英语四级考前每日一练(7)

　　Perhaps like most Americans you have some extra pounds to shed. You may even have tried a fad(时尚) diet or two, but found yourself right back where you 47 . The key to weight loss is regular 48 activity. And surprisingly, you don't have to give up eating or make the gym your second home to see long-term, 49 effects. Your body needs a certain amount of energy to maintain basic 50 such as breathing, blood circulation and digestion. The energy required to keep your organs functioning is referred to as the resting or basal metabolic rate.
　　Any time you are active, 51 energy is required. It is obtained from glycogen (糖原) and fat stored in the blood, liver, and muscles. The key to losing weight is to draw on the fat rather than on the carbohydrate reserves. Which of the two energy sources you use depends on the intensity and52 of your activity? The higher the intensity, the more your body will pull from the stored carbohydrates. The lower the intensity, the 53 your body will rely on fat as its fuel.
　　Aerobic exercise is most 54 for weight loss. When you perform aerobic activities you 55 contract large muscle groups such as your legs and arms. Walking, running, rollerblading, swimming, dancing, and jumping jacks are all forms of aerobic activity. Surprisingly, if your aerobic activity is low to moderately intense and of long duration, you will bum more fat than if you had 56 in a short burst of high-intensity exercise. In short, a brisk 30-minute walk will bum fat while a 100-yard sprint will burn glycogen.
　　A．positive F．physical K．started
　　B．additional G．activities L．repeatedly
　　C．duration H．functions M．less
　　D．effective I．participated N．amount
　　E．more J．efficient O．obviously