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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.
Which of the following is NOT mentioned in the passage?
选项 A、Heart diseases.
B、Lung diseases.
C、Loss of clear sight.
D、Serious headache.
答案A
解析 本文中，没有提及过污染导致心脏疾病。
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