听力原文：F: Jacky, do you want to become a millionaire in the future? M: Why? Of course. But you know, I worry about my grades very much. I think it's the students who get straight A's or maybe it's the children born into wealthy families with brilliant connections who will probably have the chance. F: Then here's some good news for you. A Thomas J. Stanley surveyed 1,300 millionaires before he wrote his new book, The Millionaire Mind. The guy said the average millionaires made B's and C's in college. Their average score was not good enough to get into many top-notch schools. M: You mean most millionaires are not intellectually gifted, not smart enough to succeed? F: Yes. There is no correlation between grade point averages and economic achievement, none. There are some very bright people in the data, but not many. M: If it doesn't rely on natural genius, what makes a millionaire then? F: Millionaires choose careers that match their abilities. They may not have great analytic intelligence, but they are creative and practical. They focus on a goal, take calculated risks and then work harder than most people. M: It's a lesson I should take to heart. How many millionaires have Stanley surveyed before he wrote his book?