Book6Unit4Globalwarming.ppt

1、Book 6 Unit 4 Global Warming,Reading The earth is becoming warmer But does it matter? 教学目标 1) Enable students to know how global warming comes about and whether it matters. 2) Get students to learn the specific words or expression to express their opinions about global warming. 教学方式: brainstorm and

2、group work,具体实施措施: 1) 介绍温室与温室效应 2) 分组，分任务进行对课文的处理，包括篇章结 构、观点呈现、段落大意和词句归纳等。 3) 小组报告和总结指导。 4) 小组制作PPT，进行成果展示。 教学用具 a computer and a projector,Book 6 Unit 4 Global Warming,1. What do you know about global warming? 2. How does global warming come about? 3. How is the relation between global warming and

3、our life?,Before readingBackground knowledge about global warming,What is a greenhouse and its function? What are greenhouse gases and their effect?,Before readingBackground knowledge about global warming,What is the greenhouse made and used for?,What is this?,a greenhouse,A greenhouse is made of gl

4、ass or plastic and is used for growing plants, especially during cold weather.,How does a greenhouse work? 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 the plants can grow throughout the cold period.,What ar

5、e the “greenhouse gases”? In the atmosphere surrounding the earth there are gases called “greenhouse gases”, including carbon dioxide, methane (甲烷, 沼气) and water vapor.,What do you think greenhouse gases do? They trap the heat of the sun and keep the air surrounding the earth warm.,Reading The Earth

6、 Is Becoming Warmer But Does It Matter? 1. What kind of article is it? 2. What factors (因素) will you consider before you begin reading this article? 3. What will you learn from this article? 4. How are you carrying out your reading? 5. What reading strategies are you going to use?,读前思考,1. Article st

7、ructure and characteristics. 1) How is this article organized? 2) What are the characteristics of this article? 2. The Writers opinion (opinions in the article) or the writers intention. 1) How does the writer show his opinion or intention? 2) What are the opinions in the article? 3. The study of wo

8、rds, expressions and sentences. 4. Main idea in each paragraph and summary.,Group tasks,在介绍温室与温室效应之后，安排好阅读任 务，让学生进行小组阅读活动。 以下的PPT均为学生的小组阅读活动成果展 示，学生从自己的角度来对这篇科普性文章 进行阅读，老师只是进行必要的指导。,Unit4 Global Warming,1. Article structure and characteristics. 2. The Writers opinion (opinions in the article) or the

9、 writers intention. 3. Main idea in each paragraph and sum 4. The study of words, expressions and sentences.mary.,1. Article structure and characteristics.,How is this article organized? The writer put forward a question.Then he shows us graph1, which is about temperature difference from long-term a

10、verage. Next he shows us about the greenhouse gases that cause this change and the importance of these gases.,Later, he shows us graph2, which is about carbon dioxide content in the atmosphere from 1957 to 1997. Graph2 was made by Charles Keeling. And all scientists accept this data. It will cause t

11、emperature to increase. But the attitudes of scientists towards this rise are completely different. However, the writer doesnt show his opinion about this.,What are the characteristics of this article?,The characteristic of the article is to raise a question for us to think about at first, then it s

12、hows two graphs and some opinions of the scientists to explain so that people can understand the information about the Global Warming more straight. Finally,the writer gives some questions to make readers think about the answer by themselves.,Unit4 Global Warming,1. Article structure and characteris

13、tics. 2. The Writers opinion (opinions in the article) or the writers intention. 3. Main idea in each paragraph and sum 4. The study of words, expressions and sentences.mary.,2、The Writers opinion (opinions in the article) or the writers intention.,From the article, we can learn two kinds of opinion

14、s about whether greenhouse effect is beneficial or not. However, it still remains a question, which nobody understands exactly, including the writer. Theres a view all the scientists agree on: The increase in the earths temperature is due to the burning of fossil fuels like coal, natural gas and oil

15、 to produce energy.,1) What are the opinions in the article?,2) How does the writer show his opinion or intention?,After knowing how the global warming comes about, we also want to explore whether it matters. But what will global warming cause? Dr. Janice Foster thinks we cant predict the climate we

16、ll enough to know what to expect, but it could be very serious.,On the contrary, in George Hambleys opinion, its a positive thing, with whose help, plants will grow quicker, crops will produce more, encourage a greater range of animals. Only time will tell, the effects of global warming, after all,

17、no one knows now.,Unit4 Global Warming,1. Article structure and characteristics. 2. The Writers opinion (opinions in the article) or the writers intention. 3. Main idea in each paragraph and sum 4. The study of words, expressions and sentences.mary.,3、Main idea in each paragraph and summary.,Paragra

18、ph1: Give us a question about how global warming come about and whether it matter. Paragraph2：The earth is becoming warmer because of human activity. Paragraph3：All scientists subscribe to the view that the increase in the earths temperature is due to the burning of fossil fuels like coal ，nature ga

19、s and oil to produce energy.,Paragraph4:The levels of carbon dioxide have increased greatly over the last 100 to 150 years Paragraph5:All scientists agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide. Paragraph6:The attitudes of scientists

20、 towards this rise are completely different. Paragraph7: The writer doesnt show his view about global warming but leaves us to think about it.,Unit4 Global Warming,1. Article structure and characteristics. 2. The Writers opinion (opinions in the article) or the writers intention. 3. Main idea in eac

21、h paragraph and sum 4. The study of words, expressions and sentences.mary.,4、The study of words, expressions and sentences.,Paragraph1- Paragraph1-3 1、Random(adj/n):at random 2、Come about:=take place=happen=break out,无被动 3、phnomenon:复phenomena 4、Subscribe to:订阅、申请、同意赞成 n：subscriber Subscription 5、qu

22、antities of=a quantity of 前者做主语谓语动词用复数，后者用单数 6、tend:tend to,7、That probably does not seem much to you or me, but it is a rapid increase when compared to other natural changes. 这是一个由when 引导的时间状语从句，省略了it is 原句应为That probably does not seem much to you or me, but it is a rapid increase when it is compar

23、ed to other natural changes. 8、Without the greenhouse effect ,the earth would be about thirty-three degrees Celsius cooler than it is .这是一个含蓄虚拟语气句。常用的还有but for 意味要不是，原句的意思是如果没有这种温室效应，地球的温度将比现在还要低33摄氏度左右。,9、There is on doubt that the earth is becoming warmer and that it is human activity that has cau

24、sed this global warming rather than a random but natural phenomenon （1）前两个that引导的是同位语从句，因为there is no doubt在结构上虽完整但在语意上有缺陷所以需要同位语从句将语意补充完整。 （2）第三个that是强调句，因为去掉it is和that后 human activity has caused this global warming rather than a random but natural phenomenon 是个完整的句子。,Paragraph4-5 9.It was a scientist called Charles Keeling,who made accurate measurements of the amount of carbon dioxide in the atmosphere from 1957 to 1997