Each year the number of cars on roads and streets is becoming larger and larger. Millions of new cars are produced. One out of every six Americans works at putting together the parts of cars, driving trucks, building roads or filling cars with gas. Americans won’t believe without cars!
Most Americans find it hard to think what life would be without a car. However, some have realized the serious problem of air pollution caused by cars. The polluted air is poisonous and dangerous to health.
One way to reduce the polluted air is to build a new kind of car. Some large car factories are trying to do. But to build a clean car is easier said than done. It develops very slowly.
Another way is to take the place of the car engine (发动机) by something else. Engineers are now working on some new cars. It will take years to develop it.
To prevent the world from being polluted by cars, we’ll have to make some changes in the way of life. Americans, for example, have to cut down the number of their cars. They are encouraged to travel and go to work by bike. Riding a bike 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. And the problem of air pollution would become less important than that of unemployment (失业).
Although cars have brought us a better life, they have also brought us new problems.
20. Which of the following is the most important transport in people’s daily life in America today?
| A．A bus | B．A car | C．A motorcycle | D．A bicycle |
21. Some large car factories in the USA are trying to build a new kind of car. The car ________.
| A．can clean itself | B．is used to clean streets |
| C．does not pollute the air | D．is easier to make |
22. What’s the most serious problem to American workers if the number of cars is cut down?
| A．They may have no work to do. | B．The environment will be worse. |
| C．The factories will be poorer. | D．Many people will have to go to work by bike. |
23. The writer wants to tell us ________.
| A．man won’t live without cars |
| B．cutting down the number of cars is the best way |
| C．riding a bike is the best way |
| D．cars can bring us a better life but they can also bring us serious problems |
24. According to the passage, which of the following is TRUE?
| A．It isn’t easy for Americans to change the way of life. |
| B．Americans haven’t realized the serious problem of air pollution caused by cars. |
| C．The best way to reduce the polluted air is to build a new kind of car. |
| D．Americans are encouraged to travel and go to work by car. |
