求助：OG10-172

ran2010zx

There is a great deal of geographical variation in thefrequency of many surgical procedures—up to tenfold variation per hundredthousand between different areas in the numbers of hysterectomies,prostatectomies, and tonsillectomies.

To support a conclusion that much of the variation is dueto unnecessary surgical procedures, it would be most important to establishwhich of the following?

(A) A local board of review at each hospital examines therecords of every operation to determine whether the surgical procedure wasnecessary.

(B) The variation is unrelated to factors (other than thesurgical procedures themselves) that influence the incidence of diseases forwhich surgery might be considered.

(C) There are several categories of surgical procedure(other than hysterectomies, prostatectomies, and tonsillectomies) that areoften performed unnecessarily.

(D) For certain surgical procedures, it is difficult todetermine after the operation whether the procedures were necessary or whetheralternative treatment would have succeeded.

(E) With respect to how often they are performedunnecessarily, hysterectomies, B prostatectomies, andtonsillectomies are representative of surgical procedures in general.

完全木有看明白，E为什么不对呢?求解答，谢谢！

毛毛carina

http://forum.chasedream.com/GMAT_CR/thread-326628-1-1.html

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