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  3. Where do cars get their energy from? For most cars, theanswer is petrol.【C1】________ some cars use electricity. These cars

Where do cars get their energy from? For most cars, theanswer is petrol.【C1】________ some cars use electricity. These cars

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问题     Where do cars get their energy from? For most cars, theanswer is petrol.【C1】________       some cars use electricity. These cars have【C2】________motors that get their power from large batteries. In【C3】________,  there are even cars that have【C4】________an electric motor and a petrol motor. These types of cars are【C5】________hybrid (混合)  cars.
    Most people tend to think of electric cars as a new【C6】________, but they have been around for a long time. In the【C7】________19th and early 20th centuries electric cars were common because the technology for petrol engines was not very advanced. But【C8】________the petrol engine became easier to make and more powerful, this type of engines became the most【C9】________. Interest in electric cars was high in the 1970s and 1980s because【C10】________became very expensive. Recently, electric cars have again become well-liked because people want cars that pollute【C11】________
    Electric cars are better than petrol cars【C12】________several ways. The biggest benefit is reduced pollution. In areas【C13】________there is a high percentage of electric cars, pollution is not that serious. The second benefit of electric cars is a【C14】________n the dependence on foreign oil.     Several countries don ’ t want to【C15】________on oil from other countries. Since electric cars can run on electricity from coal or nuclear power stations, there is less need to import oil.
【C9】
选项 A、difficult
B、dangerous
C、comfortable
D、popular
答案D
解析 Difficult困难的，dangerous危险的，comfortable舒适的，popular普及的。接着上一条，汽油发动机得以改善之后，以汽油为动力的车得以普及。选项D正确。
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