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With the fast development of China, more and more citizens have bought cars. That means the number of cars running on the roads

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问题    With the fast development of China, more and more citizens have bought cars. That means the number of cars running on the roads of China is increasing. This also brings a serious problem:air pollution. You are asked to write a composition of more than 400 words to express your ideas about the relation between the car and air pollution.
   In the first part of your writing you should present your thesis statement, and in the second part you should support the thesis statement with appropriate details. In the last part you should bring what you have written to a natural Conclusion or a summary.
   Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in loss of marks.
   Write your composition on ANSWER SHEET FOUR.
选项
答案 Cars, One of the Main Causes of Air Pollution Too many cars have created a lot of serious problems in our world. Besides congestion, accidents and fast fuel consumption, cars are responsible for a good part of air pollution in big cities. All the time, they are pumping huge amounts of waste gases into the atmosphere. These gases are very harmful, causing disease and even death. Last winter, car fumes formed heavy smog Over Beijing, making the sky gloomy for weeks and deterio- rating people’s health. Moreover, they do not only damage our health but also damage the health of out planet. According to the U. S. Environmental Protection Agency (EPA), driving a car is the single most polluting thing that most of us do. Motor vehicles emit millions of tons of pollutants into the air each year. In many urban areas, motor vehicles are the single largest contributor to ground-level ozone, a major component of smog. Ground-level ozone is the most serious air pollution problem in the northeast and mid-Atlantic states. Cars also emit several pollutants classified as toxics, which cause as many as 1, 500 cases of cancer in the country each year. Auto emissions also contribute to the environmental problems of acid rain and global warning. One possible solution is to design and develop clean cars and clean fuels. Clean fuels include reformulated gasoline, oxygenated gasoline, and alternative fuels. The EPA estimates that reformulated gasoline reduces ozone-forming emissions and toxic air pollutants by 15 to 17 percent. Reformulated gasoline will be required in areas where ozone levels exceed the federal health standard. Electricity is also one of the future driving powers for cars. In Tsinghua University, campus buses are driven by electricity. In Beijing some of the public buses begin to run on natural gas, which does not give off as much carbon dioxide as the petrol. But it may take decades for the new models of clean cars to completely replace the traditional ones. Another solution is to develop modern public transportation systems and restrict the use of private cars. If the price of petrol rises constantly and the public vehicles are efficient and convenient enough, most people will not private cars. And the total number of cars in big cities will reduce greatly. On the whole, the elimination of air pollution needs the co-efforts from the government, the public and the environments. This problem will be solved only with the help of science and technology.
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