Book6Unit4Globalwarming

1、Book 6 Unit 4 Global Warming Reading The earth is becoming warmer But does it matter? 教學(xué)目標(biāo)教學(xué)目標(biāo) 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. 教學(xué)方式教學(xué)方式: brainst

2、orm and group work 具體實施措施具體實施措施: 1) 介紹溫室與溫室效應(yīng)介紹溫室與溫室效應(yīng) 2) 分組，分任務(wù)進(jìn)行對課文的處理，包括篇章結(jié)分組，分任務(wù)進(jìn)行對課文的處理，包括篇章結(jié) 構(gòu)、觀點(diǎn)呈現(xiàn)、段落大意和詞句歸納等。構(gòu)、觀點(diǎn)呈現(xiàn)、段落大意和詞句歸納等。 3) 小組報告和總結(jié)指導(dǎo)。小組報告和總結(jié)指導(dǎo)。 4) 小組制作小組制作PPT，進(jìn)行成果展示。，進(jìn)行成果展示。 教學(xué)用具教學(xué)用具 a computer and a projector Book 6 Unit 4 Global Warming 1. What do you know about global warming? 2.

3、 How does global warming come about? 3. How is the relation between global warming and our life? Before reading Background knowledge about global warming What is a greenhouse and its function? What are greenhouse gases and their effect? Before reading Background knowledge about global warming What i

4、s the greenhouse made and used for? What is this? a greenhouse A greenhouse is made of glass 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 ma

5、kes the greenhouse heat up and so the plants can grow throughout the cold period. What are the “greenhouse gases”? In the atmosphere surrounding the earth there are gases called “greenhouse gases”, including carbon dioxide, methane (甲烷甲烷, 沼氣沼氣) and water vapor. What do you think greenhouse gases do?

6、 They trap the heat of the sun and keep the air surrounding the earth warm. Reading The Earth Is Becoming Warmer But Does It Matter? 1. What kind of article is it? 2. What factors (因素因素) will you consider before you begin reading this article? 3. What will you learn from this article? 4. How are you

7、 carrying out your reading? 5. What reading strategies are you going to use? 讀前思考讀前思考 1. Article structure 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 th

8、e writer show his opinion or intention? 2) What are the opinions in the article? 3. The study of words, expressions and sentences. 4. Main idea in each paragraph and summary. Group tasks 在介紹溫室與溫室效應(yīng)之后，安排好閱讀任 務(wù)，讓學(xué)生進(jìn)行小組閱讀活動。 以下的PPT均為學(xué)生的小組閱讀活動成果展 示，學(xué)生從自己的角度來對這篇科普性文章 進(jìn)行閱讀，老師只是進(jìn)行必要的指導(dǎo)。 1. Article structur

9、e and characteristics. 1. Article structure and characteristics. 2. The Writers opinion (opinions in the article) or the 2. The Writers opinion (opinions in the article) or the writers intention.writers intention. 3. Main idea in each paragraph and sum 3. Main idea in each paragraph and sum 4. The s

10、tudy of words, expressions and sentences.mary. 4. The study of words, expressions and sentences.mary. How is this article organized? The writer put forward a question.Then he shows us graph1, which is about temperature difference from long-term average. Next he shows us about the greenhouse gases th

11、at 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 temperature to increase. But the attitudes of scientist

12、s 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 shows two graphs and some opinions of the scientists to

13、 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. 1. Article structure and characteristics. 1. Article structure and characteristics. 2. The Writers opinion (opi

14、nions in the article) or the 2. The Writers opinion (opinions in the article) or the writers intention.writers intention. 3. Main idea in each paragraph and sum 3. Main idea in each paragraph and sum 4. The study of words, expressions and sentences.mary. 4. The study of words, expressions and senten

15、ces.mary. 1) What are the opinions in the article? 1. Article structure and characteristics. 1. Article structure and characteristics. 2. The Writers opinion (opinions in the article) or the 2. The Writers opinion (opinions in the article) or the writers intention.writers intention. 3. Main idea in

16、each paragraph and sum 3. Main idea in each paragraph and sum 4. The study of words, expressions and sentences.mary. 4. The study of words, expressions and sentences.mary. 3 3、Main idea in each paragraph and summary.Main idea in each paragraph and summary. Paragraph1: Give us a question about how gl

17、obal 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 gas and oil to produce energy. Paragr

18、aph4: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 towards this rise are completely d

19、ifferent. Paragraph7: The writer doesnt show his view about global warming but leaves us to think about it. 1. Article structure and characteristics. 1. Article structure and characteristics. 2. The Writers opinion (opinions in the article) or the 2. The Writers opinion (opinions in the article) or

20、the writers intention.writers intention. 3. Main idea in each paragraph and sum 3. Main idea in each paragraph and sum 4. The study of words, expressions and sentences.mary. 4. The study of words, expressions and sentences.mary. 4 4、The study of words, expressions and The study of words, expressions

21、 and sentences.sentences. Paragraph1- Paragraph1-3 1、Random(adj/n):at random 2、Come about:=take place=happen=break out,無被動 3、phnomenon:復(fù)phenomena 4、Subscribe to:訂閱、申請、同意贊成 n：subscriber Subscription 5、quantities of=a quantity of 前者做主語謂語動詞用復(fù)數(shù)，后者用單數(shù) 6、tend:tend to 7、That probably does not seem much to

22、you or me, but it is a rapid increase when compared to other natural changes. 這是一個由when 引導(dǎo)的 時間狀語從句，省略了it is 原句應(yīng)為That probably does not seem much to you or me, but it is a rapid increase when it is compared to other natural changes. 8、Without the greenhouse effect ,the earth would be about thirty-thr

23、ee degrees Celsius cooler than it is .這是一個含蓄虛擬語氣句。常用 的還有but for 意味要不是，原句的意思是如果沒 有這種溫室效應(yīng)，地球的溫度將比現(xiàn)在還要低33攝 氏度左右。 9、There is on doubt that the earth is becoming warmer and that it is human activity that has caused this global warming rather than a random but natural phenomenon （1）前兩個that引導(dǎo)的是同位語從句，因為 the

24、re is no doubt在結(jié)構(gòu)上雖完整但在語意上有 缺陷所以需要同位語從句將語意補(bǔ)充完整。 （2）第三個that是強(qiáng)調(diào)句，因為去掉it is和that 后 human activity has caused this global warming rather than a random but natural phenomenon 是個完整的句子。 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. 解析： it was.who 為強(qiáng)調(diào)句型 w