Once， an American who was in a village in Africa got on a bus and the driver held out to him a yellow ticket. "You'd better buy a yellow ticket，" said the driver. "It's one dollar.I have two other kinds. The red one is fifty cents and the green one is ten cents."
"Green one， please，" said the man. The bus started. Now it was growing dark and the bus began to go up a hill. Suddenly it stopped. “Yellow ticket passengers，” said the driver， "stay in the bus， please. Red ticket passengers get out and walk. Green ticket passengers get out， shut the door and push the bus."
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