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标题: GWD逻辑题请教 [打印本页]

作者: melody远行 时间: 2012-5-4 15:46
标题: GWD逻辑题请教

Often patients with ankle fractures that are stable, and thus do notrequire surgery, are given follow-up x-rays because their orthopedistsare concerned about possibly having misjudged the stability of the fracture. When a number of follow-up x-rays were reviewed, however, allthe fractures that had initially been judged stable were found to havehealed 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 areless 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 revealedby the x-ray not to involve any fracture of the ankle.

C.X-rays of patients of many different orthopedists working in severalhospitals were reviewed.

D.The healing of ankle fractures that have been surgically repaired isalways checked by means of a follow-up x-ray.

E.Orthopedists routinely order follow-up x-rays for fractures of boneother than ankle bones.
这题正确答案是C，可是总想不通，有同学能指点指点吗？

作者: 单调唱 时间: 2012-5-4 16:40
Try to think that some orthopedists-perhaps more experienced, better trained, or employed at a facility with better staff or facilities-may be much better than others at judging ankle fractures. The conclusion drawn from the data is groundless.

If we add the information that the data for the conclusion comes from many orthopedists working at many different hospitals, we have greater assurance that the x-ray data is representative, and the argument will be made much stronger.

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