陈向东的“砖头”第110页 36题

wongpaul

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 conclusion that much of the variation is due to unnecessary surgical procedures, it would be most important to esatablish which of the following?

A)  A local board of review at each hopital examines the records of every  operation to determine whether the surgical procedure was necessary

B) The variation is unrelated to factors(other than the surgical procedures themselves) that influence the incidence of dieases for which surgery might be considered.

C) There are several categories of surgical procedure( other than hy,,,pr...and tonsi...) 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, hy..., pro..., and tonsi... are representative of surgical procedures in general.

题目答案是 B 但是我不理解： unnecessary procedures 和 B 中说的 unrelated factors 有什么关系？ 用斑竹说的排除法这题目应该怎么做？正确的思路应该是怎么样的？

wongpaul

顶一下！谁可以给我解答一下？

wongpaul

明白了,多看几遍再想想各位的意见,就明白了.是题目没怎么看懂! 多谢!