标题: 问两道很简单的CR。。求思路 [打印本页] 作者: wwc008love 时间: 2011-6-7 22:53 标题: 问两道很简单的CR。。求思路 No senator spoke at the convention unless he or she was a Democrat.No democrat both spoke at the convention and was a senator. Which of the following conclusions can be correctly drawn from the statements above? A No one but senators spoke at the convention B No Democrat spoke at the convention C Only Democrats spoke at the convention D No senetor spoke at the convention E Some Democrat senators spoke at the convention
为啥选D。。求过程。。
Most parents who are generous are good parents,but some self-centered parents are also good parents.Yet all good parents share one characteristic:They are good listeners If all of the statemetns in the passage are true,which one of the following must also be true? A all parents who are good listeners are good parents B Some parents who are good listeners are not good parents C Most parents who are good listeners are generous D Some parents who are good listeners are self-centered E Fewer self-centered parents than generous parents are good listeners 想知道D是怎么推的谢谢作者: wuqian321 时间: 2011-6-8 18:19
senator 能spoke at the convention 的必要条件是senator is a Democrat。但后面又说No democrat both spoke at the convention and was a senator.即senator不可能是 Democrat。所以选D