【求助】cxd-74

susander

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 statements 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 parent.
(C) Most parents who are good listeners are generous.
(D) Some parents who are good listeners are self-centered.（D）
(E) Fewer self-centered parents than generous parents are good listeners

在下想问问  为什么B错呢？

大部分慷慨的父母是好父母，但是一部分自我中心的父母也是好父母，所有的好父母都是好听众。

“B．有一些是好听众的父母不是好父母”怎么会不对呢。。。

augest

LZ以后碰到这样的题在纸上用圈圈画一个图，久了就回在脑子里也形成一个图。
B的反例是一个极端情况，那就是good parents 跟 good listeners 的圆圈重合,

susander

实际上。。。我画圈圈了，但是B选项里面有个‘Some’

意思就是有部分重合  这很合理嘛。。。

franker

题目问的是 must be ture.... 所以。。。就不合理了。

susander

大部分慷慨的父母是好父母，但是一部分自我中心的父母也是好父母，所有的好父母都是好听众。

“B．有一些是好听众的父母不是好父母”怎么会不对呢。。。