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   21－25DCACD
 

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