Cars for Tomorrow

　　A kind of little cars may someday take the place of(代替)today’s big ones．People will like this kind of small cars more and more．The car is as small as a bike but can carry two people in it．Everybody can drive them to schools and parks．

　　If everyone drives such cars in the future，there will be less pollution(污染)in the air．There will also be more space(空间)for all the cars in cities，and the streets will have more space for people to walk．Three such cars can fit in the space now needed for one car of the usual size．

　　The little cars of the future will cost much less money to own and to drive．These little cars can go only 65 kilometers an hour，so driving will be safer,too．The cars of the future will be fine for getting around city，but they will not be useful for a long trip．This kind of cars can save a lot of gasoline(汽油)．They will go 450 kilometers before needing to stop for more gasoline．

　　If big cars are still used along with the small ones，two sets of roads will be needed in the future．Some roads will be needed for the big，fast cars and other roads will be needed for the smaller, slower ones．

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