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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 exhaust fumes (废气) 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 average, we throw away more trash and garbage than the year before. The burning of garbage leads to air pollution. Many major industries are also the cause of the dirty air in and around the cities. The fumes from iron, steel, chemical, and petroleum production add particles 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 or loss of clear sight. Wherever coal and oil are used for fuel, fumes may kill trees and plants. In some of the larger cities, these fumes endanger the lives of human beings by leading to lung disease and causing early death.
Which of the following bad effects that air pollution has on people is NOT mentioned in the passage?
选项 A、Heart disease.
B、Lung disease.
C、Loss of clear sight.
D、Headaches.
答案A
解析 根据最后一段中出现的cause headaches or loss of clear sight. Wherever coal and oil are used for fuel, fumes may kill trees and plants. In some of the larger cities, these fumes endanger the lives of human beings by leading to lung disease可知，B、C、D三项均是空气污染给人们带来的负面影响；文中并未提及A项(心脏病)。故选A。
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