单选题桌子上的蛋糕不知被谁吃了,以下是屋内四个人的回答。甲说是乙吃的。”乙说是丁吃的。”丙说:“我没吃。”丁说乙在撒谎。”这四人中只有一人说了真话,由此可以判断()A甲说了真话,是乙吃的B乙说了真话,是丁吃的C丙说了真话,是甲吃的D丁说了真话,是丙吃的
单选题
桌子上的蛋糕不知被谁吃了,以下是屋内四个人的回答。甲说是乙吃的。”乙说是丁吃的。”丙说:“我没吃。”丁说乙在撒谎。”这四人中只有一人说了真话,由此可以判断()
A
甲说了真话,是乙吃的
B
乙说了真话,是丁吃的
C
丙说了真话,是甲吃的
D
丁说了真话,是丙吃的
参考解析
解析:
考查命题的基本逻辑性质。乙的话是丁的话的负命题,必有一真一假。又因为只有一个人说了真话,证明不是乙就是丁。这样就排除了A和C两个答案。如果B真,那么丙说自己没吃,也是真话,题目说就一个人说真话,所以B是错误的,故选D。
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