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. warmerB. colderC. betterD. worse
2. A. land B. liveC. climateD. weather
3. A. lowerB. higher C. normal D. proper
4. A. good B. general C. serious D. useful
5. A. hotB. cold C. autumn D. growing
6. A. longerB. shorter C. busier D. more important
7. A. colderB. warmer C. higher D. lower
8. A. much B. many C. amount D. number
9. A. leadB. keep C. make D. cause
10. A. oilB. industrial C. agricultural D. coal
11. A. increaseB. drop C. lift D. be
12. A. moreB. as C. much D. less
13. A. water B. rain C. solid D. ice
14. A. degreeB. level C. coast D. area
15. A. byB. to C. of D. with
16. A. aboveB. under C. in D. over
17. A. littleB. many C. few D. much
18. A. IfB. 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. enterB. get C. leave D. reach
23. A. likeB. as C. just D. for
24. A. throughB. 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