Beijing was the third polluted city in the world at the end of last century, according to the UN. But thanks to recent measures, the capital has made some progress. Last year 224 clear days were rated as having good air quality. In 1998 the air quality index(指数)gave just 100 days as good.

　　“I am glad to see an improvement, ”said a senior 1 boy living in the northwest of Beijing. “Compared to other places, the air quality of Beijing is still worrying though. I hate pollution. Once I was riding my bike in the morning when I almost had a traffic accident because I couldn’t see a car only metres away from me in fog. ”

　　In early October, the skies were covered by such a thick fog that a display show by the visiting French Air Force was called off.

　　Rapid development, industry, traffic fumes and sandstorms from the desert all contribute to the city’s bad air.

　　29. The passage is mainly about　.

　　A. a programme aiming at improving Beijing’s air quality

　　B. progress made in Beijing’s air quality

　　C. Beijing’s air pollution

　　D. the differences between Yinchuan and Beijing

　　30. Which of the following is NOT the measure taken or to be taken to improve Beijing’s air quality?

　　A. Clean fuel technology will be used in public transports.

　　B. Some factories have been asked to cut production.

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