人教版高中英语必修三Unit4 Astronomy the science of the stars warming-up&reading课件(46张PPT)

(共46张PPT)
高中英语（人教版）必修三 Unit 4 Astronomy: the science of the stars
Period 2
Warming Up & Reading

1. To understand the passage about how life began on the earth;
2. To be able to give a brief introduction of the topic of the text;
3. To arouse students’ awareness to protect the Earth.
If you were one of the characters in the movie, would you choose to save the earth? Why?
How much do you know about the earth?

The earth is our home.

The Solar System
null
海王星
Neptune
水星
Mercury
金星
Venus
地球
Earth
火星
Mars
木星
Jupiter
土星
Saturn
天王星
Uranus








1.plants
2.insects （昆虫）
3.fish
4.reptiles（爬行类）
5.shellfish（贝类）
6.amphibians（两栖类）
7.mammals（哺乳类）
Can you list some groups of life on the earth?
1.plants
2.insects （昆虫）
3.fish
4.reptiles（爬行类）
5.shellfish（贝类）
6.amphibians（两栖类）
7.mammals（哺乳类）
1.plants
2.insects （昆虫）
3.fish
4.reptiles（爬行类）
5.shellfish（贝类）
6.amphibians（两栖类）
7.mammals（哺乳类）
1.plants
2.insects （昆虫）
3.fish
4.reptiles（爬行类）
5.shellfish（贝类）
6.amphibians（两栖类）
7.mammals（哺乳类）
Human beings
1.plants
2.insects （昆虫）
3.fish
4.reptiles（爬行类）
5.shellfish（贝类）
6.amphibians（两栖类）
7.mammals（哺乳类）
How did life began
on the Earth?
Chinese Legends (传说)
Pangu
Nuwa
God created the world in seven days.
Religious Beliefs
Unit 4 Reading
How Life Began
on the Earth
Read the title and the two pictures and predict what the reading is about.
volcanic eruption
(火山喷发)
The Evolution of Life on the Earth
How life began on the Earth
Go through the passage quickly and tell
which paragraghs are about the earth and which about life on the earth.
HOW LIFE BEGAN ON THE EARTH
No one knows exactly how the earth began, as it happened so long ago. However, according to a widely accepted theory, the universe began with a "Big Bang" that threw matter in all directions.After that, atoms began to form and combine to create stars and other bodies. For several billion years after the "Big Bang", the earth was still just a cloud of dust. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. The earth became so violent that it was not clear whether the shape would last or not. It exploded loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour and other gases, which were to make the earth's atmosphere. What is even more important is that as the earth cooled down, water began to appear on its surface.
Water had also appeared on other planets like Mars but, unlike the earth, it had disappeared later. It was not immediately obvious that water was to be fundamental to the development of life. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas. This produced a chain reaction, which made it possible for life to develop.
Many millions of years later, the first extremely small plants began to appear on the surface of the water. They multiplied and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish. Next, green plants began to grow on land. They were followed in time by land animals. Some were insects. Others, called amphibians, were able to live on land as well as in the water. Later when the plants grew into forests, reptiles appeared for the first time. They produced young generally by laying eggs. After that, some huge animals, called dinosaurs, developed. They laid eggs too and existed on the earth for more than 140 million years. However,65 million years ago the age of the dinosaurs ended. Why they suddenly disappeared still remains a mystery. This disappearance made possible the rise of mammals on the earth. These animals were different from all life forms in the past, because they gave birth to young baby animals and produced milk to feed them. Finally about 2.6 million years ago some small clever animals, now with hands and feet, appeared and spread all over the earth. Thus they have, in their turn, become the most important animals on the planet. But they are not looking after the earth very well. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. As a result of this, many scientists believe the earth may become too hot to live on. So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.
The formation of
Paragraph 5:
Paragraph 1:
Paragraph 2:
Paragraph 3:
Paragraph 4:


Part 1
Part 2
the earth
life on the earth
The main idea of each part:
The development/evolution of
Paragraph 5:
Paragraph 1:
Paragraph 2:
Paragraph 3:
Paragraph 4:


The main idea of the whole text:
&
The formation of
The development/evolution of
the earth
life on the earth
Main idea of the text:
The text mainly tells us the formation of the earth and the development of life on it.
?

Read the passage part by part carefully and get some detailed information of the earth and life on it.
“Big Bang”
other bodies
________
stars


Earth: a cloud of _____



a solid _____
the earth’s _____________
other _____
Water: ____________ to the development of life




water vapour
nitrogen
Carbon dioxide





Form& combine
Form& combine
Settle into
Explode with fire and rock
produce
Part1 (Para.1-3): The formation of the earth
HOW LIFE BEGAN ON THE EARTH
No one knows exactly how the earth began, as it happened so long ago. However, according to a widely accepted theory, the universe began with a "Big Bang" that threw matter in all directions. After that, atoms began to form and combine to create stars and other bodies. For several billion years after the "Big Bang", the earth was still just a cloud of dust. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. The earth became so violent that it was not clear whether the shape would last or not. It exploded loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour and other gases, which were to make the earth's atmosphere. What is even more important is that as the earth cooled down, water began to appear on its surface.
Water had also appeared on other planets like Mars but, unlike the earth, it had disappeared later. It was not immediately obvious that water was to be fundamental to the development of life. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas. This produced a chain reaction, which made it possible for life to develop.
“Big Bang”
other bodies
________
stars


Earth: a cloud of _____


atoms
dust

a solid _____
the earth’s _____________
other _____
Water: ____________ to the development of life




water vapour
nitrogen
Carbon dioxide




globe
gases
atmosphere
fundamental

Form& combine
Form& combine
Settle into
Explode with fire and rock
produce
Part1 (Para.1-3): The formation of the earth
A cloud of energetic dust
A solid ball
Atmosphere
A world full of water
4
1
3
2

Combine into

Explode with fire and rock
dissolve harmful gases

Cool down
water



small ________ in water
_________ and all sorts of fish
green plants on land
The timeline of the development of life

Part2 (Para.4~5): The development of life

___________(on land and in water)
Forests and _______
________(on land)

land animals
small clever animals with ______________
(on land)
dinosaurs (on land)



Many millions of years later, the first extremely small plants began to appear on the surface of the water. They multiplied and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish. Next, green plants began to grow on land. They were followed in time by land animals. Some were insects. Others, called amphibians, were able to live on land as well as in the water. Later when the plants grew into forests, reptiles appeared for the first time. They produced young generally by laying eggs. After that, some huge animals, called dinosaurs, developed. They laid eggs too and existed on the earth for more than 140 million years. However, 65 million years ago the age of the dinosaurs ended. Why they suddenly disappeared still remains a mystery. This disappearance made possible the rise of mammals on the earth. These animals were different from all life forms in the past, because they gave birth to young baby animals and produced milk to feed them. Finally about 2.6 million years ago some small clever animals, now with hands and feet, appeared and spread all over the earth. Thus they have, in their turn, become the most important animals on the planet. But they are not looking after the earth very well. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. As a result of this, many scientists believe the earth may become too hot to live on. So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.

___________(on land and in water)
Forests and _______
________(on land)

land animals
water



small ________ in water
_________ and all sorts of fish
green plants on land
plants
shellfish
amphibians

reptiles
Part2 (Para.4~5): The development of life
The timeline of the development of life
insects
small clever animals with ______________
hands and feet
(on land)
mammals
dinosaurs (on land)



The Big Bang

water
Small plants
amphibians and insects
on land
Reptiles on land
mammals
advanced mammals
dinosaurs
Put the order of development into a timeline.
1. Insects and amphibians appeared.
3. The earth became a solid ball.
5. Reptiles appeared.
7. The earth was a cloud of dust.
9. Shellfish and other fish appeared.
11. Clever animals with hands and feet appeared.
2. Dinosaurs appeared.
4. Small plants grew on the water.
6. Plants began to grow on dry land.
8. Water appeared on the earth.
10. The universe began with a “Big Bang”.
12. Mammals appeared.
1
8
3
9
2
6
12
11
10
5
7
4

Try to use your own words to describe the process of the formation of the earth and development of life on the Earth. Use Exercise 2. on page 27 to help you.
1. The universe began with a “Big Bang”.
2. The earth was a cloud of dust.
3. The earth became a solid ball.
4. Water appeared on the earth.
5. Small plants grew on the water.
6. Shellfish and other fish appeared.


How life began on the earth
however, after that, next, later, finally, thus, as a result of this, and, but, because, ...
7. Plants began to grow on dry land.
8. Insects and amphibians appeared.
9. Reptiles appeared.
10. Dinosaurs appeared.
11. Mammals appeared.
12. Clever animals with hands and feet appeared.
1. What’s the writing style of the text?
2. In what order was the passage organized?
In time order.
How did the writer organize this passage？
A. Narrative 记叙文
B. Explanation 说明文
C. Essay 散文
B. Explanation 说明文
Obviously, we are facing some problems now. As teenagers what should we do to protect the earth?
Read the last paragraph again and pay attention to the underlined sentences.



Greenhouse effect and global warming
heat from the sun is trapped
temperature rises
Remember these three words:
reduce
reuse
recycle
Whether life will continue on the earth depends on us human beings.
1. Read aloud the text and retell the text.
2. Read aloud the text and underline some sentences that you think are difficult to understand.
3. Preview Reading ?.
Thanks

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