者指当初做出判断的时候拍的片子，后者指不做手术”，我认为你们理解错了！！请看看原文说的“Many ankle injuries for which an initial x-ray is ordered are revealed by the x-ray not to involve any fracture of the ankle” 。在这里后一个the x-ray指的就应该是前一个x-ray，即被所谓的病人预约要做的x-ray。后一个x-ray其实是把ordered的x-ray实际做了而已。

这样理解后再来说说选项B，B说那些预约了的x-ray（病人已付了钱的），在实际的x-ray做了后表明ankle根本没有fracture。从而说明当初在病人付钱前的医生诊断不正确，所以说it is a waste of money to order follow-up x-rays of ankle fracture initially judge stable。

再来看看C，我认为是否被很多医院的医生看过x-ray的结果不会影响本题要问的，只能说明x-ray上的图片确实说明have healed correctly的正确性。

个人意见！