请教NN两道比较简单的CR。。感谢

wwc008love

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

colasama

确定是GMAT的CR？不喜欢这样的题~~
虽然也挺锻炼脑子的，但不是GMAT的CR出题思路，不建议练这些

lonelyorchid

1 非民主党的参议员都不会在党内大会上发言 2 民主党人没有人同时是参议员且在党内大会上发言
所以逻辑很明显，参议员不再党内大会上发言

1 绝大部分慷慨的家长是好家长，部分自私的家长是好家长 2 所有的好家长都是好听众
所以，有些是好听众的家长是自私的

rikihsu

我的理解是。。。。。

第一题：
1.参议员要发言，除非他是民主党员。
2.没有民主党员他即是参议员又发言。

要发言：非参议员的民主党员
参议员：不能发言
民主党:  要么是参议员但不能发言，要么发言但他不是参议员。

所以选D


第二题：
1. 大多慷慨的家长是好家长
2.一些自私的家长是好家长
3.所有好家长是好的聆听者

A all parents who are good listeners are good parents 不对，most generous以外的generous的家长和some self-centered以外的家长不是好家长
B Some parents who are good listeners are not good parents 不对，那些most generous和some self-centered家长就是好家长
C Most parents who are good listeners are generous 不对，也有可能是self-centered 或者其他是MOST
D Some parents who are good listeners are self-centered 对。
E Fewer self-centered parents than generous parents are good listeners 不对。没有比较标准。