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.
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.
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.
【小题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 caused by dirty air【小题2】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 live【小题3】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 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.【小题4】The fumes from coal and oil may cause metal . A．to corrodeB．to twistC．to turn blackD．to bee rusty【小题5】In larger cities, the fumes from coal and oil may contribute to .A．heart diseaseB．loss of clear visionC．lung diseasesD．serious headacheB
网友回答
(答案→)B
解析：本文主要讲述了空气污染的原因和空气污染呢的影响，号召人们注意保护环境。
【小题1】B 主旨大意题。本文主要讲述了空气污染的原因和空气污染呢的影响，故B项正确。
【小题2】A 推理题。在文章的最后一段详细说明的空气污染的危害，正是为了说服人们不要污染空气了，要多做对环境保护有利的事情。故A项正确。
【小题3】D 细节题。根据第一段后5行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.说明城里的汽车多，燃烧的煤炭多正是城里比乡下污染严重的原因。故D项正确。
【小题4】A 细节题。根据最后一段2,3行fumes may kill trees and plants and cause metal to corrode.说明A项正确。
【小题5】C 细节题。根据文章最后两行In some of the larger cities, these fumes endanger the live of human beings by contributing to lung diseases and causing early death.
说明这样的污染能导致肺部疾病，导致人的死亡。故C项正确。