A lady,her brother,her son and her daughter (all related by birth) playedvolleyball.The worst player's twin (who is one of the four players) and thebest player are of opposite ***.The worst player and the best player are of the same age.Who cannot be

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Alady,herbrother,hersonandherdaughter(allrelatedbybirth)playedvolleyball.Theworstplayer''stwin(whoiso

A lady,her brother,her son and her daughter (all related by birth) playedvolleyball.The worst player's twin (who is one of the four players) and thebest player are of opposite ***.The worst player and the best player are of the same age.Who cannot be
A lady,her brother,her son and her daughter (all related by birth) played
volleyball.The worst player's twin (who is one of the four players) and the
best player are of opposite ***.
The worst player and the best player are of the same age.
Who cannot be the worst player(s)?
A) brother only B) daughter only
C) son and daughter only
D) lady and daughter only
E) lady only

A lady,her brother,her son and her daughter (all related by birth) playedvolleyball.The worst player's twin (who is one of the four players) and thebest player are of opposite ***.The worst player and the best player are of the same age.Who cannot be
先翻译一下：
一位女士和她哥哥（或弟弟）、儿子和女儿（都有血缘关系）一起打排球.最差选手的孪生同胞（此人是四位选手之一）和最佳选手的性别不同.最差选手和最佳选手同龄.
谁不可能是最差选手?
A)哥哥（或弟弟）
B)女儿
C)儿子和女儿
D)女士和女儿
E)女士
分析：lady和brother可能是twin,son和daughter也可能是twin.
（1）假设lady是最差选手,她的孪生同胞是brother,性别为男,由“最差选手的孪生同胞（此人是四位选手之一）和最佳选手的性别不同”,可知最佳选手是daughter.此时“最差选手和最佳选手同龄”就产生了矛盾,故lady不可能是最差选手.
（2）假设brother是最差选手,他的孪生同胞是lady,性别为女,由“最差选手的孪生同胞（此人是四位选手之一）和最佳选手的性别不同”,可知最佳选手是son.此时“最差选手和最佳选手同龄”就产生了矛盾,故brother不可能是最差选手.
若son和daughter是twin,此时lady和brother可以不是twin,即brother可能比lady小,就可能和daughter还有son同龄
（3）假设daughter是最差选手,她的孪生同胞是son,性别为男,由“最差选手的孪生同胞（此人是四位选手之一）和最佳选手的性别不同”,可知最佳选手是lady.此时“最差选手和最佳选手同龄”就产生了矛盾,故daughter不可能是最差选手.
（4）假设son是最差选手,他的孪生同胞是daughter,性别为女,由“最差选手的孪生同胞（此人是四位选手之一）和最佳选手的性别不同”,可知最佳选手是brother.此时“最差选手和最佳选手同龄”是有可能的,故son可能是最差选手.
所以个人认为lady、brother和daughter都不可能是最差选手,没有答案可选.

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