问题
单项选择题
甲说乙胖，乙说丙胖，丙和丁都说自己不胖。如果四人陈述只有一人错，那么谁一定胖
A．仅甲
B．仅乙
C．仅丙
D．仅乙和丙
答案
参考答案：B
解析： 乙说“丙胖”和丙说“丙不胖”是一对矛盾命题，不能同真也不能同假，所以错话一定是出在他们两人中间，因此，甲的话和丁的话一定是对的，所以，乙胖，丁不胖，即选项B一定正确。
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甲说乙胖，乙说丙胖，丙和丁都说自己不胖。如果四人陈述只有一人错，那么谁一定胖
A．仅甲
B．仅乙
C．仅丙
D．仅乙和丙
参考答案：B
解析： 乙说“丙胖”和丙说“丙不胖”是一对矛盾命题，不能同真也不能同假，所以错话一定是出在他们两人中间，因此，甲的话和丁的话一定是对的，所以，乙胖，丁不胖，即选项B一定正确。
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