One CR. very difficult for me! Help, please

redpot

There is a great deal of geographical variation in the frequency of many surgical procedures-up to tenfold variation per hundred thousand between different areas in the numbers of hysterectomies, prostatectomies, and tonsillectomies.
To support a conslusion that much of the variation is due to unnecessary surgical procedures, it would be most important to establish which of the following?

A. A local board of review at each hospital examines the records of every operation to determine whether the surgical procudure was necessary.
B. The variation is unrelated to factors(other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered.
C. There are several categories of surgical procedure (other than hysterectomies, pro... and ton...) that are often performed unnecessarily.
D. For certain surgical procedures, it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded.
E. With respect to how often they are performed unnecessarily, hysterectomies, pro... and ton... are representative of surgical procedures in general.

ded.

tongxun

本题难在B、E的区别上。B