锟斤拷锟斤拷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 cars. Statistics show that 93 percent of all auto trips are within cities. 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.

锟斤拷锟斤拷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 to the air.

锟斤拷锟斤拷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 death.

锟斤拷锟斤拷1. The key point of the passage is that _________.

锟斤拷锟斤拷A. the cause of air pollution is people

锟斤拷锟斤拷B. the causes and the effects of air pollution are both found in cities

锟斤拷锟斤拷C. the effects of air pollution range from headaches to death

锟斤拷锟斤拷D. air pollution is caused by dirty air

锟斤拷锟斤拷2. What is the purpose of this passage?

锟斤拷锟斤拷A. to persuade people to stop polluting the air

锟斤拷锟斤拷B. to tell the causes of air pollution

锟斤拷锟斤拷C. to tell why cities are bad places to live

锟斤拷锟斤拷D. to describe why cities are bad places to live

锟斤拷锟斤拷3. Why is air pollution more grave in the city than in the country?

锟斤拷锟斤拷A. Because there larger populations in cities.

锟斤拷锟斤拷B. Because the air in the city is dirty.

锟斤拷锟斤拷C. Because there are more cars in the city.

锟斤拷锟斤拷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.

锟斤拷锟斤拷4. The fumes from coal and oil may cause metal ______.

锟斤拷锟斤拷A. to turn black B. to become rusty

锟斤拷锟斤拷C. to corrode D. to twist

锟斤拷锟斤拷5. In larger cities, the fumes from coal and oil may contribute to ___________.

锟斤拷锟斤拷A. heart disease B. lung diseases

锟斤拷锟斤拷C. loss of clear vision D. serious headache

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