题目内容：
根据以下资料，回答题。Energy of the Body
In some ways, the human body is both like a furnace and like an engine. It must have fuel to produce heat as a furnace has. It must have fuel to produce motion and (51)as an engine does. The nutrients which (52)energy best are carbohydrates and fats. Protein can also be used as fuel. Minerals, vitamins, and water, as extremely valuable to the body, cannot be used as fuel.
If the body takes (53)more carbohydrates (54)are used for energy, the (55)is stored. Two storage places are the liver and muscles. But there is a limit to the amount of carbohydrates they can (56). When they are filled and they always might be for you to feel your best, excess carbohydrates are changed to fat and (57)around the body.
If the body does not take in a (58)amount of food, it will use its stored fat for energy. If you didn’t eat at all, the body would use up all the stored fats and (59) it would use its own protein in order to keep (60)as long as possible. Therefore, the (61) amount of food you eat should be in (62) with your energy requirements. It is not necessary, (63), for you to count calories and weigh food. (64) a person is the right weight, it is safe to (65)that he is eating enough.
A.work B.rest C.repair D.promote
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