2. 外语
  3. All actors are exuberant people and all exuberant people are extroverts, but nevertheless it is true that some shy people are ac

All actors are exuberant people and all exuberant people are extroverts, but nevertheless it is true that some shy people are ac

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问题 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:
选项 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.
答案B
解析 设男演员为①，精力充沛的人为②，性格外向的人为③，害羞的人为④，那么本题的逻辑关系就可表达为，所有的①→②，所有的②→③，有一些④→①。由所有的①→②，所有的②→③，我们很容易得出所有的①→③，即所有的男演员都是性格外向的人，所以(A)和(D)可以从段前推理中得到；同理可以推出(C)和(E)与上面段落吻合；从上述的逻辑关系式中我们只能推出有一些害羞的男演员是性格外向的人，而推不出有一些害羞的性格外向者不是男演员，因此(B)是错误的，即(B)为正确答案。
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