Air pollutionPeople and air pollution are often in the same places. This means that citieswith large populations have the biggest problem of dirty air. Air pollution iscaused by many different things. A major kind of air pollution is the gas fromcars. Statistics(统计资料) show that 93 percent of all auto trips are withincities.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 isused in the city than in the county.On the average, we throw away more rubbish than the year beforE.The burningof rubbish makes air pollution even worsE.Many major industries are alsoresponsible 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 levelsof pollution found in heavy traffic may cause headaches for loss of clearvision. Wherever coal and oil are used for fuel, fumes may kill trees and plantsand cause metal to corrode(腐蚀). In some of the larger cities, these fumesendanger the lives of human beings by contributing to lung diseases and causingearly death.26. The key point of the passage is that().A.the cause of air pollution is peopleB.the causes and the effects of air pollution are both found in citiesC.the effects of air pollution range from headaches to death27. What is the purpose of this passage?A.to persuade people to stop polluting the air().B.to tell the causes of air pollutionC.to tell why cities are bad places to live28. 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 andoil for energy in the city than in the country.29. The fumes from coal and oil may cause metal().A.to corrodeB.to twistC.to turn black30. In larger cities, the fumes from coal and oil may contribute to().A.heart diseaseB.loss of clear visionC.lung diseases
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