Scientists say that something very serious is happening to the earth. It will begin to get  1  in the 1990s. There will be major changes in  2  during the next century. Coastal waters will have a  3  temperature. This will have a  4  effect on agriculture. In northern areas, the  5  season will be ten days  6  by the year 2000. However, in  7  areas, it will be too dry. The  8  of water could decrease by eighty percent. This would  9  a large decrease in  10  production.

 World temperature could  11  two degrees centigrade by the year 2040. However, the increase could be three times  12  great in the Arctic and Antarctic areas. This could cause the  13  sheets to melt and raise the  14  of the oceans  15  one to two metres. Many coastal cities would be  16  water.

 Why is this happening? There arc too  17  carbon dioxide (二氧化碳)in the air. 18  oil, gas and coal burn, they create large  19   of carbon dioxide. This carbon dioxide lets  20  enter the Earth's atmosphere and  21  the Earth. However, it doesn't let as much heat  22  the atmosphere and enter space. It's  23  a blanket. The heat  24  the sun can pass through the blanket to warm the Earth. The heat  25  there and can't escape through the blanket again.

Scientists call this the green house effect.

 1. A. warmer B. colder C. better D. worse

 2. A. land  B. live C. climate D. weather

 3. A. lower B. higher    C. normal    D. proper

 4. A. good  B. general    C. serious    D. useful

 5. A. hot B. cold     C. autumn    D. growing

 6. A. longer B. shorter  C. busier    D. more important

 7. A. colder B. warmer    C. higher    D. lower

 8. A. much  B. many    C. amount    D. number

 9. A. lead B. keep     C. make     D. cause

 10. A. oil B. industrial   C. agricultural  D. coal

 11. A. increase B. drop     C. lift       D. be

 12. A. more B. as      C. much     D. less

 13. A. water   B. rain      C. solid      D. ice

 14. A. degree B. level     C. coast     D. area

 15. A. by B. to      C. of       D. with

 16. A. above B. under    C. in       D. over

 17. A. little B. many     C. few      D. much

 18. A. If B. Because   C. When     D. Why

 19. A. amount  B. amounts   C. deal     D. quantity

 20. A. sunlight  B. air      C. carbon dioxide  D. gas

 21. A. cold  B. protect  C. hurt      D. heat

 22. A. enter B. get   C. leave     D. reach

 23. A. like B. as   C. just      D. for

 24. A. through B. by  C. from     D. on

 25. A. get  B. arrive  C. reach     D. stay

答案: 1-5ACBCD  6-10ABCDC  11-15ABDBA   16-20BDCBA   21-25' DCACD

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