【正文】 But birth control programs are beginning to have an impact. Demographers predict that by the middle of the new century the global count will level off at something under ten billion. The UN population agency has presented today’s achievement as a success for humanity, pointing out that people are living longer and healthier lives than any generation in the history.B b c aThe boy will be sharing a birthday with a few hundred thousand people and in the next year, another eighty million will be joining him on the planet.The earth’s population has doubled since 1960 and with more than a billion young people just entering their productive years.Demographers predict that by the middle of the new century, the global count will level off at something under ten billion.Part III A water/ 70% red or brown/ plant cover snow/ continents islands arms of the ocean connecting a channel valleys plainsB 12 million / 2/ 10 million/ 10/ 3/ 6/ 4/16 million/ 18 million1. Mexico City 2. Sao Paulo 3. Rio de Janeiro 4. Bombay5. Delhi 6. Shanghia 7. SeoulIInterview EExpertI: In Britain we are often told that people are leaving the big cities to live in the countryside but is this the case worldwide?E: Not at all. If you look at the biggest cities in 1950, seven out of the top ten were in the developed countries but by the year 2000, the developing countries will have eight out of the top ten. New York, which in 1950 was number one with a population of around 12 million, will only be the sixth largest city in the world but with an extra 2 million.I: And London?E: London, which was number two, won’t even be in the top ten. Its population in 1950, by the way, was about 10 million.I: And why is this happening? Why are people moving to the big cities from the country in the developing countries?E: The reasons are plex but many are moving to look for work. And the problems this creates are enormous. It’s estimated that 26 million people will be living in Mexico City by the year 2000, with Sao Paulo in Brazil not far behind.I: It’s difficult to believe.E: I know. Rio de Janeiro will have a population of a mere 13 million. Well, just imagine the kinds of difficulties this is going to cause in terms of health, transport and education.I: Yes. What about the cities of Asia? Will they be experiencing a similar sort of growth?E: In some cases, yes. Calcutta in India which was No. 10 in the league in 1950 is expected to be the fourth biggest city in the world with a population of 16 million quadrupling its size in just 50 years. Bombay and Delhi too are expected to be in the top ten.I: What about Japan?E: Ah! Well, Tokyo was number three in 1950 and that’s where it’ll be at the beginning of the next century, although its population will have trebled to about 18 million. Looking at the other major cities in Asia, Shanghai and Seoul will be in the top ten as well but, perhaps surprisingly, not Beijing or Hong Kong.I: Now, if we could turn our attention to home, what about the trend of people moving out of the cities…Part IV skills /the main idea/what/recognize/central / important/direction/ purpose/inform/pare/answer/stated/a topic sentence/ first/ details/ difficult/ persuade/ end/ implied/ hinted at/a wholeUnit 3 Traveling from Place to Place Part Ⅰ A BA912/11:20/17 BA877/11:20/14 BA292/11:25/19 TW695/11:30/16 4 EA831/11:35/24BA838/9 IB290/11:35/15 LH039/11:40/9 BA666/11:40/18 AI141/6 BA560/22 Last call for British airways flight BA912 for Tokyo. BA912 for Tokyo due to depart at 11:20 boarding at gate 17.British airways flight BA877 to Boston. British airways flight BA877 to Boston duo to depart at 11:20 boarding now at gate 14. British airways flight BA292 for Frankfurt, Athens and Karachi. Flight BA292 for Frankfurt, Athens and Karachi duo to depart at 11:25 now board at gate 19.TWA flight, TW695to New York. TWA flight TW695 to New York departing at 11:30 boarding at gate 16.B Tea, soft drinks, coffee, Egg and tomato, ham and tomato, egg and chips, roast chicken, cheeseburgersTape script:Chief Steward: may I have your attention please, ladies and gentlemen? This is the chief steward speaking. We would like to inform all passengers that the buffet car is now open. The buffet car is situated towards the middle of the train. On sale are tea, coffee and soft drinks, a selection of fresh and toasted sandwiches including egg and tomato, ham and tomato, egg and cress, roast chicken and toasted cheese。 cheeseburgers, beef burgers and sausages and a licensed bar. The buffet car is situated towards the middle of the train. Thank you.Part Ⅱ9:15/10:30 10:30/13:30 Quick/beautiful view /frequent service (hourly)/modern/fortable/lovely view from dining car Have to get Gatwick airport/ expensive quite crowded/quite expensiveAAnnabel CCharles DDouglasD: Ah! That’s much better!C: Ah! That’s yours, I think…er…Doug.D: Thank you very much, Charles.C: Right. You have a good journey then, Douglas? D: Yes I did, I did. I must say the plane was marvelous, marvelous.C: Very quick, then? D: Er…the plane journey was terrifically quick…er…I mean, you…er…what…you met me about 9…er…what…er…10…10:45.C: About 10:30.D: Yes, the plane got in at…er…10:30 and we left at 9:15.C: What time didi you have to start though in the morning? D: Well, that…er…that wa a different story, because I had to get to Victoria…um…at…you know, to get to Gatwick and it’s…er…from…er…Victoria to Gatwick three quarters of an hour. Then I had to leave home at 7:30 and get up at 6:30.C: Oh, gracious me!D: So I’m not sure if you save much really.C: Jet travel, my goodness me! It was worth the experience, though?D: Oh, I mean, you know, I’ve never flown across the south of England and it really looked absolutely fantastic, especially as we appro