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1、Unit4 Behind beliefs课外阅读阅读文章，选择正确答案，回答问题。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 from
2、cars. Statistics show that 93 percent of all auto trips are within cities. Another major source of dirty are 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 mo
3、re 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 to the air.The effects of air pollution rang
4、e 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 life of human b
5、eings by contributing to lung diseases and causing early death.1. 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 deathD. air pollution is caus
6、ed by dirty air2. What is the purpose of this passage?A. To persuade people to stop polluting the airB. To tell the causes of air pollutionC. To tell why cities are bad places to liveD. To describe why cities are bad places to live3. Why is air pollution more grave in the city than in the country?A.
7、 Because there are larger populations in cities.B. Because the air in the city is dirty.C. Because there are more cars in the city.D. 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. to turn blackB. to become rustyC. to corrodeD. to twist5. In larger cities, the fumes from coal and oil may contribute to _.A. heart diseaseB. lung diseaseC. loss of clear visionD. serious headache答案：1. B2. A3. D4. C5. B
