新课标人教版选修六教案 Unit 4 Global warming.doc

Unit 4　Global warming Period 1　Warming Up，Pre－reading， Reading and Comprehending ．To learn about some facts and views about global warming. ．To learn how the information is organized. Step 1　Warming up 1．Warming up by reading and talking： Read through the exercise with the class.Put students in groups of four to talk about what we use energy for，what are the sources of these energy and whether the sources are renewable or non－renewable. Suggested answer：The six photos are：windmills；a coal power station；an oil refinery；a nuclear power plant；solar panels；a hydro－electric dam. 2．Warming up by discussion： Draw a form on the blackboard as follows： Things that use energy Sources of energy Renewable/non－renewable 　Let the students have a discussion and collect suggestions from students and write them under the appropriate heading. Ask the students how it works. Suggested answer：The glass traps the heat from the sun，making the air warm so that plants grow better. 2．Ask students what they think “greenhouse gases” are and what they think greenhouse gases do.Look at the picture above and explain it to their partners. Suggested answer：Greenhouse gases perform the same function as the glass in a glasshouse：they trap the heat of the sun and keep the air surrounding the earth warm.This is called the greenhouse effect.) Step 3　Reading and comprehending 1．Fast reading Ask students to read the passage quickly so as to get the key words and general idea of each paragraph and answer the following questions： (1)What is the main topic of the article? (2)Who wrote the magazine article？What is the name of the magazine? (3)What are the names of the three scientists mentioned in the article？Do they agree with one another? Suggested answers：(1)Global warming/the warming of the earth.(2)Sophie Armstrong，Earth Care. (3)Dr Janice Foster，Charles Keeling，George Hambley.They dont agree with each other. 2．Detailed reading (1)Read the passage carefully and judge whether the statements are true(T)