摘要：(五)录音中有一篇短文和五个问题.听短文和问题两遍后.从小题A.B.C三个选项中.选出能回答每个问题的正确答案. London used to be "foggy", but it's mostly caused by the serious air pollution instead of the weather there. In London, some of this pollution came from factories, but a lot of it came from the coal that people burnt to keep warm. By the 1950s, the problem became so bad that the government didn't allow people to burn coal in cities. A few years later, the air became much cleaner. Today, many Chinese cities have the same problem with air pollution. However, this problem is more difficult for Chinese cities to solve. One reason is that most of the pollution comes from factories rather than from burning coal. If the government closed these factories, a lot of workers would lose their jobs. Another reason is that changing from"dirty" fuels to cleaner ones is quite expensive. However the air in many cities is still becoming cleaner, as the government and people pay more and more attention to protecting the environment. Questions: 21. How was the air in London in the 1950s? 22. Why did the air become cleaner in London a few years later? 23. What problem do many Chinese cities have according to this large? 24. In China, what's the main cause of the problem? 25. Why is the air becoming cleaner in China? (注意:请同学们翻到第二卷第五大题.做听力填表题.)

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