一道LSAT逻辑题，请教！

Alana · 发表于 2003-11-9 22:16:00

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.
有点晕！

hedgeforfun · 发表于 2003-11-9 22:37:00

选D
ALL ACTORS ARE EXTROVERTS.
DOESN'T MEAN
ALL PEOPLE WHO ARE NOT EXTROVERTS ARE NOT ACTORS.
比如说，我很EXTROVERT,但我不是演员那

Alana · 发表于 2003-11-10 11:17:00

我也是选D，可是如果我没有看错的话，答案给的是B！
我再找找其他LSAT资料，是否这道题的答案给错了？!
万分感谢 hedgeforfun

joice · 发表于 2003-11-10 12:15:00

All actors are exuberant people and all exuberant people are extroverts

so : all actors are extroverts.

contrapositive: all people who are not extroverts are not actors

so D is must be true.

as0 · 发表于 2003-11-10 12:23:00

joice · 发表于 2003-11-10 12:32:00

the question ask : each of the following must also be true EXCEPT:

D must be true
so answer is B .

Alana · 发表于 2003-11-11 11:23:00

But why isn't B true?

一道LSAT逻辑题，请教！

一道LSAT逻辑题，请教！

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