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perilea

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 stability 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 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.

选哪个？

misswmp

我选B.  要求X检测的脚扭伤,被揭示与X检测无关.----加强结论:浪费钱重复做X检测

携隐

我选C。原文说When number of follow-up x-rays were reviewed...，没有说明选择的样本是否能代表全部。而C说样本是取自many different orthopedists working in several hospitals，说明了样本的代表性，加强结论。

skyguard2000

我觉得BC都有问题。
原文说对ankle fracture initially judged stable的进行follow-up x-rays是浪费钱，而B说首次x-rays发现没有骨折，没有骨折应该不算ankle fracture initially judged stable吧，我觉得应该是无关条件。
对于C，many different orthopedists，many是多少，可能仍然是一个小的比例。而且我印象中，做这么多的题目，没有发现从样本个数角度进行加强的，从这个角度进行削弱的好象也没有。
如果在考试的时候，我会选B。

skyguard2000

请NN来讨论以下，谢谢！

scorpio0001

总教头的教诲：

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.

skyguard2000

明白了，谢谢！
B应该是无关，原文谈的是patients with ankle fractures that are stable的愈合情况，而B选项是说Many ankle injuries  do not involve any fracture of the ankle。

laplata

这题我一直看不懂B，所以不敢排除
C是能加强的——就怕题目里的most

不过我把题看了N次以后怀疑
题目里和B里讨论的是两种不同的X-ray

follow-up的是医生检查以后拍的
initial是一去医院就照一张
所以B无关

请nn确认一下

WalkByFaith

up!

does any NN think 第 8 楼 is right?

ESeraph

could someone explan this?