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人教版选修六Unit4《Global warming》word教案3


英语:Unit4《Global warming》教案(3) (新人教版选 修 6) Pre-reading, Reading, Comprehending Teaching Goals: 1.To read about global warming. 2.To get some idea about the effect of global warming. 3.To develop some basic reading skills. Teaching Procedures: Step 1. Warming Up Purpose: To arouse Ss interest in learning about global warming. 1. Team work Answer the questions below: (1) Have you ever seen a greenhouse? (2) How does a greenhouse work? (3) What do you think greenhouse gases do? 2. Group work Look at the picture, and ask Ss some questions. T: What is this building made of? S1: It’s made of plastic. T: What’s its purpose? S2: Plants can grow in it when it’s cold outside. T: How does it work? S3: The glass traps the heat from the sun, making the air warm so that plants grow better. Step 2. Pre-reading Purpose: To get Ss to learn about greenhouse gases. 1. Group work Now look at the word “GREENHOUSE GASES”. What does it mean? Greenhouse gases (GHG) are gaseous components of the atmosphere that contribute to the greenhouse effect .The major natural greenhouse gases are water vapor, which causes about 36-70% of the greenhouse effect on Earth (not including clouds): carbon dioxide, which causes between 9-26%; and ozone, which causes between 3-7%(note that it is not really possible to assert that such-and-such a gas causes a certain percentage of the GHE, because the influences of the various gases are not additive .The higher ends of the ranges quoted are for the gas alone ;the lower

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