求解GWD-YN-10 Q22

happycjc108

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?



A.      Doctors who are general practitioners rather than orthopedists are less likely than orthopedists to judge the stability of an ankle 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 ankle 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.

答案是C,无法理解。。。

robertwu82

C说明样本的数量足够大,题目说“a number of follow-up x-rays were reviewed,”，选项C说明，不同医院不同大夫，许多病人的X-rays都被review过。

kaikaichen

感觉是这样解释的：如果这个情况只发生在个别医院或个别医生身上，有可能是因为这些医院和医生的医术高超，判断准确，后续x-ray和最初诊断的结论一致。如果换了个医院或医生，也许他们就没那么高明，后续x-ray检查就是必要的

C就是排除这种可能，说明这是一种普遍情况

szuzhang

关键在于这句话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. 当人们回看这些X光片的时候，发现当初医生的判断是正确的。问题是，我怎么知道你这个X光samples是具有代表性呢？ 如果这些samples全部是来自技术好医生的呢？那肯定不需要照那么多次X光，但如果技术差的医生就需要靠X光了。C选项说被reviewed的X光samples是来自不同医院的不同医生的+原文的a number of =generality+样本容量大=样本representative 加强

前来围观

N年前贴，说下自己的理解：
1.题目说有些医生对自己医术不自信，所以用了follow－up x－ray，结果发现自己之前的诊断是正确的。
2.结合OG官方解释：那有没有可能这些医生本身就医术高明（只是不自信而已），所以他们之前的诊断才屡屡被follow－up x－ray证实是正确的。
3.这么说，以上是对样本是否具有普遍性（representative）的一个质疑，为了消除这种质疑，我们只要说我们的样本具有普遍性就可以了。
4.即C项所说，样本中的x－rays（即文中说的a number of x-rays were reviewed)来自不同医院的不同医生。换言之，不同医院不同医生的样本更具有普适性

little_prince

同意9楼，C说的是many patients，非one single patient。C正确我觉得主要是由于它support了样本足够充分，具有代表性。但我不明白为什么A错了，A：一般的从业医生比外科医生少地正确诊断ankle fracture。我的理解是：因为一般从业医生诊断准确性比外科医生低，所以有可能出现误判，所以更要follow-up x rays。不知道哪里错了，求大家指教。

cuikaka

chelseeea 发表于 2011-5-23 13:44
B 说的是ANKLE受伤照X-RAY的很多无骨裂而题中的讨论范围都不一样patients with ankle fractures that are s ...

同意！               B在否定premise，即在讨论并非题目观众的内容，为无关选项

御寒

robertwu82 发表于 2012-2-21 10:54
C说明样本的数量足够大,题目说“a number of follow-up x-rays were reviewed,”，选项C说明，不同医院不同 ...

同意，中间断掉的逻辑链就是，review的样本量是否足以说明所有的Xray都是浪费            

MAXFIN

og 2016 vb 解释如下：
C Correct. This shows that the sample of x-ray data examined was probably sufficiently representative of cases of ankle fracture judged to be stable by orthopedists.

MAXFIN

robertwu82 发表于 2012-2-21 10:54
C说明样本的数量足够大,题目说“a number of follow-up x-rays were reviewed,”，选项C说明，不同医院不同 ...

好机智。。。点个赞

AnnieFFish

32楼！原来是枚举推理！

蟹蟹前辈们
终于看懂了C的意思

gmat0707

讨论的好透～～谢谢大牛们