Unit4How-life-began-on-the-earth-优秀公开课课件.ppt

1、How life began on the earth,Pangu _the sky from the earth.,盘古开天辟地,Saying 1,separated,女娲补天,Nuwa mended the heaven and _human beings.,Saying 2,created,God _the world in seven days.,Saying 3,created,The development of Human from_.,Saying 4,monkey,Life was brought to the earth by ET from _space.,Saying

2、5,outer,1. What does the text tell us?,How the earth come into being The problem of the earth caused by human being How the human being build the earth How the life developed on the earth,Task1 Fast reading,Read the passage quickly and find out the answers to the questions below.,Task1 skimming,2.Ho

3、w did the universe begin according to a widely accepted theory?,The universe began with a Big Bang.,Task1 Fast reading,Task1 skimming,Whats the main idea for each Para?,Para.1 Para.2 Para.3 Para.4 Para.5,A theory about how the universe began,The arrival of humans and their impact（影响） on the earth,Th

4、e importance of water for life,The development of plants and animals on the earth,The formation(形成) of atmosphere and water on earth,Task2 careful reading,To be honest, none of us knows how the earth began because it happened too long ago.,True,Judge True or False,Para.1,Task3 Careful reading,Para.1

5、,How did the Big Bang create the universe?,First of all , it _ matter in all _. After that , _ began to _. Then, atoms _ to create _and _ .,threw,directions,atoms,form,combined,stars,other bodies,Para.2,1. What is the original earths atmosphere made up of?,carbon, nitrogen, water vapour, and other g

6、ases,The origin of life on the earth is an interesting question. It was a widely accepted _ that the universe began with a “Big Bang”, after which the earth was _. Between 4.5 and 3.8 billion years ago it settled into a solid _. The earth was very_ and exploded loudly with fire and rock. they were i

7、n time to produce carbon, nitrogen, water vapor and other gases, which were to make the earths _. Then as the earth cooled down, water appeared.,theory,a cloud of dust,globe,violent,atmosphere,Fill in the blanks:,Para.2,1. What makes the earth different from the other planets in the solar system? A.

8、 It produced a lot of heat. B. C. Water disappeared. D. It was the oldest planet.,The continued presence of water,Para.3,2. How did water help life develop?,Water allowed the earth to _ harmful gases and acids into the oceans and seas, producing a_.,dissolve,chain reaction,Para.3,1.insects 2.plants

9、3.reptiles（爬行类） 4.shellfish（贝类） 5.fish 6.amphibians（两栖类） 7.mammals(哺乳类),Look at the pictures and tell the groups .,Para.4,1.insects 2.plants 3.reptiles（爬行类） 4.shellfish（贝类） 5.fish 6.amphibians（两栖类） 7.mammals(哺乳类),Study of the groups of life Look at the pictures and tell the groups .,1.insects 2.plan

10、ts 3.reptiles（爬行类） 4.shellfish（贝类） 5.fish 6.amphibians（两栖类） 7.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.mammals(哺乳类),Study of the groups of life (生命的种类/物种) Look at the p

11、ictures 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.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.mammals(哺乳类),Study

12、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.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）

13、5.fish 6.amphibians（两栖类） 7.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 .,Human beings,Use the sentence in the text to describe the picture:,They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth

14、into space.,Para.5,greenhouse effect,The earth may become too hot to live on .,Finally about_ million years ago some small_ animals_, but they put lots of carbon into the atmosphere, _ heat escaping from the earth into space. As a result of it, life on earth is i_d_.,appeared,preventing,n anger,clev

15、er,Summary,Para.5,2.6,Group competition,1,2,5,4,3,6,How the earth came out,a cloud of _,Big Bang,a solid _,slowly combine,the earth _ down,it exploded loudly with _ and _,water,the earths _,Filling exercise(Para.1-2)(6),dust,ball/globe,fire rock,atmosphere,cooled,How life began on the earth,water,1.

16、,2.,10.,3.,4. insects (on land) 5.,6.,7._ 8. dinosaurs (on land) 9._,11._,small _ in water,_ and all sorts of fish,green plants on land,_(on land and in water),forests,(on land),(on land),small clever animals with _,Filling exercise(Para.4)(7),plants,shellfish,amphibians,reptiles,mammals,hands and f

17、eet,human beings,Questions:,How did water come into being on the earth?(Para.2)(2) 2) Why is important to have water on the earth?(Para.3)(2),The explosion of the earth produced water vapour, which turned into water when the earth cooled down.,It allowed the earth to dissolve harmful gases into ocea

18、ns and seas.,Translation,It was not immediately obvious that water was to be fundamental to the development of life.(4),水会对生命的发展起关键作用，这一点在当时并不明显。,In some films and stories, we can see dinosaurs and people together. Is it right? Why?(Para.4)(4),Because dinosaurs died out long before human beings deve

19、loped on the earth.,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.4,E,C,F,A,B,D,G,(4),Homework,1.Retell t

20、he development of life.,2.Review the new words and expressions in this unit.,use the vocabulary from the reading passage to replace the underlined parts,1. However, according to a well-known theory, the universe started with a great explosion. However, according to a widely accepted theory, the univ

21、erse began with a “Big Bang”.,2. The Big Bang threw matter in every direction. The Big Bang threw matter in all directions.,3.They were finally to produce carbon, nitrogen, water vapour and other gases. They were in time to produce carbon, nitrogen, water vapour and other gases.,4. It was not immedi

22、ately obvious that water was to be basic to the development of life fundamental,5. The extremely small plants spread and made the oceans and seas filled with oxygen.,The extremely small plants multiplied and filled the oceans and seas with oxygen.,6.Why they suddenly died out still remains a puzzle?

23、 Why they suddenly disappeared/extincted still remains a mystery.,7.This disappearance made possible the appearance of mammals on the earth. rise,8. Therefore, its their turn to become the most important animals on the planet. Thus , in their turn, they become the ,To live on the earth may become to

24、o hot. The earth may become too hot to live on.,fill in the blank with proper wh-,or that.,1.(_ it was to become )was uncertain until between4.5 and 3.8 billion years ago ( _ the dust settled into a solid globe).,what,when,2.The earth became so violent that it was not clear (_ the shape of being a solid globe would last or not). 3. They were in time to produce carbon, nitrogen, water vapour and other gases, (_ were to make the earths atmosphere).,wheth