1、Unit 4 Global warming请根据下列任务预习课文，并在课堂上按照老师的引导检查各项任务的完成情况。Task I. Skimming Read the text (P26 - P27) quickly and fill in the blanks.The text explains the 1. _ of the earths increasing temperature and puts forward different views about the 2. _ of increasing carbon dioxide in the atmosphere.Task II. C
2、areful readingI. Read the text (P26 - P27) carefully and fill in the blanks.Facts about global warming The temperature of the earth rose about 1. _ Fahrenheit during the 20th century. The global warming is caused by 2. _ instead of a random and natural phenomenon.Views on global warmingDr Janice Fos
3、ter Small amounts of gases in the atmosphere trap 3. _ from the sun and therefore warm the earth. We need those gases because without them the earth would be about thirty-three degrees Celsius 4. _ than it is. When large quantities of extra 5. _ were added into the atmosphere, the global temperature
4、 went up. Over the next 100 years the amount of warming could be as low as 1 to 1.5 degrees Celsius, but it could be as high as 5 degrees. An increase of five degrees in the temperature would be a(n) 6. _.George Hambley Any warming will be mild with few bad 7. _. More carbon dioxide is a(n) 8. _ thi
5、ng, which will make plants grow quicker, crops produce more and more animals survive all of which will make our life better.II. Choose the best answers.1. Who found out the amount of carbon dioxide in the atmosphere from 1957 to 1997?A. Sophie Armstrong. B. Charles Keeling.C. Dr Foster. D. George Ha
6、mbley.2. What is the purpose of the last paragraph?A. To make readers disappointed with the problem. B. To make readers think about the problem.C. To show the authors opinions on the problem. D. To begin some discussion about the future.答案TaskI.1. causes 2. effectsTask II.I.1. one degree 2. human activity 3. heat 4. cooler 5. carbon dioxide 6. catastrophe 7. environmental consequences 8. positiveII.1-2 BB3