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  3. What should be done if one wants to gain or lose weight? The process of gaining or losing weight can be explained by compari

What should be done if one wants to gain or lose weight? The process of gaining or losing weight can be explained by compari

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问题     What should be done if one wants to gain or lose weight?
    The process of gaining or losing weight can be explained by comparing your body to your car. Both run【C1】______fuel, food for your body and gasoline for your car. Both【C2】______that fuel, first into heat, then energy, some of【C3】______is used to do work, and some emitted as waste. And【C4】______your car uses more energy when the engine is racing than when it is idling,【C5】______does your body use more energy when you are working hard than【C6】______you are resting.
    For the purpose of this comparison,【C7】______, there is one significant difference between them. Your car cannot store fuel by turning it into【C8】______else; all gasoline not【C9】______remains as gasoline. But your body stores【C10】______energy as fat. When the gas tank is【C11】______empty, the car won’t run; but your body can burn fat to provide more energy.
    Therefore, if you want to gain weight, you must do【C12】______of two things: eat more calories(units of heat, therefore energy), or use less through【C13】______. If you want to lose weight, you do the【C14】______, decrease your intake of calories or increase the amount of energy you spend. There is【C15】______way. Gaining or losing weight is always a relation between intake and output of potential energy.
【C7】
选项 A、however
B、therefore
C、moreover
D、likewise
答案A
解析 句意为：——，为了对比，两者之间有一个很大的差异。四个选项：however“无论如何，但是”；therefore“因此”；moreover“再者，此外，而且”；likewise“同样地，照样”。联系上下文，由人体与汽车的相同，说到不同，此应表转折关系，根据句意，A项符合句意。
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