A: Hi, Wang Tian. Would you like to go shopping with me this Sunday?

B: Sorry, Li Xiang.

A: Yes. It's a problem.

B:

A: Oh, the population is growing faster and faster.

B: If the population keeps growing like this, there will be standing room only.

A:

B: Everyone in the world should care for the population problem.

A:

B: Can you give me an example?

A: Robert Wyman, a professor from Yale University. He is famous for" Open Yale course: Global Problems of Population Growth(耶鲁大学开放课程: 全球人口增长问题) ".

    It seems that the cities in the future will have to change. Because the world's population is (增长) , there will be more people in the cities tomorrow.

    It may be (不可能) for any family to live in a house with land around it. There won't be enough (空间) for them. A way to(解决) this (问题) may be the skyscraper city(摩天城). A famous skyscraper named Taipei 101 in China is about 508 metres high. The skyscraper cities in the future will be many times (高) .

    About 250, 000 people will live in a skyscraper city. Nearly a million people can live in four of these great buildings. Each skyscraper city will have four towns in it and each town will have ten (村庄). They will live, work and (度过) their free time in them. They won't need to leave the city (除非) they want to. They will be able to move about in the city by transport controlled(控制) by computers. Let's (想象) what the life will be like then!

    Today more and more people live in cities. So there is usually little room in a city to grow food.1of the land in a city is used 2 homes, shops, roads and parks. Most food for city people is grown in the country. It is often brought to the city by3, train and plane. Some food 4 comes into the city by car.

    Water is5 thing that cities get from the country. Everyone needs water every day. We use a little of it for6, but we use even more to 7bathtubs(浴缸) and wash streets.

    The water used in cities comes mostly from the rain. But people8use the rain that falls on cities. The rain becomes dirty as it falls through dirty air. Once it hits city buildings or streets, the rain will pick up more dirt. It is not good for drinking or bathing.

So cities must reach out to the 9 country for water. There the rain falls through air onto trees and grass. The fallen rain runs 10 rivers and lakes. So it is important to keep both cities and the country clean.

Beijing is a big city   .

We're   to talk about this problem.

Just now Ithat phone number．

Why not find a right place to that plan?

Harry is interested in many subjects， history and maths。

 you the news?