阅读理解。根据短文内容填空，每空一词。
Now cities are full of cars. Some families even have two or three cars.Parking is a great problem.
Something will have to be done to change it. What will the cars of tomorrow be like? Little cars may
some day take the place of today's big cars. If everyone drives little cars in the future there will be less
pollution in the air. There will also be more space for parking cars in cities, and the streets will be less
crowded .Three little cars can fit (适合) in the space now needed for one car of the usual size. The little
cars will cost much less to own and to drive. Driving will be safe, too. What is more,these little cars can
go about 65 kilometers per hour (每小时). Little cars of the future will be fine for going around a city, but
they will not be useful for long trips. If big cars are still used along with the little ones, two sets of roads
will be needed in the future. Some roads will be used for the fast big cars , and other roads will be
needed for the slow little ones.
1. In cities , _____ is a big problem for those people who have cars.
2. In the _____ little cars will cost much less to own and to drive.
3. A little car's size of tomorrow may be _____ third of today's one car's usual size.
4. If people drive little cars _____ of the big ones,there will be less air pollution.
5. Two sets of roads will be built for the fast big cars and the _____ little ones.

查看答案