36

　　Most Americans would find it hard to imagine what life would look like without cars.

　　37 . The polluted air becomes poisonous and dangerous to health.

　　38 . That’s what several of the large car factories have been trying to do. But to build a clean car is easier said than done. Progress in this field has been slow.

　　Another way is to take the place of the car engine by something else.

　　39 . Many makers believe that it will take years to develop a practical model that pleases man.

　　To prevent the world from being polluted by cars, we’ll have to make some changes in the way many of us live. Americans, for example, have to cut down on the number of their total cars. They are encouraged to travel and go to work by bicycle. Bicycling is thought to help the air clean. But this change does not come easily. A large number of workers may find themselves without jobs if a car factory closes down.

　　40 .

　　Although cars have led us to a better life, they have also brought us new problems.

　　A. Inventors are now working on steam cars as well as electric cars

　　B. Americans know cars very well.

　　C. However, some have realized the serious problems of the air pollution that is caused by cars.

　　D. One way to get rid of the polluted air is to build a car that does not pollute.

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