问答题

It takes energy to make a car, and it takes energy to run it. Energy is expensive, and in short supply. Using energy causes pollution and contributes to global warming. The energy needed by the car’s engine comes from burning its fuel. Car engines are not very efficient. Only about 20% of the energy from the fuel is used to keep the car moving. The rest escapes as waste heat, or is used for the car’s lights, heater, etc.

【参考答案】

造车要耗能,开车也要耗能。能源很昂贵,且供不应求。消耗能源会造成污染,并导致全球气候变暖。汽车发动机所需的能量依靠燃烧燃......

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