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  3. In 1980 a report was published about what the earth might be like 20 years from then. The report was the result of a three-year

In 1980 a report was published about what the earth might be like 20 years from then. The report was the result of a three-year

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问题 In 1980 a report was published about what the earth might be like 20 years from then. The report was the result of a three-year study.
   According to the report, the picture of the earth in the year 2,000 is not a(51)one. The world will be more crowded because the(52)will continue to grow. The population(53)be as large as 6,300 million, almost 2,500 million more than that in 1975.(54)people would move into cities, especially cities in(55)countries.  Cities like Cairo and Jakanta (56)would each have 15 million by ’then. Food production will increase, but not enough to feed all the people. Farmers will grow 90 % more food than they did in 1975, but most of the increase would be in countries that already produce enough food for their people.(57)increase is grown in South Asia, Africa and European  countries. Poor farming ways are(58)large areas of cropland, changing farms into deserts. More farmland is lost(59)cities become larger and houses are built. Air pollution will get worse as industrial countries (60)more coal and oil. Much of the world’s(61)could disappear as more and more trees are cut down. Energy will continue to be a(62)problem. The experts hope their picture of the earth for the year 2000may be wrong. Measures must be taken to change the situation that(63)today. By changing the situation, by setting the problems, the picture can be changed. There is(64)time for the nations of the world to work together on a plan of action. But they(65)that waiting too long to make decisions would greatly reduce the chances of success.
选项 A、because
B、if
C、as
D、when
答案C
解析 句意为“随着城市扩大房屋的建造，会失去更多的农田”。故选C项；D项when(当……的时候)不合句意。
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