请教两道LSAT难题

Kilroy

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.
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



Answer: D, 请问推导过程，以及做这种类型的题目有什么技巧



During the construction of the Quebec Bridge in 1907, the bridge’s designer, T.C., received word that the suspend span was deflecting downward. Before he could telegraph to freeze the project, the whole cantilever arm broke off and plunged, along with seven dozens of workers in to S.L. river. As a direct result of the inquiry that followed, the engineering “ rules of the thumb” by which thousands of the bridges had been built went down with the Quebec Bridge. 20th century bridge engineers would depend on far more rigorous applications of mathematical analysis.
Which one of the following statements can be properly inferred from the passage?
A) Bridge built before about 1907 were built without thorough mathematical analysis and therefore, were unsafe for public to use.
E) Prior to 1907, the mathematical analysis incorporated in engineering rules of the thumb was insufficient to completely assure the safety of bridges under construction.


Answer: E,  Why not A?

Kilroy

I C，第二题E中有under construction.是解题点

tongxun

2、我对你的解释有保留啊，kilroy。就算不管这个，Bridge built before about 1907 were unsafe for public to use 与was insufficient to completely assure the safety of bridges under construction.比较，后者符合原文。因为原文说造桥工人掉下来了。
1、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.
A) All parents who are good listeners are good parents
将必要条件变成充分条件了。说不定好听众是坏蛋那。
B) Some parents who are good listeners are not good parents
与我在A中的说法一致，但原文没有给出相应的信息（或者上面说的集合）
C) Most parents who are good listeners are generous
generous parents占整个集合的多少，题目也没给相应的信息
D) Some parents who are good listeners are self-centered
E) Fewer self-centered parents than generous parents are good listeners
与C 一样

Kilroy

1 能否把D推导一遍？ 为什么B不行
2 A ......without thorough mathematical analysis 我的理解是没有非常详尽的数学分析，而不是没有经过数学分析，和原文would depend on far more rigorous applications意思应该是一致的

tongxun

1、在做LSAT是不知你有没有发现，有all。。。some。。。也就是全集和子集的题目，选项一般是some。就是取3个集合的交集。
2、A 的内容题目中没有表述。
   题目只是说：would depend on far more rigorous applications。是far more 。明白了吗？就是，原来也有，但并不严格、不足够。