Conventional cars have large engines to deal with driving uphill and accelerating. Hybrid cars have much smaller petrol engines, improved by electric motors when needed, so they use less petrol. Another way that fuel consumption is cut is by a system of “regenerative (再生的) braking”. The electric motor is used to slow down the car, rather than conventional brakes. The energy produced by slowing the car is changed into electrical power, which is automatically stored in the battery. In effect, the battery recharges when you brake. In conventional cars the energy produced when braking is wasted.

　　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。

　　4．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

【2017届高考英语一轮复习考点落实练：Unit 17《Laughter》（北师大版含解析）】相关文章：

★ 【浙江专用】2014届高考英语一轮复习课时作业(十一)必修3Unit 1《Festivals around the world》

★ 2017届高考英语二轮复习大题冲关秘籍语法填空：创新押题（含解析）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修6 unit3《A healthy life》

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 3 B卷 Word版含解析

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练：6（含解析）

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（24）模块8 《Unit 24 Society》（含解析） 北师大版必修1

★ 2017届高考英语二轮复习课时训练：3（含解析）

★ 【三维设计】2017版（江苏专用）二轮复习练习：必修1 Unit 1《School life》课时跟踪检测B卷（含解析）

★ 2017届高考英语二轮复习课时训练：12（含解析）

★ 【浙江专用】2014届高考英语一轮复习课时作业(二)必修1Unit 2《English around the world》