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题库 / OG2017V-CR-160
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?
Doctors who are general practitioners rather than orthopedists are less likely than orthopedists to judge the stability of an ankle fracture correctly.
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.
X-rays of patients of many different orthopedists working in several hospitals were reviewed.
The healing of ankle fractures that have been surgically repaired is always checked by means of a follow-up x-ray.
Orthopedists routinely order follow-up x-rays for fractures of bone other than ankle bones.
这道题说的是，实践中发现fractures that had initially been judged stable were found to have healed correctly，所以follow-up x-rays 是没用的。但此处的疑问就是，真的是所有的fractures that had initially been judged stable 都长好了、再没出现过异常情况吗？
C答案直译就是“在不同医院工作的医生的病人都X光都被review过了”正是在fix题干中的这个weakness，意思是说，“fractures that had initially been judged stable were found to have healed correctly”是在总结了许多医院的不同的医生的病例后下的结论，从统计意义上讲是有代表性的，所以确实是没有必要再开X光的。
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