人教版英语必修3第四单元阅读课件.ppt

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1、Unit 4,Astronomy,the science of the stars,Unit 4Astronomythe science of,What are in the pictures?,What are in the pictures?,Mercury,Venus,Earth,Mars,Jupiter,Uranus,Saturn,Neptune,Do you know their origin?,Mercury Venus Earth Mars Jupit,Do you know the correct order of their distance to the sun?,near

2、est to the sun?,farthest to the sun?,Do you know the correct order,What interests you in astronomy?,What interests you in astronom,Quiz(测验）:,1.Who wrote the book The Origin of Species(物种起源)?A.Issaac Newton B.Albert Einstein C.Charles Darwin,2、How many big planets are there in the Solar System?A.7 B.

3、8 C.9,3.Which one belongs to amphibian(两栖动物）?A.frog B.snake C.dinosaur,Quiz(测验）:1.Who wrote the book,4.Who is famous for the theory of Black Hole theory?A.Hawking B.Newton C.Einstein,5.Which one belongs to reptile（爬行动物）?A.fish B.snake C.bird,4.Who is famous for the theory,8.On which planet are there

4、 lives at present?A.the Venus B.the Earth C.the Mars,7.Which gas is the most important for life?A.carbon dioxide(CO2)B.oxygen(O2)C.nitrogen(N2),6.Which one belongs to mammal（哺乳动物）?A.dinosaur B.dog C.fish,8.On which planet are there l,Whats the meaning of the word“Astronomy”?,I.Warming up,the science

5、 of stars;the scientific study of stars and planets.,2.What words will you think of when we talk about this topic?,star,planet,the sun/moon/earth,solar system,恒星 行星 太阳 月球 地球 太阳系,3.How many planets are in the solar system?,8,Whats the meaning of the word,Pluto,Scientists now think Pluto is too small

6、to be called a planet.,PlutoScientists now think Plut,II.Pre-reading,Have you ever asked your mother,“Mom,where do I come from”?,2.Nearly everybody has this or that puzzles:How do human beings come into being?How does the earth come into being?,3.In China,there are two legends（传说）about these puzzles

7、.Do you know the names?,II.Pre-readingHave you ever a,盘古开天辟地 女娲补天造人,4.In the western culture,who creates everything in the world?,The God,盘古开天辟地 女娲补,III.Fast-reading,Do you believe in such stories?Are they based on science?,2.In this unit,well learn something more scientific.3.Whats the title of the

8、 text?,4.From the title,we can predict that the text may tell us the origin of life on the earth.,How life began on the earth,III.Fast-readingDo you believ,5.Which question are you interested in in this text?,1)How old is the earth?2)How does the universe begin?3)Is there any water in the Mars?4)Whe

9、n did dinosaurs disappear?5)Which animal is the most important one on the earth?,Para.4,Para.2,Para.3,Para.5,Para.1,5.Which question are you inte,6.Conclude the main idea of each paragraph.1)A widely _ about the _ of the universe.2)The formation of the _.3)The _ of water for life.4)The development o

10、f _ and _ on the earth.5)The arrival of _ and their _ on the earth.,theory,origin,earth,importance,plants,animals,humans,influence/effect,6.Conclude the main idea of e,Paragraph 1:,1.A widely accepted theory was put up with.What is it?,The universe began with a“Big Bang”that threw matter in all dire

11、ctions.After that,atoms began to form and combine to create stars.,Paragraph 1:1.A widely accept,A.The earths atmosphere was formed,B.Big Bang,C.The earth exploded and produced kinds of gases,D.Water appeared,E.The earth cooled down,F.A cloud of energetic dust,G.Slowly combine into a solid globe,1,2

12、,3,4,5,6,7,Paragraph 2:Put these sentences into the right order.,A.The earths atmosphere was,Paragraph 3:,What does“Dissolve”mean?,“溶解”,Paragraph 3:What does“Dissolv,Which the following statements is true?A.Unlike the earth,Mars had disappeared later.B.Water was to be fundamental to the development

13、of life once water turned up.C.The continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.D.Water made it possible for life to develop.,Which the following statements,water,Plants in the water,Shellfish and fish,Insects and amphibians,Reptiles,Dino

14、saurs,Mammals,Plants on land,waterPlants in the waterShellf,Detailed reading This text can mainly divided into two stages,Stage 1:The development of the earthStage 2:The development of life,(para 13),(para 45),Detailed rea,Stage 1:The development of the earth,(1)After the Big Bang,what was the earth

15、 like?,a cloud of dust,a solid globe,Stage 1:The development of th,exploded with fire and rock,produced water vapour and gases,(2)What happened next?,exploded with fire and rock pr,(3)What did the water vapour and gases form?,the earths atmosphere,(3)What did the water vapour,Water appeared,(4)What

16、appeared as the earth cooled down?,water is important for the beginning of life on the earth.,Water appeared(4),Why is water so important for the beginning of life?Because water allowed the earth to dissolve harmful gases into oceans and seas.,？,Why is water so important,Stage2 The development of li

17、fe,Stage2 The development of lif,small plants appears in water,1.What life developed after water appeared?,small plants appears in water,Shellfish and all sorts of fish,2.What life developed in water next?,Shellfish and all sorts of fis,green plants began to grow on land,insects appeared,3.What abou

18、t the life on land?,green plants began to g,amphibians on land and in the water,forests,4.What life developed next on land?,amphibians on land and in the,reptiles appeared,dinosaur developed,5.What life developed after forests appeared?,reptiles appeared dinosaur d,mammals on land,6.What life develo

19、ped after dinosaurs?,mammals on land6.What life dev,small clever animals,7.What life developed after mammals?,small clever animals7,1.Who are the small clever animals with hands and feet?2.Are they taking care of the earth well?Why?,?,1.Who are the small clever,Because they are putting too much carb

20、on dioxide into the atmosphere,which prevents heat from escaping from the earth into space.,The earth may become too hot to live on.,Because they are putting too,1.Insects and amphibians appeared.3.The earth became a solid ball.5.Reptiles appeared.7.The earth was a cloud of dust9.Shellfish and other

21、 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 earth10.The universe began with a“Big Band”.12.Mammals appeared.,8,3,10,9,11,5,1,7,4,12,6,2,Can you put the order of developm

22、entof life into a time line?,Ex.2 on P27,Ex.2 on P27,1.Insects and amphibians appe,How life began on earth is one of the biggest puzzles that scientists found hard to solve.What other puzzles are hidden in the passage?,Discussion,Ex.5 on P27,How does the universe(earth)form?Why did the earth cool do

23、wn?Why did water disappear on other planet?How did the dinosaur disappear?,How life began on earth is one,summary,After the“big bang”,the earth was still just a cloud of _,it _loudly with fire and rock,which were _ to produce the_,water vapour and other gases.Then _ began to appeared on the earth.,d

24、ust,exploded,in time,carbon,water,summaryAfter the“big bang”,t,_ in water are considered to be the earliest lives on the earth.The O2they supplied encouraged the lives of_.Slowly green plants grew on land,which were followed by _like insects&_.When the plants grew into_,_ appeared.Then _ developed b

25、ut disappeared later,which made the rise of a totally different animal,_,possible,and finally _ spread all over the world.,shell-,-fish and fish,amphibians,forests,reptiles,dinosaurs,mammal,humans,The small plants,land animals,_ in water are c,A widely accepted theory about the formation of the univ

26、erse,The formation of the earth,The importance of water for life,The development of plants and animals on the earth,The arrival of humans and their impact on the earth,Task 1:Skimming,To seek key words,Main BodyParagraph 1:Paragrap,Task 3:Close reading,Because water and life remained on the earth.Be

27、cause plants provided oxygen for animals to breathe.Because dinosaurs died out long before human beings developed on the earth.The name is Pluto.Scientists now think it is too small to be called a planet.Human beings cause global warming.,Task 3:Close reading Because,make full use of solar energy,plant trees,recycle rubbish,save water,purify air,What can we do to take care of the earth?,Discussion:,make full use of solar energ,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!,Whether life will continue on,