一道LSAT,转不过来,大家给看看

poppyxams

lsat 13 -1-25
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

为什么选B呢????

poppyxams

顶一下

jh1904

All actors are exuberant people and all exuberant people are extroverts -> all actors are extroverts-> all people who are not extroverts are not actors (D)

Some shy people are actors -> some actors are exuberant people (extroverts) and shy (C)<-> some shy people are extroverts. (A and E)

From the stem, we can only infer that some shy extroverts are actors but we don't know whether all shy extroverts are actors or not.

isMindy

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