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问题

如果3号马圈和7号马圈是空的并且W在5号马圈,那么下列哪一项必定是真的?( )

A.R在1号马圈。

B.S在1号马圈。

C.T在6号马圈。

D.V在2号马圈。

参考答案
正确答案:C
解析:如果3号马圈和7号马圈是空的并且W在5号马圈,则可列出下表:

由于在剩下的马圈中只有1号与2号是相邻的,根据条件(3)的要求,S和X必须放在这两个马圈。即:

  现在,根据条件(2)可推出R在4号马圈。根据条件(4)可推出V在8号马圈。于是,最后剩下的T只能在6号马圈。
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