[求助]已解答 谢谢 cxd逻辑support分类第36题

36There is a great deal of geographical variation in the frequency of many surgical procedures—up to tenfold variation per hundred thousand people 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 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 procedure 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 considerer.
(C)There are several categories of surgical procedure (other than hysterectomies, prostatectomies, and tonsillectomies) 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, prostatectomies, and tonsillectomies are representative of surgical procedures in general.

看的不是很明白 e错哪了呢

我选b,对不对? variation和疾病产生因素方面无关

我也认为是B.

题中问到, variation 与 unnecessery procedure的关系, 那答案中必定或明确,或暗指他们的关系.

A C D E, 可以直接排除.

再来说B, 很直接就说出,variation 是与其他的因素无关,除了unnecessary, procedure,

牛哦 答案是b 恩这么一说就明白了