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完形填空。(共15小题，每小题1分，计15分) 通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选出一个最佳选项。 Many teenagers have hobbies. But sometimes these hobbies can get in the way of schoolwork, and parents 41 worry about their childs 42 at school. Teenagers often think they should be allowed to practice their hobbies as much __43 they want. Do you agree? Liu Yu, a fifteen-year-old boy from Shandong, is a running star. He is 44 his school running team and has always wanted to be a professional athlete. 45 , his parents wont allow him to train as much as he would like to. Of course we want to see Liu Yu 46 his dreams, says Mr. Liu, and we know how 47 he loves running. Thats great, and my wife and I have watched him in every one of his races. We have nothing against 48 ! But we do think 49 our son needs to be realistic. Now he is getting older, he needs to think about 50 will happen if he _51 become a professional runner in the end . Liu Yu doesnt really agree. Well, I think I should be allowed to make decision for myself, he says. My parents have always taught me the importance of working hard and not just to do what I enjoy. I understand this. But Im serious about running. 52 a professional runner is the only thing I have ever wanted to do. Mr. And Mrs. believe that Liu Yu should study hard in the evenings, and so they dont allow him to practice 53 on school nights. I know this might seem strict, says Mrs. Liu, but we think were doing the right thing. He has to understand that very 54 people can become professional athletes. Its very difficult dream to achieve. We dont allow him to practice every day because we think he needs to spend time on his homework. | 
