21. If the urban population of the developing countries exceeds 2 billion people by the year 2000, the main problem the additional people will face is______.

　　A. housing B. food

　　C. poverty D. limited land

　　22. According to the passage, about US $116 billion is required to give minimum comfort to these people by the turn of the century less than US $ 10 billion per year. Do you think which year was the article written by saying less than $ 10 billion per year by the turn of the century?

　　A. 1985. B. 1990.

　　C. 1988. D. 2000.

　　23. The mankind should face the phenomenon that the world has become a world of cities with______.

　　A. a lot of difficulties

　　B. efforts to improve housing condition

　　C. pressure of the basic needs

　　D. new models and a great deal of transformation of ideas and methods

　　24. In Africa, people in cities will be______by the end of the century.

　　A. almost twice as much as in 1985 B. doubled than that in 1985

　　C. over twice as much as in 1985 D. 300 million

　　25. In spite of the efforts to improve housing condition, the number of people living in shanty-towns will increase because______.

　　A. houses in shanty-towns are cheap

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