The onboard(车载的) computer makes the decision about when to use a gas engine, when to go electric, and when to use a combination of the two. If you go over 24 km/h, when you step on the gas pedal (油门), you are actually telling the computer how fast you want to go.

　　The electronic motor recharges automatically using a set of batteries. When driving at high speed, the gasoline engine not only powers the car, but also charges the batteries. Any time you use the brake, the electric motor in the wheels will work like a generator and produce electricity to recharge the batteries. As a consequence, the car's batteries will last for around 200,000 miles.

　　51. The author writes this passage mainly to________.

　　A. teach people how to drive a hybrid car

　　B. introduce a new kind of “green” car

　　C. show how to save their gasoline when driving a car

　　D. announce plans to develop hybrid vehicles for China

　　52. The first sentence probably refers to ________.

　　A. there will be more and more green land in China

　　B. China is still young and lacking experience

　　C. China's new cars are combinations of different green models

　　D. China has started producing environmentally friendly cars

　　53. Which of the followings is NOT true?

　　A. The hybrid cars reduce air pollution and oil­shortages.

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