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    The history teacher is having a lesson, but Frank is thinking about other things. The teacher asks, "Frank, do you know who is the first president(总统)of the United States?" Frank stands up, but he can't answer this question. So the teacher gets angry and shouts, "George Washington!" Frank sits down. "Stand up!" the teacher says angrily, "I don't let you sit down." "Oh, I'm sorry," says Frank. "I thought you called another student."