A.The mayor of Manchester is a woman. B.There is a mayor in Manchester. What is the semantic relation of these two sentences?

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问题 A.The mayor of Manchester is a woman.
B.There is a mayor in Manchester. What is the semantic relation of these two sentences?

选项 A、Entailment
B、Presupposition
C、Contradiction
D、Tautology

答案B

解析 如果我们说A预设(presuppose)B,是指B是A成立的先决条件,从逻辑上讲,如果A为真,则B必定为真;如果A为假,则B仍然为真。该题中,A句“曼彻斯特的市长是女士”如果是真的话,则B句“曼彻斯特有市长”则一定是真;即使A句是假,即“曼彻斯特的市长不是女士”,那么B句依然成立,因为只有曼彻斯特有市长,才能讨论其是男是女。因此A预设B。
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