【大气环境保护的意义】《大气环境保护》沉浸式双语教案设计──高一地理上册第二章第七节

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教学目标

1.了解大气污染所形成的全球变暖、臭氧层的破坏、酸雨等现象产生原因及危害；

2.正确认识大气环境保护的重要意义；

3.通过沉浸式双语讲授，学生在掌握地理知识的过程中，应用英语，提高英语应用能力。

教学重点

1.全球变暖

2.臭氧层的破坏和保护

3.酸雨的危害

教学难点

英语语境的建立与学科学习相结合

教学准备

多媒体课件

教学过程

1．introduction (导入新课)

show to the students the picture that the earth is sweating like a man feeling enormously hot in summer and the picture of antarctic hole of ozonosphere， and watch the short film about acid rain. (出示地球出汗的卡通片，南极臭氧空洞图片以及观看酸雨影片片段，指出全球大气环境已经受到严重的污染，所以本课要研究大气环境保护)

2．presentation （教授新课）

2.1. 整体思路

guide the students to know three atmospheric problems， each problem instructed in this way: first， what causes the problem; secondly， what harmful affects such problem bring; and finally， measures that can be taken to solve the problem.(分别讲述大气环境的三大问题，每个问题的以如下方法呈现：一产生问题的原因；二是其危害，三应当采取的措施)

2.2 具体教材双语的讲授。

2.2.1 global warming

after a picture that show the change of the temperature of the earth in recent year， i put forward a question: “is the temperature going up or down? the students answered and students understand what is “global warming”. then the students discussed the cause of global warming in english， i listened to them and help them express themselves in english， finally conclusions were reached about what the human should do to stop the earth from getting hotter < in this session， students listened to english speaking and they spoke english in discussion and even they tried to express their ideas in english.>

2.2.2 the protection of ozone layer

at first a short english film show how the cfc “eat” the o3， then with the more widely use of the refrigerator that used cfc， antarctic hole of ozonosphere appeared(comes the picture of antarctic hole of ozonosphere) after that， english film show harmful affects about the depletion of ozone layer. in the same way， what to do to protect ozone layer is the last thing for students to know.< english film is good environment for students to immerse themselves in english. )

2.2.3 acid rain

put forward question after question to fulfill the instruction of the content， such as a) what is acid rain; b)how it comes into being; c) where does acid rain frequently happen d)why acid rain is harmful e)what to do to reduce acid rain. ( in this session， i establish question for students to think about， then by picture and film i let the students analyze the problem themselves， and solve the problem themselves， in which they were trained to analyze facts to find the answer， at the same time， english thinking pattern is applied. )123

3．exercises （课堂练习）

我用英文设计了几个单项选择题和双项选择题复习巩固学生所学的教学内容，同时也通过作题，学生的英语阅读理解能力得到了锻炼。练习如下：

1．choose the right answer from a， b， c and d（there is only answer that is right）.

1) carbon dioxide is the main _______in the atmosphere.

　a.gas that can form acid rain
　　　b. greenhouse gas
　　　c. gas that will damage the ozonosphere
　　　d. gas that can form cloud to rain

2)deforestation will result in the increase of_______.

　a.carbon dioxide　　b. carbon oxide
　　　c.sulfur dioxide　　d. cfc

3)apart from the natural factors that damage the ozonosphere， the human being’s break-down of ozone mainly refers to _______.

　a.the release of carbon oxide　　b. the release of carbon dioxide
　　　c.the release of cfc　　　　　　 d. the release of nitrogen oxide

4)in the atmosphere， ozonosphere lies in the ______.

　a.troposphere　　b. stratosphere　　c. mesosphere　　d. hydrosphere

5)the acid rain in china is mainly sulfated acid rain because _____.

　a.we burn wood for main energy
　　　b.we burn coal for main energy
　　　c.we have power station propelled by fire
　　　d.our power station propelled by water

2.choose the two right answers from a， b， c and d.

1)the artificial reasons for the increase of carbon dioxide in the atmosphere are _____.

　a.burning of fossil fuels
　　　b.construction of power station
　　　c.deforestation
　　　d.the sea is polluted

2)the direct reasons for global warming to raise the sea level are ______.

　a.there will be more rivers
　　　b.more rainfall and less evaporation
　　　c.ocean water expand due to the increase of temperature
　　　d.melted polar ice makes the sea level rise

3)the damage of the ozonosphere result in _______.

　a.more people will have skin cancer
　　　b.rainstorms in the whole world
　　　c.global drought
　　　d.damage of the ecologic environment and agriculture

4)the gases that will form acid rain are _______.

　a.carbon dioxide　　b. sulfur dioxide
　　　c.nitrogen oxide　　d. carbon oxide

5)the affects that acid rain result in are _______.

　a.acidify the soil
　　　b.more people get skin cancer
　　　c.acidify water in the rivers and cause fish to die
　　　d. decay in buildings and culture relics

4.homework (课后练习)

answer the following questions according to the text:

part 1 global warming:

6)what are the main problems of atmospheric environment today?

______________________________________________________________________________

7)is the global warming only due to natural reasons?123

______________________________________________________________________________

8)what’s the artificial reason that makes the air temperature rise?

______________________________________________________________________________

9)in what ways can the human beings increase carbon dioxide in the atmosphere?

______________________________________________________________________________

______________________________________________________________________________

10)how does the sea level rise? (there are two ways， what are they?)

______________________________________________________________________________

11)what will be affected when the rainfall and humidity conditions around the world change?

______________________________________________________________________________

12)what are the measures to reduce the amount of released carbon dioxide?

______________________________________________________________________________

______________________________________________________________________________

part 2 the damage and protection of ozonosphere

13)what’s the artificial reason for the reduction of the amount of ozone in the stratosphere?

______________________________________________________________________________

14)if the amount of ultraviolet rays reaching the earth surface increases， what are the harmful affects?

__________________________________________________________________________________

15)what can we do to protect the ozonosphere?

______________________________________________________________________________

______________________________________________________________________________

part 3 the damage and prevention of acid rain

16) what is generally called acid rain?

______________________________________________________________________________

17) how does acid rain coming into being?

___________________________________________________________________________

18) why is acid rain in china sulfated?

______________________________________________________________________________

19) in what part of china do the areas have been changed into acid rain areas?

_____________________________________________________________________________

20) what are the harmful affects of acid rain?

_____________________________________________________________________________

_____________________________________________________________________________

21) how can we prevent and control acid rain?

____________________________________________________________________________

123

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