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第6部分：完形填空（第52~65题，每题1分，共15分） 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Going on a diet A typical person needs about 1,800 calories per day to stay alive. These calories keep your heart 1_______and your lungs breathing. They keep your organs operating 2_______and, your brain running. They also keep your body warm. A person 3______weight because he or she consumes more calories per day than needed. The only way to lose fat is to 4______the number of calories that you consume per day. This is the basic 5______behind going on a diet. Unfortunately，diets dont 6______for most people. They do lose weight but then go 7______ the diet and put it back. Building a sensible diet and exercise plan is the key to 8______ a consistent weight. You need to figure out how many calories you need in a day and how many you 9______ take in. The next step is to add ，exercise so that you can 10______the number of calories you can consume per day. Exercise charts can show you how many calories different 11______of exercise can burn. Burning 250 or 500 calories per day can 12______a big difference. You can ride an exercise bike while you are watching TV or you can 13______ the stairs instead of the elevator. Find an exercise 14______. Exercise can be a lot easier if there is someone to talk to. Its a good idea to wear firm-fitting clothes if you are on a diet. 15______clothing acts as a reminder of what you are trying to accomplish. | 
