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  3. 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 yourse

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 yourse

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问题     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【S1】______. The key to weight loss is regular【S2】______activity. And surprisingly, you don’t have to give up eating or make the gym your second home to see long-term,【S3】______effects.
    Your body needs a certain amount of energy to maintain basic【S4】______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,【S5】______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 and【S6】______of your activity. The higher the intensity, the more your body will pull from the stored carbohydrates. The lower the intensity, the【S7】______your body will rely on fat as its fuel.
    Aerobic exercise is most【S8】______for weight loss. When you perform aerobic activities you【S9】______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 burn more fat than if you had【S10】______in a short burst of high-intensity exercise. In short, a brisk 30-minute walk will burn 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
【S6】
选项
答案C
解析 空前的and表明，此处应填与intensity并列的抽象名词，故[C]duration和[N]amount入选。下段中的if your aerobic activity is low to moderately intense and of long duration提示此处应填[C]duration(持续时间)。此句是说，采用这两种能量消耗来源中的哪一种取决于你活动的强度和持续时间。
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大学英语四级

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