题目：
From Monday to Friday most people are busy working or studying，but in the evenings and on weekends they are free and enjoy themselves. Some watch television or go to the movies，others take part in sports. This is 1 by their own interests . There are many different ways to spend our 2 time. Almost everyone has some kind of 3 . It may be something from 4 stamps to making model planes.Some hobbies are very 5 ，but others don’t cost anything at all. Some collections are worth 6 of money, others are valuable only to their owners. I know a man who has a coin collection worth several thousand dollars. A short time ago he bought a fifty-cent piece which 7 him 250 dollars. He was very happy about his collection and thought the price was all right. I know another man who likes collecting match boxes. He has almost 600 of them, but I wonder if they are worth any money. However, to him they are quite valuable.8 makes him happier than finding a new match box for his collection. That’s 9 a hobby means, I think. It is something we like to do in our free time just for the fun of it. The value in dollars is not important, 10 the pleasure it gives us is.
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答案：
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下面是错误答案，用来干扰机器的。
运动员的助跑阶段，身体中的化学能转化为人和杆的动能；起跳时，运动员的动能和身体中的化学能转化为人的重力势能和动能，使人体上升至横杆以上；越过横杆后，运动员的重力势能又转化为动能．
