新建unit4课件2.ppt
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1、黎城一中张燕慧Watch and discuss:1.What problem does it mention in this video?2.How has this come about?greenhouse effectGreenhouse3.What is the greenhouse made of and what is its purpose? A greenhouse is made of glass and is used for growing plants, especially during cold weather. The air inside is warm be
2、cause the glass traps the heat from the sun and keeps it from escaping.This makes the greenhouse heat up and so the plants can grow throughout the cold period. It performs the same function as the greenhouse gases. They trap the heat of the sun and keep the air surrounding the earth warm, this is ca
3、lled the greenhouse effect.Greenhouse4.What are Greenhouse gases?Water vaporCarbon dioxideMethanemi:ein In the atmosphere surrounding the earth there are gases called “greenhouse gases”, includingThe earth is becoming warmerBut does it matter? Glance quickly at the magazine article and answer the qu
4、estions.1.Who wrote the magazine article? What is the name of the magazine?2.What is the main topic of the article?3.What are the names of the three scientists mentioned in the article?4. What are the two graphs about?First Reading4. What are the two graphs about?Graph I shows the temperature increa
5、se of one degree Fahrenheit between 1860 to 2000.Graph 2 is about the carbon dioxide content in the atmosphere, 1958-1990.Second Reading1.Divide the whole passage into 4 parts1.Read the text carefully and sum up the main idea of each part.Part one:(para )Part two:(para ) Part three:(para )Part four:
6、(para )Introduce the problem of global warming .Explain how global warming comes about. List two different attitudes among scientists towards global warming. Its up to readers to think and decide whether people should do something about global warming or not.762-512.Read the passage again and answer
7、 the following questions:Dr. Foster thinks that ( ).George Hambley thinks that ( ).Second ReadingA. We need gases like carbon dioxide, methane and water vapour, but if we add huge quantities of extra carbon dioxide to the atmosphere by burning fossil fuels, it will cause the global temperature to go
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