lsat 13 -1-25

applemusic · 发表于 2003-11-18 08:54:00

25.    All actors are exuberant people and all exuberant people are extroverts, but nevertheless it is true that some shy people are actors.
If the statements above are true, each of the following must also be true EXCEPT:
(A) Some shy people are extroverts.
(B) Some shy extroverts are not actors.
(C) Some exuberant people who are actors are shy.
(D) All people who are not extroverts are not actors.
(E) Some extroverts are shy.
  key - B
but I select D
Show me the detail clearly
Thank you very much !

snow_mountain · 发表于 2003-11-18 10:16:00

要选的是 must also be true EXCEPT

D 很明显是对的。因为是第一句话的逆否命题。

applemusic · 发表于 2003-11-18 22:36:00

是啊，那是答案做了么，哪里有lsat答案的勘误阿

番茄炒蛋 · 发表于 2003-11-19 01:01:00

好像没有看到过哦，有错就上来问吧，没办法了

mythicalman · 发表于 2003-11-24 11:06:00

选B.
这种题画集合图很容易就看出来了。
D是肯定错的，all actors are exuberant people 的逆否命题。
some shy extroverts are not actors

If only shy exuberants are shy extrovert and only shy actors are shy exuberant, then all shy exuberant are actors. So B is wrong. There exists extreme situation that all shy extroverts are actors.

lsat 13 -1-25

lsat 13 -1-25

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