外国公司的股票在美国上市通常采用（)形式。

Which is not the major environment issues of America？()

A、Air pollution

B、Water shortage

C、Loss of agricultural land

D、desertification

听力原文：W: I think air pollution is rather serious in this city.

M: You are right. Cars are still the major source of the pollution.

Q: What is the serious problem with the city？

(4)

A．Traffic accidents.

B．Economic crisis.

C．Air pollution.

D．Housing, shortage.

听力原文：W: I think air pollution is rather serious in this city.

M: You are right. Cars are still the major source of the pollution.

Q: What is the serious problem with the city？

(4)

A．Traffic accidents.

B．Economic crisis.

C．Air pollution.

D．Housing, shortage.

What is the passage mainly about？

A．How to fight air pollution in big cities.

B．How to avoid air pollution in big cities.

C．How to breathe fresh air in big cities.

D．How serious air pollution is in big cities.

Air pollution

People and air pollution are often in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different things. A major kind of air pollution is the gas from cars. Statistics(统计资料) show that 93 percent of all auto trips are within cities.

Another major kind of dirty air is the burning of coal and oil for energy. This energy is needed to make electricity. Of course, much more electricity is used in the city than in the county.

On the average, we throw away more rubbish than the year before. The burning of rubbish makes air pollution even worse. Many major industries are also responsible for the dirty air in the around cities. The fumes(烟)from iron, steel, chemical, and petrol production add particles(微粒)to the air.

The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode(腐蚀). In some of the larger cities, these fumes endanger the lives of human beings by contributing to lung diseases and causing early death.

26. The key point of the passage is that().

A. the cause of air pollution is people

B. the causes and the effects of air pollution are both found in cities

C. the effects of air pollution range from headaches to death

27. What is the purpose of this passage？

A. to persuade people to stop polluting the air().

B. to tell the causes of air pollution

C. to tell why cities are bad places to live

28. Why is air pollution more grave in the city than in the country？().

A. Because there are larger populations in cities.

B. Because the air in the city is dirty.

C. Because there are much more gas fumes from cars and burning of coal and oil for energy in the city than in the country.

29. The fumes from coal and oil may cause metal().

A. to corrode

B. to twist

C. to turn black

30. In larger cities, the fumes from coal and oil may contribute to().

A. heart disease

B. loss of clear vision

C. lung diseases

阅读理解：阅读下面的短文，根据文章内容从A、B、C三个选项中选出一个最佳选项。

Air pollution

People and air pollution are often in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different things. A major kind of air pollution is the gas from cars. Statistics (统计资料) show that 93 percent of all auto trips are within cities.

Another major kind of dirty air is the burning of coal and oil for energy. This energy is needed to make electricity. Of course, much more electricity is used in the city than in the country.

On the average, we throw away more rubbish than the year before. The burning of rubbish makes air pollution even worse. Many major industries are also responsible for the dirty air in the around cities. The fumes (烟) from iron, steel, chemical, and petrol production add particles (微粒) to the air.

The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode (腐蚀). In some of the larger cities, these fumes endanger the lives of human beings by contributing to lung diseases and causing early death.

1. The key point of the passage is that {A、B、C}.

A.the cause of air pollution is people

B.the causes and the effects of air pollution are both found in cities

C.the effects of air pollution range from headaches to death

2. What is the purpose of this passage？ {A、B、C}

A.to persuade people to stop polluting the air

B.to tell the causes of air pollution

C.to tell why cities are bad places to live

3. Why is air pollution more grave in the city than in the country？ {A、B、C}

A.Because there are larger populations in cities.

B.Because the air in the city is dirty.

C.Because there are much more gas fumes from cars and burning of coal and oil for energy in the city than in the country.

4. The fumes from coal and oil may cause metal {A、B、C}.

A.to corrode B.to twist C.to turn black

5. In larger cities, the fumes from coal and oil may contribute to {A、B、C}.

A.heart disease B.loss of clear vision C.lung diseases

Air Pollution

When people think about air pollution, they usually think about smog, acid rain, CFC's, and other forms of outdoor air pollution. But did you know that air pollution also can exist inside homes and other buildings？ It can, and every year, the health of many people is affected by chemical substances present in the air within buildings.

A great deal of research on pollution is being conducted at laboratories and universities. The goals of the research are to find solutions and to educate the public about the problem. Two places where this type of work is being done are LBNL and the University of California, Berkeley. Let's take a closer look at the various types of air pollution, the effects that they have on people, and what is being (or not being) done to correct the problem.

What is Air Pollution？

Air is the ocean we breathe. Air supplies us with oxygen which is essential for our bodies to live. Air supplies us with oxygen which is essential for our bodies to live. Air is 99.9% nitrogen (氮气), oxygen, water vapor and inert(惰性的) gases. Human activities can release substances into the air, some of which can cause problems for humans, plants, and animals.

There are several main types of pollution and well-known effects of pollution which are commonly discussed. These include smog, acid rain, the greenhouse effect, and "holes" in the ozone layer. Each of these problems has serious implications for our health and well-being as well as for the whole environment.

One type of air pollution is the release of particles (微粒) into the air from burning fuel for energy. Diesel smoke (柴油烟) is a good example of this particulate matter. The particles are very small pieces of matter measuring about 2.5 microns or about .0001 inches. This type of pollution is sometimes referred to as "black carbon" pollution. The exhaust from burning fuels in automobiles, homes, and industries is a major source of pollution in the air. Some authorities believe that even the burning of wood and charcoal (木炭) in fireplaces and barbeques can release significant quantities of soot (油烟) into the air.

Another type of pollution is the release of noxious gases, such as sulfur dioxide, carbon monoxide, nitrogen oxides, and chemical vapors. These can take part in further chemical reactions once they are in the atmosphere, forming smog and acid rain.

Pollution also needs to be considered inside our homes, offices, and schools. Some of these pollutants can be created by indoor activities such as smoking and cooking. In the United States, we spend about 80-90% of our time inside buildings, and so our exposure to harmful indoor pollutants can be serious. It is therefore important to consider both indoor and outdoor air pollution.

Outdoor Air Pollution

Smog is a type of large-scale outdoor pollution. It is caused by chemical reactions between pollutants derived from different sources, primarily automobile exhaust and industrial emissions. Cities are often centers of these types of activities, and many suffer from the effects of smog, especially during the warm months of the year. Additional information about smog and its effects are available from the Air Quality Management District (AQMD) in southern California.

For each city, the exact causes of pollution may be different. Depending on the geographical location, temperature, wind and weather factors, pollution is dispersed differently. However, sometimes this does not happen and the pollution can build up to dangerous levels. A temperature inversion occurs when air close to the earth is cooler than the air above it. Under these conditions the pollution cannot rise and be dispersed. Cities surrounded by mountains also experience trapping of pollution. Inversion can happen in any season. Winter inversions are likely to cause particulate and carbon mon

A．Y

B．N

C．NG

What makes the indoor air pollution？

A．Unsafe water.

B．Wood, animal waste.

C．Burning wood, coal or animal waste for fuel.

D．People's behavior.

The purpose of the passage is to ______.

A．describe the harmful air pollution

B．explain the way to prevent air pollution

C．show the worries about the air pollution

D．recommend a method to avoid air pollution