In 1928, Ferdinand Porsche built an experimental hybrid car. The first mass­produced hybrid car, the Toyota Prius, came out in Japan at the end of 1997. However, hybrid cars became available in the USA only in 1999. As they use less fuel, hybrid cars are cheaper to run. There are also many voices in place to encourage people to buy them. In some countries, hybrid car owners pay a lower rate of tax, and don?t have to pay on certain roads. In some cities, hybrid cars are allowed to park for free.

　　语篇解读：本文是一篇科普说明文。文章介绍了以汽油和电为动力的混合动力车，它是一种节约能源的汽车。9．Hybrid cars consume less energy than conventional cars because hybrid cars ________.

　　A．have large engines to deal with accelerating

　　B．have conventional brakes to slow down the car

　　C．have no energy consumption when stopping

　　D．have electric power to assist when needed

　　解析：选D　细节理解题。根据第三段第二句“Hybrid cars have much smaller ... use less petrol.”可知，混合动力车必要时有电力支持，所以消耗较少的能源。

　　10．In regenerative braking, ________.

　　A．the conventional brakes are used to slow down the car

　　B．energy wasted in conventional cars is stored in the battery

　　C．the battery charges itself when the car is accelerating

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