Unit4Globalwarming课件（人教版选修6）.ppt

;1．Which of the following can cause global warming?;答案：略; 2．Have you ever heard about some news about global warming? 答案：略;Scan the text and then choose the best answer according to the text. 1．What is mainly discussed in the text? A．Carbon dioxide.　　　　 B．Water vapor. C．Gases in the atmosphere. D．Temperature increase. 答案：D; 2．George Hambley thinks that more carbon dioxide______. A．may lead to catastrophe B．will do good rather than harm to the earth C．will cause the spread of diseases D．will encourage a great range of animals，thus threatening human beings 答案：B; 3．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 author’s opinion on the problem. D．To begin some discussion about the future. 答案：B; 4．What will happen if we do nothing about global warming? A．It would cause the sea level to rise，storms，droughts，famines and so on. B．The temperature will be surely lower. C．It doesn’t matter. D．It has nothing to do with us. 答案：A;1．Skim the text and sum up the main idea of each paragraph. Para.1　A．the cause of the earth’s becoming warmer Para.2 B．the consequence of burning fossil fuels Para.3　C．the increase of carbon dioxide Para.4 D．global warming will go on Para.5　E．puzzles about global warming; Para.6　F．different attitudes to global warming Para.7　G．an introduction to the passage 答案：Para.1.G；Para.2.A；Para.3.B；Para.4.C； Para.5.D；Para.6.F；Para.7.E;2．Read the text and decide whether the statements are true (T) or false (F)． (1)Janice Foster believes that global warming is caused by burning fossil fuels.(　　) (2)Natural gas is a greenhouse gas.(　　) (3)Carbon dioxide is a byproduct of burning fossil fuels.(　　) (4)People accept Charles Keeling’s data because he took accurate measurements.(　　) 答案：(1)～(4)　F　T　T　F; 3．Read the text carefully and write down the main idea of the text. The passage puts forward different points of view about the effect of increased ①________in the atmospher