上外版（2020）选择性必修第三册 Unit 4 Protecting the Environment Reading 课件(共20张PPT)

(共20张PPT)
Unit 4
Protecting the Environment
Reading A
1.通过略读、跳读等阅读策略，了解二氧化碳的大致信息；
2.分析全文和部分段落，理解因果链语篇模式；
3.反思人类和温室效应的关系，并发表自己的观点。
学习目标 Learning Objectives：
Q1: What is the possible relationship between the two polar bears
Q2: What might have separated them from each other
They might have been separated from by the melting ice.
Pre-reading
Parent and kid (Mother and kid).
Pre-reading
Q1: What can you see in the picture Can you describe the picture briefly
Q2: Can you predict who is the ‘villain’ in the atmosphere
Q3:What do you expect to read in the passage from the title
The sea level is rising and it is
splashing
against the
windows along the
Carbon dioxide.
The harmful effects of carbon dioxide and the causes of these consequences.
fall noisily onto a surface
splashing
villain
a person or thing that is morally bad or responsible for causing trouble or harm
skyscrapers.
While-reading
1 The villain in the atmosphere is carbon dioxide.
...
4 But here is what this apparently harmless and certainly essential gas is doing to us:
...
7 And all because of carbon dioxide. But how does that come about What is the connection
Q1: There are some short paragraphs (e.g.Para 1, 4 and 7) in the text. What functions do they serve
Skim the passage and find out the functions of Para.1, 4 and 7 and the organization of the passage.
While-reading
Para.7 tells the reader that the next part is about the causes of these consequences.
Para.1 is the thesis of the text.
Para.4 tells the reader that what follows is the harmful effect of carbon dioxide.
Making the structure of the text clear and easy to follow.
Q2: What is the organization of the passage
carbon dioxide
Para 1
the effects
Para 4
the causes
Para 7
2022-4-11
Read Para. 2-3 and learn the function of small quantity of carbon dioxide, and then complete the mind map.
2
3
Q1: Is the small quantity of carbon dioxide a villain
tissue
Q2: What functions does it serve
（人、动植物细胞的）组织
While-reading
It does not seem to be a villain.
The small quantity of carbon dioxide in the air is essential to life. Plants absorb it and convert it into a necessity for all animal life.
carbon dioxide
Para 1
the effects
Para 4
the causes
Para 7
the functions
Para 2-3
no harm
a necessity for animal life
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Read Para.4-6, answer the teacher’s questions based on the text and complete the mind map.
4
5
6
Because the sea level is rising very slowly from year to year.
Q2: What’s the result after many cities are drowned according to the passage
apparently
according to the way sth. appears
While-reading
Much of the most productive farming land of the world will be lost and starvation will be widespread.
Q1: Why will Manhattan streets eventually be deep under water
according to the author
carbon dioxide Para 1
the effects
Para 4-6
the causes
Para 7 -11
the functions
Para 2-3
doing no harm
a necessity for animal life
the rising sea levels
the flooding of low-lying areas
farming land lost
2022-4-11
Read Para. 8 and complete the sentences corresponding to the diagram with one word for each blank.
红外线的；使用红外线的
infrared
radiation
辐射；放射线
Earth’s
sunlight
atmosphere surface
infrared radiation
radiation
less
heat
While-reading
2022-4-11
come about
9 We can be thankful that carbon dioxide is keeping us comfortably
concentration
of carbon dioxide in the
warm , but the atmosphere...it
made up
only 0.0316 percent of the atmosphere...
It is estimated that by 2020 the concentration will be about 0.0660 percent.
retreat,
10 This means that in the coming decades...the glaciers will and the polar ice caps will begin to melt.
11 It is the melting of the ice caps that is the worst change and it is this that demonstrates the villainy of carbon dioxide...If these ice caps begin to melt, the sea level will rise, with the result that I have already described.
Read Para.7-11, and tick what has been mentioned and then complete the chain of cause and effect.
retreat
to move away or back
7 And all because of carbon dioxide. But how does that
happen, occur
What is the connection
8 It begins with sunlight...This is called the “greenhouse effect” of carbon dioxide. 浓度，含量
What does "make up" mean according to the underlined sentence
to form as a whole
While-reading
10 This means that in the coming decades, the earth's average temperature will go up slightly. Winters will grow a bit milder on the average and summers a bit hotter. Little by
glaciers
ice
will begin to melt.
Read Para.7-11 ,and tick what has been mentioned and then complete the chain of cause and effect.
little, the will retreat, and the
ice caps
glaciers
ice caps
冰川
冰盖
While-reading
Read Para.7-11, and tick what has been mentioned and then complete the chain of cause and effect.
2022-4-11
a
f
e
h
√
√
√
√
While-reading
carbon dioxide Para 1
the effects
Para 4-6
the causes
Para 7-11
the functions
Para 2-3
doing no harm
a necessity for animal life
the rising sea levels
the flooding of low-lying areas
farming land lost
greenhouse effect
increased tempereture
the melting of ice caps
Checklist
Do you begin with a topic sentence that states the writer’s opinion clearly
Do you cover the writer’s main points
Do you use your own words
Do you use proper transitional words
Do you stick to original opinions
Do you limit the summary to 100 words
Post-reading
Summarise the passage according to the mind map of the text.
Post-reading
Work in pairs and discuss the aim of the passage and the writer’s attitude to the villain in the atmosphere.
By referring to harmful effects on people’s daily life, the writer shows his deep concern about the condition of atmosphere
The aim of the passage is to make the public of the serious consequences
of global warming. Yes.
2.What is the writer’s purpose in writing this passage To entertain/warn/complain/inform…
Has the writer achieved his/her purpose
1.What is the writer’s attitude to the villain in the atmosphere Is he indifferent/ concerned/ delighted/ frightened
Read aloud the passage three times.
Pay attention to your intonation, pronunciation and stress.
Build up a word bank related to the functions, the harmful effects and the causes of these consequences about CO2.
Homework
Thank you