科研之友
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摘要
<正>A dog owner claimed that his pet, when given money, would go to the newsstand to buy a paper. His friend handed the dog some money to make it sure. The dog went off, but an hour later he had still not returned with the paper."How much did you give him?"asked the owner."Five dollars.""Well, that explains it. When you give him five dollars, hegoes to a movie.
