题目内容
【题目】脑筋急转弯
Two fathers and two sons go to the zoo. They take a bus. Everyone buys a ticket(票). But they only buy three tickets. Why?
问题：
【1】How many people are there?___________________________
【2】Who are they? ____________________________
【答案】
【1】Three.
【2】Grandfather, father and son.
【解析】
【1】略
【2】略
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