Unit4Globalwarming第一学时课件（人教版选修6）.ppt

Unit 4　Global warming　　　　　　　 　　　　　 第一学时　Reading and Comprehension;?Task 1;答案： In the passage，Sophie Armstrong explores the questions on how human activity creates “greenhouse gases”which directly leads to the global warming，and shows us the different attitudes among scientists towards global warming.;?Task 2;C．catastrophes will happen if the globe keeps on warming D．a lot remains to be found out about the effects of global warming 2．All the followings are true EXCEPT________ . A．everyone believes that global warming is caused by human activities B．carbon dioxide is a byproduct of burning fossil fuels;C．people accept Charles Keelings data because he took accurate measurements D．not all the scientists agree with each other on the effect of the global warming 3．The main difference between Dr.Janice Fosters theory and George Hambleys lies in________. A．how to prevent global warming B．what causes global warming ;C．whether global warming would cause serious problems or not D．whether the levels of carbon dioxide have increase or not over the years 4．“But there are some very different attitudes among scientists towards this issue.” “issue” here means the same as the one in “________”． A．I bought the new stamp the day of its issue;B．This is a big issue；we need more time to think about it C．She is always on a diet—she has issues about food D．The magazine has 12 issues each year 5．What may happen if we do nothing about global warming? A．There may be a rise of the sea level.;B．The temperature will surely be lower. C．The “greenhouse effect” will disappear. D．It has nothing to do with us.;?Task 3;When we 4.______ huge quantities of extra carbon dioxide into the atmosphere，the global temperature goes 5.______;?Task 4;2.________ the burning of fossil fuels like coal，natural gas and oil to produce energy 3.________ byproducts are called “greenhouse” gases，the most important one 4.________ carbon dioxide.These gases trap heat from the sun and therefore warm the earth，without whi