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Have you ever heard someone say he is going outside "to get a breath of fresh air"?

Have you ever tried to imagine what life would be like if the air was so dirty that people couldn't get a breath of fresh air?

Everyone wants to know why the air has become so bad. Well,millions of cars and factories often give out waste gas. A lot of garbage is burned every day. . . Sometimes you can smell the pollution and sometimes,when the air looks smoky,you can even see it. But more often,pollution is invisible.

Whether you can see it or not,air pollution can cause a lot of damage. Not only people,but also plants,animals or buildings would suffer from it. Sometimes polluted air flies into the sky,then falls to the earth with snow,rain or dust again,and they turn the water acidic (酸的) .And indoor air pollution comes from cigarette smoke,carpet (地氈) cleaners and other ordinary household products.

Scientists have been fighting against air pollution for many years. They ask factories control the waste gas,and they have found some new ways to make the air clean. Cars have been equipped (裝備) with something to give out little gas. . . As for indoor pollution,people can just open doors and windows for a while to let the fresh air in.

Thanks to different kinds of controls,the air in the United States is better than it used to be. For example,between 1975 and 1984,the amount of carbon monoxide (—氧化碳) and sulfur dioxide (二氧孑匕^ 1) in the air dropped an average of more than 30 percent. The amount of lead dropped 70 percent. Today you can go outside to "get a breath of fresh air" in more and more places in the U. S.

(   ) 6. Why do people think that they can't get a breath of fresh air?

   A. Millions of cars and factories give out waste gas.

   B. Trash is burned every day,and cigarette smoke,carpet cleaners and other household products make the air smell bad.

   C. People can't control the air pollution effectively.

   D. All the above.

(   ) 7. What does the underlined word "invisible" mean?

   A. Unseen. B. Not able to be smelt.

   C. Not able to be heard. D. Not able to be tasted.

(   ) 8. Which is true about the acid rain?

   A. The polluted air flies into the sky,then falls to the earth with snow,rain or dust,and they can form acid rain.

   B. Acid rain is only dangerous to people or animals.

   C. Acid rain also does harm to the buildings.

   D. Both A and   C.

(   ) 9. How much did the amount of lead in the air drop from 1975 to 1984?

   A. 30% .   B. 50% .

   C. 70% .   D. The passage doesn't tell us.

(   ) 10. We can infer that         .

   A. if you live far away from factories and traffic,you'll be safe from air pollution

   B. you can always see and smell the air pollution

   C. we can open the doors and windows more to lighten indoor air pollution

   D. the waste gas from cars and factories is the only reason for air pollution

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"Most traffic accidents should not happen. They happen because people are careless. A frequent cause of traffic accidents is speed. Some people drive too quickly. This means that when they have to stop suddenly,they cannot stop quickly enough to avoid hitting other vehicles or people. You need to remember this when you are crossing the street or walking along the sidewalks. It's not only drivers who cause accidents,however. People on foot― pedestrians―and bicycle riders,often cause accidents,too. Pedestrians sometimes walk out into the street without looking. You should always look in both directions before stepping into the street. Do any of you ride a bike? Bicycle riders can cause accidents by changing directions suddenly without warning other road users. Before you turn left,for example,you should look backwards to make sure there aren't any cars,trucks or buses coming. You should signal with your left hand to show that you want to turn left. You should not turn until the street is clear. The rules of the road are very simple. If we learn them and obey them,we whould not have accidents any more."

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   A. walk along the sidewalks

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