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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.
【C6】
选项 A、that
B、since
C、when
D、where
答案C
解析 句意为：你的身体工作时需要的能力比你休息时需要的能量多。四个选项：that“那，那个”；since“既然”；when“当”；where“在哪里”。根据空格前边的“wlaen you are working hard”可知所对应的也应该是“when”，所以C项符合句意。
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