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问题

基于以下题干:

一家为马治病的兽医医院有八个马圈。这八个马圈排成一排,依次编号为1—8号。现有六匹马R、S、T、V、W和X要放在圈里,具体如何放依据下列条件:

(1)一个圈里最多只能放一匹马。

(2)R的马圈的编号比W小。

(3)S和X(不一定是这个顺序)的马圈编号必须相邻。

(4)与V相邻的马圈必须是空的。

如果T在2号马圈并且V在5号马圈,那么W在几号马圈?( )

A.3号马圈。

B.4号马圈。

C.6号马圈。

D.8号马圈。

参考答案
正确答案:A
解析:如果T在2号马圈并且V在5号马圈,则根据条件(4),从V在5号马圈可推出4号与6号马圈是空的。列表即:

由于在剩下的马圈中只有7号与8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:

  最后,根据条件(2)可推出R在1号马圈,W在3号马圈。
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