1、Unit 4 Global warmingReading The earth is becoming warmer - But does it matter?教案Teaching goals 教学目标1. Target language 目标语言a. 重点词汇和短语compare, phenomenon, graph, fuel, trap, data, climate, catastrophe, consequence, range, per, glance, compare to, come about, fierce debate, result in, build upb. 重点句式T
2、here is no doubt that the earth is becoming warmer. P26Without the慻reenhouse effect? the earth would be about thirty-three degrees Celsius cooler than it is. P2626They also agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide. P262. Ability
3、goals 能力目标Enable the students to talk about the causes and effects of global warming.3. Learning ability goals 学能目标Help the students learn how to talk about the causes and effects of global warming and express ideas about what people should do about it.Teaching important points教学重点Help the students
4、learn how to debate over the topic “We should do nothing about global warming.”Teaching difficult points 教学难点Enable the students to learn the writing skills of the text and get a better understanding of articles of this kind.Teaching methods 教学方法Listening, reading and group work.Teaching aids 教具准备 A
5、 recorder and a computer.Teaching procedures & ways 教学过程与方式Step RevisionCheck the homework.Review the useful expressions about agreement and disagreement.Show the students some pictures on the screen. The students have to give names of different energy sources relative to the pictures and deicide wh
6、ich energy sources are renewable and which are not. Then ask the students to tell the effects of using these energy sources.Step Pre-reading来源:学科网ZXXKShow a picture of greenhouse on the screen.T: Now look at the picture. What is it in the picture?S: A greenhouse.来源:学。科。网T: Right .Who can tell me wha
7、t it is used for?Sa: A greenhouse is made of glass and is used for growing plants, especially during cold weather.T: Yes, you are right. And how does it work?Sb: The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so
8、the plants can grow throughout the cold period.T: Exactly. Thank you. But today we are not going to talk about greenhouse, well talk about greenhouse gases. Have you heard about this before?Sc: I know. In the atmosphere surrounding the earth there are gases, which are called “greenhouse gases”, incl
9、uding carbon dioxide, methane and water vapor.T: Thats correct. Then what do you think greenhouse gases do?Sd: Let me explain it. They trap heat from the sun and therefore warm the earth.T: Yes. Last class we talked about the effects of burning fossil fuels. One of the effects is more and more carbo
10、n dioxide is being produced, which in turn increases the speed of global warming. Does it matter? Whatre your opinions? Next well read an article “THE EARTH IS BECOMING WARMER BUT DOES IT MATTER?”Step While-readingGet the students to read the passage fast and meanwhile help the students form a good
11、habit of reading.T: What do you think will be talked about at the sight of the title “THE EARTH IS BECOMING WARMER BUT DOES IT MATTER?” Now please skim the passage to obtain a general idea of the whole passage. While reading, pay attention to the writing skills and if possible, divide the whole pass
12、age into several parts and summarize the main idea for each part.After a few minutes.T: How many parts can this text be divided into?T: Any different ideas? OK. Now lets finish the form on the screen.Show the form on the screen and let the students complete the form.Main ideas of each partWriting te
13、chniquesStep ComprehendingLet the students read the passage again to find out the answers to the questions in Exercises 1 and 2.T: Now lets listen to the tape. While listening, pay more attention to specific information. Then read the whole passage by yourselves. Try to find out the answers to quest
14、ions in Exercises 1 and 2. You may work in groups.Step Debate Get the students to debate over the statement: We should do nothing about global warming. Let them work in groups of six to prepare it. 来源:Zxxk.ComT: Now you are going to have a debate: We should do nothing about global warming. Please fo
15、llow these instructions.Put the following instructions on the screen. Get into groups of six. Decide which three in your group are going to agree with the statement (Group A) and which three are going to disagree with the statement (Group B). Group A discuss why they agree with the statement; Group
16、B discuss why they disagree. Group A and B get together. Tell each other the reasons why agree or disagree with the statement.T: We dont have time to do it in class. Please finish it after class. Try to collect as much information as possible on the Internet and share it with the others in class. Next class Ill get some groups to act out your debates. Step Homework1. Read the passage again and review the new words and expressions.2. Prepare the debate in groups.3. Preview Using Language WHAT CAN WE DO ABOUT GLOBAL WARMING？
