摘要
Mark Twain was a famousAmerican writer of novels andshort stories.He liked to tellfunny<sub><</sub>sub>1</sub><sub><</sub>sub><</sub>sub><</sub>sub> </sub>and he also liked toplay jokes on （开玩笑）his friends.One day afriend of his lost his <sub><</sub>sub><</sub>sub>2</sub><sub><</sub>sub><</sub>sub> </sub>and asked MarkTwain to buy the train ticket for him. Mark Twain said, "I’m sorry, but it hap-
