由于MSN 很不稳定,所以将讨论贴搬到CD,也希望有更多的人参与讨论啊! Aug13 讨论结果 1. OG11 - CR - Q116 (pg 621) ----这题关键是the cost be recouped ,B就是说明了不能recouped的一个原因. ----这类题目要根据现有的信息作出判断,不要随便去做假设.
2. A set of numbers has the property that for any number t in the set, t + 2 is in the set. If -1 is in the set, which of the following must also be in the set? I. -3 II. 1 III. 5 A. I only B. II only C. I and II only D. II and III only E. I, II, and III
答案: D 因为集合不像数列,里面不能有重复元素。所以,如果是-3,那么就和-1重复了。所以不能有-3
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