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Each year there is an increasing number of cars on roads and streets as millions of new cars and trucks are produced. One out of every six Americans works at putting together the parts of cars, driving trucks, building roads or filling cars and trucks with gas. Americans won’t live without cars!

Most Americans  would  find  it  hard  to  think  what  life  would  look  like  without  cars. However, some have realized the serious problems of the air pollution that is caused by the car.

The polluted air becomes poisonous and dangerous to health.

One way to get rid of the polluted air is to build a car that does not pollute. 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. Inventors are now working on steam cars as well as electric cars. 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 keep 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. Thus the problem of air pollution would become less important than that of unemployment.

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

1.How many ways to get rid of air pollution are suggested in this article by the writer?

A. Four.   B. Three.

C. Two.   D. One.

2.If the number of cars is cut down, the most serious problem to American workers is_______.

A. to have no work to do   B. to keep the air clean

C. to get a better life   D. to go to work by bike

3.What is the conclusion(结论) of the writer?

A. Bicycling is the only way out.

B. The number of cars must be cut down.

C. Cars bring us nothing but serious problems.

D. Cars bring us not only a better life but serious problems.

4.To reduce pollution, we’ll have to  make some  changes in the  way many of us live, EXCEPT that   ______.

A. Americans have to cut down on the number of their total cars.

B. People are encouraged to travel and go to work by bicycle.

C. The number of cars on the roads should be limited every day.

D. People should build more roads and fill cars and trucks with gas.

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