Where do cars get their energy from? For most cars,the answer is petrol. 21__________some cars useelectricity. These cars have 22__________motors that get their power from large batteries. In 23__________, thereare even cars that have 24__________an electric motor and a petrol motor. These types of cars are 25__________hybrid ( 混合 ) cars.

Most people tend to think of electric cars as a new 26__________,but they have been around for a longtime. In the 27__________19th and early 20th centuries electric cars were common because the technology for petrol engines was not very advanced. But 28__________the petrol engine became easier to make and more powerful,this type of engines became the most 29__________. Interest in electric cars was high in the 1970s and 1980s because 30__________became very expensive. Recently, electric cars have again become well-liked because people want cars that pollute 31__________.

Electric cars are better than petrol cars 32__________several ways. The biggest benefit is reduced pol- lution. In areas 33__________there is a high percentage of electric cars, pollution is not that serious. The second benefit of electric cars is a 34__________in the dependence on foreign oil. Several countries don' t want to 35__________on oil from other countries. Since electric cars can run on electricity from coal or nu- clear power stations, there is less need to import oil.