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Cycling is a good exercise.（）, it doesn't pollute the air.
A . Therefore
B . Moreover
C . But
D . However
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英译中：Air pollution
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Cleaner heating system will in Beijing to control air pollution.
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Increased air pollution __________ respiratory illness.
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Pollution in the air reduced the _________ near the airport.
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I hope all the precautions against air pollution, ______ suggested by the local government, will be seriously considered here.
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Because air pollution has been greatly reduced, this city is still _______ .
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Air and water pollution not only affects everyone’s health but also makes it difficult for business to ________.
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听力原文：W: Air pollution is one of the most serious problems in the world. Polluted air can make us sick or even kill us. Why isn't more done to stop it？
M: Everyone wants to stop it, but it is a difficult problem to solve. Meat pollution is mused by things people need.
W: What do you mean？
M: Well, automobiles and airplanes cause pollution but they also provide transportation.
W: Right. And factories cause air pollution but they provide people with jobs and products.
M: Cities are the worst offenders. In crowded cities, factories and cars can add tons of pollution to the air every day.
W: Yes. When I drove, to town yesterday, the clear air changed. It seemed like a dark cloud hung over the city.
M: Nobody likes air pollution. It smells bad; it makes it difficult to breathe.
W: True, it even damages the plants that provide tis with food. No wonder we get sick. It's dangerous to everyone's health.
M: I think everyone knows it is a serious problem. When air pollution can even damage strong materials like steel and concrete; think what it does to poor humans.
W: It is terrible, and yet we do need some things that cause it. We'll have to try to figure out a solution.
(20)
A．Most people don't think it is a serious problem.
B．Most of our pollution is caused by things people need.
C．The government has not spent enough money to stop it.
D．The seriousness of pollution has not been realized by the government.
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The air pollution index went up t0 300 within a few days．
A．Right
B．Wrong
C．Not mentioned
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The____ only allows for adjustment of temperature in each room by the occupant manually controlling the air volume admitted.
A.central air condition system
B.high velocity system
C.low velocity system
D.single duct system
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Recent studies have shown that air inside many homes, office buildings, and schools is full of pollutants such as ().
A、chemicals
B、smoke
C、bacteria
D、perfume
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Recent studies have shown that air into a house often has higher concentrations of contaminants than heavily polluted air outside.
此题为多项选择题。
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______ at in this way, the air pollution in this region doesnt seem so serious.
A．Having looked
B．Looked
C．Looking
D．To look
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听力原文：W: Mr. Chairman, I think something ought to be clone about our city environment at once. You know, chimney pollution to land, air and water has mused serious health problems.
M: Could you elaborate on that, Mr. Hopkins？
Q: Where does this conversation probably take place？
(14)
A．In a conference room.
B．In a factory.
C．On board a ship.
D．In a hospital.
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As pointed out at the beginning of the passage, people used to think that air pollution ______ .
A．cause widespread damage in the countryside
B．affected the entire eastern half of the United States
C．had damaged effect on health
D．existed merely in urban and industries areas
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In what way can natural pollutants play an important role in controlling air pollution？
A.They function as part of a purification process.
B.They are dwarfed by the pollutants produced by human activities.
C.They are less harmful to living beings than are other pollutants.
D.They have existed since the Earth developed.
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听力原文： The World Bank says air pollution is one of the worst environmental problems in large cities around the world. Air pollution causes breathing problems. It also threatens crop production in farm areas near huge cities.
The United Nations Environment Program says that air pollution reduces the amount of crops produced, h also reduces the nutrient level of crops. As a result, both the buyer and the seller of crops are hurt by air pollution.
The UN says dirty air is a major source of metal in crops. These metals include lead, zinc and copper. These metals can build up to dangerously high levels in the parts of plants that people eat. The German Appropriate Technology Exchange, GATE, reports that eating these metals can cause developmental problems and low intelligence levels among children. Some kinds of cancers and kidney damage have also been linked to metals in crops.
Who is hurt by air pollution？
A．The buyer.
B．The seller.
C．Both the buyer and the seller.
D．None.
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Nowadays scientists are working hard to find out ______ to do with air pollution. A．how B．why C．when D．what
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People also react very differently to exposure to indoor air pollutants. Further research is 9 to
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Man-made air pollution mainly comes from mobile sources.（)
是
否
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The most important ways to reduce air pollution are to drive less, use less electricit
是
否
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Educators in schools and universities teach students about the effects of air pollution.
此题为判断题(对，错)。
