北師大版高中英語選修八unit22environmentalprotectionthesecondperiod教案(存儲版)
【正文】 of thatclause? S1: It is an attributive clause modifying ‘a(chǎn)n average increase’. T: Good! ‘that’ refers to ‘a(chǎn)n average increase in the Earth’s temperature’. From this sentence we can learn an average increase in the Earth’s temperature will cause climate changes. In the second sentence there is also an attributive clause caused by ‘ which’. What does ‘which’ refer to? S2: ‘Which’ refers to greenhouse gases. T: Right! Greenhouse gases trap heat from the sun in the Earth’s atmosphere. Without greenhouse gases, the earth would be very cold and impossible for life. Do you have any other questions? S2: No. T: There are many useful phrases in the text. Please sum up the phrases and then we will analyze the text. Step V Practice Deal with Ex 5 on page 7. Ask students to do the exercises individually. While doing the exercises, remind students that they should pay attention to the correct form of the given words. Make necessary changes where needed. Then check the answers with the whole class. Step VI Analyzing the text Help students analyze the structure of the text. Ask students to discuss in groups and later each group will speak out their opinions. After this, show the suggested answers on the PowerPoint. T: OK. Let’s read the text again. Please look a t the structure of the text. You are given 5 minutes. ? T: Please stop here. I’m glad you thought actively and had a heated discussion. What is its writing style? Ss: This text is an expository writing. T: What is the topic of the text? What is the text about? S1: Global warming. S2: The text introduces what global warming is. S3: Its causes and consequences. S4: And how we can help solve the problem of global warming. T: Quite good. How many parts consist of the article? What’s the main idea of each part? S4: In my opinion the article is made up of four parts. In the first paragraph the author raises the question. In the second paragraph we can find its definition. And the third and fourth paragraphs tell us its causes and consequences. And the last part the author gives us some tips on how to solve the problem. T: Well done! If students have different opinions, Teacher may help them analyze the text. Show the following on the PowerPoint. Part1 (the first paragraph) Global warming could be one of the biggest environmental problems facing the 21st century. Part2 () What global warming is. Part3 () Its causes and consequences. Part4 () Tips on how to solve the problem. T: After learning the tips on how to solve the problem, let’s discuss what we will do every day to help reduce greenhouse gases. Please make your voice heard and get involved in the discussion. After the discussion, please write your suggestions on a piece of paper and put it on your bulletin board so that you can share your ideas with the whole class. Step VII Discussion Divide the students into different groups and discuss the questions of Ex 4 on Page 7. They are given several minutes to discuss. Each me
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