人教版高中英语必修3 unit 4 Astronomy: the science of the stars---reading 课件（共30张PPT）

课件30张PPT。Unit 4Astronomythe science of the starsAstronomy ?Are you interested inStep 1A quiz on astronomyA Quiz Game 1. How many planets are there in the Solar System?
A. 6 B. 7 C. 8 D. 9
2. ______ of the earth surface is covered
by water.
A. 20% B. 30% C. 50% D. 70%3. How long does the rotation (自转) of the earth take?
A. 12 hours B. 24 hours C. a month D. 365 days
4. On what day is the Earth day celebrated?
A. April 22 B. May 4
C. August 21 D. November 113. Earth is the only planet moving around the sun.Part 2: True or FalseThe earth moves around the sun.TF2. It takes the earth one day to move around the sun.5. There is atmosphere on the moon.4. The earth is the only planet in the solar system which has living creatures.a year8 planets noFFTIn this unit, we’ll learn something more scientific.
1.What’s the title of the text?How life began on the earth
2 .Do you know some stories about how the universe began ?
Big BangPangu (盘古)GodNuwaHow life began on the EarthTask1 skimming1. How did the universe begin according to a widely accepted theory?
The universe began with a Big Bang. Task1 Fast reading Para1Task1 skimming
What’s the main idea of each Para?
Para.1
Para.2
Para.3
Para.4
Para.5A theory about how the universe began The arrival of humans and their impact on the earth
The importance of water for lifeThe development of plants and animals on the earthThe formation(形成) of the earthTask2 skimming Detailed reading
This text can mainly divided into two stages
Stage 1 : The development of the earth
Stage 2 : The development of life
(para 1—3)(para 4—5)a cloud of _____ Big Banga solid _______slowly combinethe earth ______ downit exploded loudly with _____ and _____the earth’s ___________dustball/globefire rockatmospherecooledHow did the earth come into being(产生）?Task 3 (para 2) Water appeared What appeared as the earth cooled down?water is important for the beginning of life on the earth. Stage2 The development of life1.insects
2.plants
3.reptiles
4.shellfish
5.fish
6.amphibians
7.dinosaurs
8.mammalsLook at the pictures and tell the groups .Para.4昆虫爬行类贝类两栖类恐龙哺乳类Study of the groups of life (生命的种类/物种)
Look at the pictures and tell the groups .1.insects(昆虫)
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖类）
7.dinosaurs(恐龙)
8.mammals(哺乳类)Study of the groups of life (生命的种类/物种)
Look at the pictures and tell the groups .1.insects
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖类）
7.dinosaurs(恐龙)
8.mammals(哺乳类)Study of the groups of life (生命的种类/物种)
Look at the pictures and tell the groups .1.insects(昆虫)
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖类）
7.dinosaurs(恐龙)
8.mammals(哺乳类)Study of the groups of life (生命的种类/物种)
Look at the pictures and tell the groups .1.insects(昆虫)
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖类）
7.dinosaurs(恐龙)
8.mammals(哺乳类)Study of the groups of life (生命的种类/物种)
Look at the pictures and tell the groups .1.insects(昆虫)
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖类）
7.dinosaurs(恐龙)
8.mammals(哺乳类)insects and amphibians appear
B. reptiles appear
C. shellfish and other fish appear
D. dinosaurs appear
E. small plants grow on the water
F. plants begin to grow on land
G. Mammals (including humans) appear Put them in a correct order!Para.4ECFABDGCan you fill in the blanks?234
567
8
9
101 small plants in watershellfish and all
sorts of fish insects reptilesamphibiansmammalsdinosaurs humansplantsanimalsGreen plants on landforests 1.Who are the small clever animals with hands and feet?
2. Are they taking care of the earth well? Why?
? Because they are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.The earth may become too hot to live on .global warming In the last paragraph, we know humans face seriously global warming problem, which is threatening our existence. Can you write something to call on us to protect our environment ?Discussion As young people, what little things can we do for the earth?Discussion solar energy plant trees recycle rubbish prevent desertificationsave water purify air The earth we live on is becoming more and more terrible, so we must take measures to deal with it

Firstly:
Secondly:
Thirdly:

We hope the environment will become more and more beautiful.Sample The earth we live in is becoming more and more terrible, so we must take measures to deal with it
Firstly, the government should pass laws to prevent people and factories from polluting the environment. Secondly, everyone should realize the importance of the problem and try their best to protect the environment and fight against pollution. Besides, it’s a good ideas to plant trees to improve the environment.
We hope our earth will become more and more beautiful.例文 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!