To prevent the air ______, something will have to be done

        A to pollute    B to be polluted     C from polluting    D from being polluted

To prevent the air ___ ,something will have to ___.

        A.to pollute…take            B.from being polluted ..be done

C.to be polluted…be taken     D. from polluted… be done

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

Most Amorists find it hard to think what life would be without a car. However, some have realized the serious problem of air pollution by cars. The polluted air is poisonous and dangerous to health.

One way to get rid of the polluted air is to design a new car that Does not pollute. That’s what several large car factories are trying to do. But to build the new car is easier said than done. Progress in this field has been slow.

Another way is to take place of the car engine by something else. Engineers are now working on some new 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 the number of their cars they are encouraged to travel and go to work by bike. Biding a bike is though to help keep the air clean.

But this change does not come cagily, a large number of workers may find themselves with no jobs if a ear factory closes down. And the problem of air pollution would become less important than that of unemployment.

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

      A．One.                   B．Two.                   C．Three.                 D．Four.

2．Large ear feretories are trying to build a clean car,        .

       A．which is clean itself                             B．which is used to clean streets

       C．which does not pollute the air                D．which is easier to make

3．If the number of ears is cut down, the most serious problem in 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

4．What is the conclusion of the writer?

      A．Bicycling is the only way out.

       B．The number of ears must be cut down.

       C．Cars bring us nothing but serious problems.

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

阅读理解

　　Recently studies have shown that the earth is getting warmer. The scientists who carried out the studies say a large amount of CO₂ in the atmosphere is the reason for the warming. CO₂ is the gas which human and animals give off when They breathe. It is also produced when coal, oil and other things are burnt. Scientists have warned that this kind of burning is adding too much CO₂ to the atmosphere. They believe the gas acts like a green house--the grass-topped building used to grow plants in cold weather. They say the gas is like the grass roof of a green house, which lets in sunlight, but prevents heat from running away. As a result, they say the earth becomes warmer.

　　One of these scientists, Dr. Hansen, says the weather will become so hot that some rivers will dry up. On the other hand, satellite pictures show us there is less ice in the Antarctic during the summer time than in earlier years. The heat would turn all the ice at both ends of the earth into water, making the oceans rise five to seven meters higher than they are now.

(1)The weather is getting warmer because ________.

[　　]

A. there are too many human and animals on the earth

B. a lot of heat has been produced by burning of some materials

C. the sun has given more heat in recent years

D. there is a large amount of CO₂ in the atmosphere

(2)Farmers in cold weather build some green houses to ________.

[　　]

A. keep warm in winter

B. get some more sunlight

C. get some heat to plant some vegetables

D. prevent some vegetables from shining

(3)Too much CO₂ makes the earth warmer than before because ________.

[　　]

A. it can give heat to the earth

B. it can prevent heat from running away

C. it can absorb heat form the sun

D. it cam pollute the atmosphere

(4)According to the view of Dr. Hansen, some day in the future ________.

[　　]

A. all rivers on the earth will dry up

B. the water level on land will rise five to seven meters higher

C. all ice in the Antarctic will turn into water

D. all ice on the earth will turn into water

(5)What do you think the best way to prevent the earth from getting warmer?

[　　]

A. Many animals should be get rid of.

B. Many kinds of materials should be used again.

C. The growing increase of population should be controlled.

D. Something should be done to prevent air pollution.