Unit4Globalwarming课件1（新人教选修6）.ppt

Section Ⅰ　Warming up Reading —— Pre-reading;Step One：Warming up Ⅰ.We depend on energy to do many things in our daily lives. Make a list of things that use energy in your home，in your school，or any other places you can think of. ________________________________________________________________________________________________________________________________________________ 答案：　Fridge；television；computer；stove；washing machine；hairdryer；air-conditioner；light and so on.;Ⅱ.Look at the picture and then answer the following questions. 1．What are these buildings made of and what is their purpose? __________________________________________________ 答案：　They are made of glass and plants can grow in it when it is cold outside.;2．How does it work? __________________________________________________ 答案：　The glass traps heat from the sun and keep it from escaping.This makes the greenhouse heat up and so the plants can grow well during the cold period.;Step Two：Fast reading Scan the text and then choose the best answer according to the text. 1．Who studied the amount of carbon dioxide in the atmosphere between 1957 and 1977? A．Dr Janice Foster.　　　 B．Charles Keeling. C．George Hambley. D．Sophie Armstrong. 答案：　B;2．The author probably agrees that________. A．global warming is good for us B．we can do nothing about global warming C．catastrophes will happen if the globe keeps on warming D．much remains to be found out about the effects of global warming 答案：　D;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．Why does George Hambley state that more carbon dioxide is actually a positive thing? A．It will make plants grow faster. B．Crops will produce more. C．It will encourage a greater range of animals. D．All of the above. 答案：　D;5．What may happen if we do nothing about global warming? A．There may be a rise