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《Book 6 Unit 4 Global Warming 文本研读》学案

编写人：刘荣华          审核人：周松林         编写时间： 2013--11-04

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【学法指导】

 1、认真学习学习目标、学习重点，牢牢把握学习要求。

 2、熟读课本P26-27页的课文，学会根据文章标题和结构预测课文内容（尤其是难的文章），快速阅读掌握文章大意和细读处理相关练习的方法。

3、将预习中遇到的疑难点问题表示出来以备课堂上小组讨论、突破。

【学习目标】1. To learn about the causes and effects of global warming.        

 2. To strengthen the awareness of environmental protection.

【学习重点】  To get the main idea and detailed information of the passage.

【学习难点】  To learn about the causes and effects of global warming and different opinions about it.  

【知识链接】

● Because of global warming, the weather tends to be more and more abnormal. This phenomenon has caused many catastrophes to us, such as snowstorms, droughts, famines and floods. Last year, a heavy flood struck our district. Quantities of our possessions were washed away, including our grains, animals and even people. It causes serious consequences. Now people have realized how global warming has come about and what it will result in. However, humans are still consuming the natural resources in a random way.  

【学习步骤】                                                                  

Step1 Warming up

What effects does the global warming have on our daily life?

Step2 Fast reading

Skim the passage and deal with the following tasks.

1. The passage can be divided into 4 parts. Match the main idea with each part.

Part 1 ( 1 )                    A. Different attitudes towards the rise of carbon dioxide.

Part 2 ( 2 – 5 )                 B. Global warming will continue for decades or centuries.

Part 3 ( 6 )                    C. Illustrate (阐明) how global warming comes about.

Part 4 ( 7 )                    D. Raise a question to introduce the topic.

Step3 Careful reading

1. Read the passage carefully and deal with the following tasks.

1. Choose the best answers.

1). Janice Foster explains that________.

A. global warming is a random but natural phenomenon.       

B. more carbon dioxide will make our life better.

C. too much extra carbon dioxide going into the atmosphere causes global warming.

D. the consequences of global warming will never be very serious.

2). Who figured out the amount of carbon dioxide in the atmosphere from 1957 to 1977? ________.

A. Dr. Janice Foster                         B. Charles Keeling  

C. George Hambley                         D. Sophie Armstrong

3). Which of the following is False according to the article? __________.

A. Greenhouse gases are the byproducts of the process of burning fossil fuels.

B. The carbon dioxide content in the air increased by 55 parts per million from 1957 to 1997.

C. All scientists accept the data in graph 2 except Dr Janice Foster.

D. Janice Foster agrees that greenhouse gases are, in some way, good to the earth.

4). George Hambley states that more carbon dioxide __________.

 A. may lead to catastrophe.

 B. will do good rather than harm to the earth.

 C. will cause the spread of diseases.

 D. will encourage a great range of animals, thus threatening human beings.

5). From the article, we can infer that ________.

A. The earth has become warmer since the early 20^th century.

B. The increasing carbon dioxide is the only reason for global warming.

C. Some scientists think the sea level will rise as a result of global warming.

D. The issue of global warming will continue to be discussed.

2. Complete the summary according to the article.

   Many scientists s___________ ___________the view that the i___________ of the earth’s temperature is _________ _________ people’s burning of fossil f________. Gases in the atmosphere may t________ heat from the sun and w________ the earth. But quantities of e________ carbon dioxide lead to the global temperature _________ _________. Some people predict that serious global warming will be a c____________. They believe there may be the r_________ of the sea level, severe natural disasters, the s_________ of diseases and the d__________ of species. On the other hand, others state that more carbon dioxide is actually a p_________ thing, which will make our life b_________. Anyway, the climate is going to _________ _________ warming for decades or centuries. No one is sure of the c____________ of global warming.

3. Listen to the tape, paying attention to the intonation and pronunciation.

Step 4 Post reading

1.Discussion: As a student, what should we do about global warming?

2.Writing practice.

全球气候变暖是目前人类面临的最大环境问题。请你根据以下提示，写一篇英语短文,为“节能减排”献计献策。

背景:随着经济的发展，更多的温室气体被排放，其中大约70%为二氧化碳，这也是全球变暖的主要原因之一。后果： 海平面上升；自然灾害频繁。措施:1.多使用清洁能源，少用煤、油；2.在可能的情况下以步代车;3.……;4.……

注意：1. 短文必须包括上述所有内容要点，可适当发挥，措施中3、4点可自由发挥；

      2. 词数:120左右。

With _________________________________________(随着经济的发展), more and more greenhouse gases ___________________________________________________(被排放到空气中). CO2 _______________________(占据)about 70% of the greenhouse gases, _____________________________________________________________________(这被认为是全球变暖的主要原因之一). It has harmful effects, _______________________________(导致海平面上升) and many natural disasters to strike.

So we must____________________________________(采取有效的措施)to save our planet. First, we should ____________________________________ (多使用清洁能源，少用煤、油). Second, we should go to work on foot or by bus _____________________________________(而不是开车) if possible. Third, we should plant more trees, because ______________________________________(植物能将二氧化碳转化为氧气).  _______________________(更为重要的是), we should ____________________________________(养成节约能源的习惯) in our daily life.

With the development of economy，more and more greenhouse gases are being discharged into the air. CO2 makes up about 70% of the greenhouse gases，which is considered to be one of the greatest causes of global warming. It has harmful effects，causing the sea level to rise and many natural disasters to strike.

So we must take effective measures to save our planet. First，we should use more clean energy and less coal and oil. Second，we should go to work on foot or by bus instead of driving a car if possible. Third， we should plant more trees， because plants can turn CO2 into oxygen. More importantly， we should form the habit of saving energy in our daily life.

组长点评

1.注重对学生的学法指导。

2.是很好的阅读教学的导学案模板。

3.问题的设置层层递进。

4.体现了冥思式结尾。