题目：
| 完形填空. | ||||
| From Monday to Friday most people are busy working or studying, but in the evening and weekends they are free and __1__ themselves. Some watch television or go to the movies, others __2__ sports. This is decided by their own __3__ . There are many different ways to spend our __4__ time. Almost everyone has some kind of __5__, it may be something from collecting stamps to __6__ model planes. Some hobbies are very __7__, but others don't cost anything at all. Some collections (收藏) are worth __8__ of money, others are valuable (有价值的) only to their owners. I know a man who has a coin collection worth several __9__ dollars. A short time ago he bought a rare (罕见的) fifty cent piece which __10__ him $250! He was very happy about this collection and thought the price was all right. On the other hand, my youngest brother collects match boxes. He has almost 600 of them, but I wonder __11__ they are worth any money. Howeyer, __12__ my brother they are quite valuable. __13__ makes him happier than to find a new match box for his collection. That's what a hobby means, I think. It is something we __14__ to do in our free time just for the __15__ of it. The value in dollars is not important, but 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。
48×（1-60%），=48×0.4，=19.2（元）；便宜了19.2元，不是8元，所以题干中的说法是错误的．故答案为：×．
O＋O2 ②NO＋O3→NO2＋O2 ③NO2＋O→NO＋O2 
