听力原文： I know a man called John Smith who is a very unusual millionaire. What makes him unusual is that he has no money and no worries that money cannot take care of. But John Smith has thought about this a lot. He says the average millionaire never uses money and always gets other people to pay for taxis or drinks. This is because he is so used to thinking in millions that small amount of money is not worth thinking about. But this does not mean he has no worries. On the contrary, the average millionaire constantly worries about his businesses, his investments and international rates of exchange. A fall in the value of the pound or dollar can give sleepless nights and makes him feel ill. John Smith says that he feels very sorry for millionaires who instead of being masters of their wealth, are slaves of their millions. In one way, however, John Smith always behaves exactly like a millionaire. I mean he never has any money and generally manages to persuade someone else to pay for his drinks. He always makes people happy. He has no worries about economic situation, banks, investments and so on. He does not even give much thought for tomorrow. He is the happiest man I have ever met, and whenever I meet him, he tells me 'In money I am not rich, but in peace of mind I am a millionaire'. What is John Smith?