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A teacher and a farmer are sitting on a plane. They both feel bored.
The teacher says to the farmer， “Let’s ask each other a riddle（谜语）. If one of us can’t answer it， he should give the other $100.”
“That’s not fair（公平的）！ You know more than me，” says the farmer.
The teacher says， “OK. If you don’t know the answer， you pay me $50. If I don’t know， I pay you $100. Do you agree？”
“Yes， let’s play. I’ll go first.”
The farmer says， “Here is the riddle. What has three legs when it walks， but only two legs when it flies？”
The teacher thinks for a while and gives up（放棄）. He pays the farmer $100 and says， “Tell me， what is the answer？”
“I don’t know， so I will pay you $50.”
The teacher says to the farmer， “Let’s ask each other a riddle（谜语）. If one of us can’t answer it， he should give the other $100.”
“That’s not fair（公平的）！ You know more than me，” says the farmer.
The teacher says， “OK. If you don’t know the answer， you pay me $50. If I don’t know， I pay you $100. Do you agree？”
“Yes， let’s play. I’ll go first.”
The farmer says， “Here is the riddle. What has three legs when it walks， but only two legs when it flies？”
The teacher thinks for a while and gives up（放棄）. He pays the farmer $100 and says， “Tell me， what is the answer？”
“I don’t know， so I will pay you $50.”