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  3. Perhaps like most Americans you have some extra pounds to【B1】______You may even have tried a fad diet or two, but found yourself

Perhaps like most Americans you have some extra pounds to【B1】______You may even have tried a fad diet or two, but found yourself

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问题     Perhaps like most Americans you have some extra pounds to【B1】______You may even have tried a fad diet or two, but found yourself right back where you started. The key to weight loss is regular【B2】______activity. And surprisingly, you don’t have to give up eating or make the gym your second home to see long - term, 【B3】______effects.
    You body needs a certain amount of energy to maintain basic【B4】______such as breathing, blood circulation and digestion. The energy required to keep your organs functioning is referred to the resting or basal metabolic rate.
    Any time you are active【B5】______energy is required. It is obtained from glycogen 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【B6】______of your activity. The higher the intensity, the less your body will pull from the stored carbohydrates. The lower the intensity, the more your body will【B7】______on fat as its fuel.     Aerobic exercise is most【B8】______for weight loss. When you perform aerobic activities you【B9】______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 moderately intense but of long duration, you will burn more fat than if you had【B10】______in a short burst of high - intensity exercise. In short, a brisk 30 - minute walk will burn fat while a 100 -yard sprint will bum glycogen.
[A]positive[B]additional[C]duration
[D]effective[E]shed[F]physical
[G]food[H]functions[I]participated
[J]rely[K]cut[L]repeatedly
[M]uses[N]little[O]obvious
【B6】
选项
答案C
解析 该句句意为“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——”，结合下文提到的…low to moderately intense and of long duration…可知C最符合文意。
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