Often patients with ankle fractures that are stable, and thus do not require surgery, 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 healed correctly. Therefore, it is a waste of money to order follow-up x-rays of ankle fracture initially judge stable.
Which of the following, if true, most strengthens the argument?
A. Doctors who are general practitioners rather than orthopedists are less likely than orthopedists to judge the stability of an ankel fracture correctly.
B. 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.
C. X-rays of patients of many different orthopedists working in several hospitals were reviewed.
D. The healing of nakle fractures that have been surgically repaired 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.
我选C。我觉得C可以看成是排除他因，说明review是有代表性的。
E. Orthopedists routinely order follow-up x-rays for fractures of bone other than ankle bones.
我选C。我觉得C可以看成是排除他因，说明review是有代表性的。
我觉得毛虫分析的很有道理.
不过为什么么不能是E呢? 说这些整形医师不管对什么骨折都routinely order照X光.---说明这些整形医师提的建议并没有针对性,因此是waste.
现在我自己都有点糊涂了......
一道所谓真题?
这个题目是LSAT上的逻辑题啊？
我选B。题目说因为x-ray 的结果总是和整形师最初的诊断一致，所以拍片没必要，是浪费钱的。
要支持这个结论，就是要说明x-ray 的确无法判断实际受伤的情况。而B提到大部分的脚踝受伤情况经x-ray 验证没有任何的骨折。说明使用x-ray 没用。即支持了原文的结论。
May I ask what is the key to this question?
I have searched the answer in Daquan, but failed.
AND could anybody explain what's the meaning of branch C?
一道所谓真题?
这个题目是LSAT上的逻辑题啊？
Jetrong gg, 你能提供一下答案吗?
好让我们这些人的心不要老悬在这呀...
B.
A，错误的比较。C、D、E都是无关选项。
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。
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!
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。
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.
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？
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！
坚定的选B，多少人检查跟检查本身浪不浪费钱没有必然联系，赞同espirit的，这里应该是异因同果的加强
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