人教高中英语必修3 Unit 4 Astronomy: the science of the stars Warming up and reading (共27张PPT)

(共27张PPT)
Astronomy:
the science of the stars
Unit 4
Warming up and reading
How many planets travel around the sun?

地球 ______
木星 ______
火星 ______
水星 ______

海王星 _______
土星 ________
天王星 _______
金星 ________

Earth
Jupiter
Mars
Mercury
Neptune
Saturn
Uranus
Venus
THE SOLAR SYSTEM

3. How is the earth different from other planets?
2. Which planet is the most important for us?

the earth
life
Do you know how our life began on the earth?
Do you know any ancient idea about the beginning of the universe?


In Chinese culture …
Pangu separates the sky from the earth.





Nuwa mended the heaven and created
human beings from the clay.
In Western countries: God created the world and all living things.


How life began on the earth
Read the whole passage quickly and
match the main idea of each paragraph.
Para. 1
Para. 2
Para. 3
Para. 4
Para. 5
The importance of water
The formation of the universe
The arrival of human beings
The formation of the earth
The development of plants and animals





1. What is the original earth’s atmosphere made up of?
Answer the following questions.
Carbon, nitrogen, water vapour, and other gases.
2. Why did scientist believe water is fundamental to the development of life?
Because water allowed the earth to dissolve harmful gases and acids into the oceans and seas to ensure a following chain reaction, which made it possible for life to develop.
3. How did water come into being on the earth?
The explosion of the earth produced water vapor, which turned into water when the earth cooled down.
4. Which kind of life-being first appeared on the earth, plants or animals? Why?
At first, small plants began to appear on the surface of the water, they produced oxygen, which encouraged the later development of early shellfish and all sorts of fish.
5. Why were mammals different from all life forms in the past?
They were different because they produced their young from within their bodies and produce milk to feed them.
Let’s review the evolution(演变，进化 )of life on the earth.
After the “Big Bang”, the earth was full of water.
Original cells appeared in the ocean.


The cells in the water began to separate.
Marine(海中的) animals came into being.
Some animals (amphibian两栖动物 & insects)
came to land.
Reptile（爬行动物） appeared.
dinosaurs
mammals
Man had evolved from apes.
（ ）1 Insects and amphibians appeared.
（ ）2 Dinosaurs appeared.
（ ）3 The earth became a solid ball.
（ ）4 Small plants grew on the water.
（ ）5 Reptiles appeared.
（ ）6 Plants began to grow on dry land.
（ ）7 The earth was a cloud of dust.
（ ）8 Water appeared on the earth.
（ ）9 Shellfish and other fish appeared.
（ ）10 The universe began with a “Big Bang”.
（ ）11 Clever animals with hands and feet appeared.
（ ）12 Mammals appeared.
8
7
5
6
4
1
10
3
9

2
Put the order of development of life.
12
11
Whether life will continue on the earth depends on human beings.
Only if we care will we help;
only if we help shall all be saved!
solar energy
plant trees
recycle rubbish
prevent desertification
save water
purify air
What can we do to take care of the earth?
Homework

1. Collect more information about the
development of life and make a poster with
your group members.
2. Read and retell the passage to learn the
important and difficult language points.