标题: OG 172, 不好意思, 这类题我觉得有点绕不会分析,烦指教! [打印本页] 作者: maggiecookies 时间: 2006-5-1 23:26 标题: OG 172, 不好意思, 这类题我觉得有点绕不会分析,烦指教! 172. 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 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 considered. (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. B 是什么意思呢? 我选D是不是选了对原文的削弱? 请问XDJM的解题思路!! 作者: 二狼神 时间: 2006-5-2 09:07
B是排除他因,这题问的形式不常见,应是属于问前提的.作者: 二狼神 时间: 2006-5-2 09:09
其他选项都是out of scope.
