book 6 unit 4 global warming导学案

Book 6 unit 4 Global Warming
Period One Reading I
编写人：
Class: Group: Name: 组内评价：教师评价：
【使用说明及学法指导】
自学：20分钟自学课本26-27页课文，独立完成学案上的题目。

1.先快读课文一遍，完成【自学导引】。

2.在精读课文一遍，完成【课时探究】。

3.难以理解的句子要结合课后注释做好理解，仍未解决的要用问号标注出来，等待质疑
解决。

【学习目标】
1.准确理解课文，掌握课文中的基础知识，培养快速阅读、整体理解的能力。

2.通过学习课文明确全球变暖的危害，激发学习兴趣。

【自学导引】
Task 1 skimming to get the general ideas.
1.Read the text carefully and write down the main idea of the text.
The passage puts forward different points of view about the effect of increased in the atmosphere, the of the earth’s increased temperature and the possible effects.
2. Skim the text and match the main idea with each paragraph.
Para1A the cause of the earth’s becoming warmer
Para2B the consequence of burning fossil fuels
Para3C the increase of carbon dioxide
Para4D Global warming will go on
Para5E puzzles about global warming
Para6F different attitudes to global warming
Para7G an introduction to the passage
Task 2 Scanning to get detailed information and choose the best answer.
1. What is the purpose of the first paragraph?
A. To introduce the topic.
B. To compare the temperatures.
C To show the source of the text. D. T o tell us about a famous scientist.
2. George Hambley thinks 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.
3. Which of the following is to blame for the increase in carbon dioxide in the atmosphere?
A. Planting more trees.
B. Burning fossil fuels.
C. Cutting down forests.
D. Raising more animals.
【课内探究】
Read the text again and complete the following exercise.
1．That probably does not seem much to you or me，but it is a rapid increase when compared to other natural changes. （思考：1.句子成分分析；2. 划线部分的用法）
译：_________________________________________________________。

when compared to other natural changes是一个省略的时间状语从句，其完整的形式应该是_______________________________________________。

在时间、地点、条件、方式或让步状语从句中，如果从句和主句为同一主语，或者从句的主语是it,而且从句中的谓语动词时动词be或含有助动词be，可省略__________________。

翻译：（1）如果是这样的话，我们最后一定能够成功。

__________________________________________________________ （2）尽管他受到了批评，但他工作依然很努力。

__________________________________________________________
2．There is no 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. （思考：1.句子成分分析；2. 划线部分的用法）
①There is no doubt that…是一个常用句型，意为，但There is(some)doubt之后常接_______引导的从句，表示“怀疑是否会…”，“不确定…”。

仿写：不确定他是否能够胜任这个工作。

____________________________________.
②and that后引导的是从句。

此从句中it is …that…是。

3.All the scientists subscribe to the view that the increase in the earth’s temperature is due to t
he burning of fossil fuels like coal,natural gas and oil to produce energy.（思考：1.句子成分分析；2. 划线部分的用法）
译：___________________________________________________________。

view之后的that引导的是一个_______从句，解释说明view的内容。

be due to中的to是_____,后接名词或动名词，表示“…是由…引起的”，“…是因为”。

仿写：由于交通拥堵他迟到了。

______________________________________________。

4．Without the'greenhouse effect',the earth would be about thirty-three degrees Celsius cooler than it is.
本句通过介词短语Without the'greenhouse effect'，来表示与相反的虚拟语气，相当于if there were not the'greenhouse effect'.
翻译：如果没有音乐，这个世界将变成一个无趣的地方。

______________________________________________。

5. It is OK to leave an electrical appliance on so long as you are using it—if not，turn it off! （思考：1.句子成分分析； 2. 划线部分的用法）
本句中as/so long as为从属连词，引导从句；if not为。

仿写：①只要你喜欢，你就可以待在这里。

You may stay here ____________________.
①只要还活着，我就要学习。

____________________________________________。

【能力提升】
根据课文内容完成下面的短文
Many scientists like Dr.Janice Foster believe that people have caused the increase in the earth’s temperature 1.____________ burning fossil fuels like coal，natural gas and oil to produce energy whose byproducts2.____________(call)“greenhouse” gases，the most important one being carbon dioxide.These gases trap heat 3.____________ the sun and therefore warm theearth，without 4._________ the earth5._________(be) about thirty­three degrees Celsius cooler than it is.But an increased amount of carbon dioxide 6.____________(mean) that more heat energy tends to be trapped in the atmosphere7.___________(cause) the global temperature to go 8.____________. On 9.____________ other hand，scientists like George Hambley predict that any warming will be mild with few bad 10.____________(environment) consequences.In fact，more carbon dioxide is actually a positive thing.。