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  3. People and the sources of air pollution are found in the same places. This means that cities with large populations have the big

People and the sources of air pollution are found in the same places. This means that cities with large populations have the big

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问题     People and the sources of air pollution are found 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 source of air pollution is the gas fumes(烟尘)from cars. Another major source 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 trash and garbage than the year before. The burning of garbage contributes to air pollution. Many major industries are also responsible for the dirty air in the around cities. The fumes from iron, steel, chemical, and petroleum production add particles(粉尘)to the air.
    The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy for 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. In some of the larger cities, these fumes endanger the live of human beings by contributing to lung diseases and causing early deaths.
What are the major sources of air polluting in cities?
选项 A、Trash and garbage.
B、Major industries.
C、Cars and population.
D、Gas fumes and the burning for energy.
答案C
解析 根据文章第一段第一句话“people and the sources of air pollution are found in thesame places．”第四句话“a major source of air pollution is the gas fumes from cars．”可知。
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