人教版英语必修3第四单元阅读.ppt

《人教版英语必修3第四单元阅读.ppt》由会员分享，可在线阅读，更多相关《人教版英语必修3第四单元阅读.ppt（44页珍藏版）》请在三一办公上搜索。

1、Unit 4,Astronomy,the science of the stars,What are in the pictures?,Mercury,Venus,Earth,Mars,Jupiter,Uranus,Saturn,Neptune,Do you know their origin?,Do you know the correct order of their distance to the sun?,nearest to the sun?,farthest to the sun?,What interests you in astronomy?,Quiz(测验）:,1.Who w

2、rote 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.8 C.9,3.Which one belongs to amphibian(两栖动物）?A.frog B.snake C.dinosaur,4.Who is famous for the theory of Black Hole theory?A.Hawking B.Newton C.Eins

3、tein,5.Which one belongs to reptile（爬行动物）?A.fish B.snake C.bird,8.On which planet are there 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,Whats

4、 the meaning of the word“Astronomy”?,I.Warming up,the science 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,Pluto,Scientist

5、s now think Pluto is too small to be called a planet.,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

6、.Do you know the names?,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,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 text?,4.From the title,we can predict th

7、at the text may tell us the origin of life on the earth.,How life began on the earth,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)When did dinosaurs disappear?5)Which animal is the most important one on t

8、he earth?,Para.4,Para.2,Para.3,Para.5,Para.1,6.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 of _ and _ on the earth.5)The arrival of _ and their _ on the earth.,theory,origin,earth,importance,pl

9、ants,animals,humans,influence/effect,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 directions.After that,atoms began to form and combine to create stars.,A.The earths atmosphere was formed,B.Big Bang,C.The earth explod

10、ed 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,1,2,3,4,5,6,7,Paragraph 2:Put these sentences into the right order.,Paragraph 3:,What does“Dissolve”mean?,“溶解”,Which the following statements is true?A.Unlike the e

11、arth,Mars had disappeared later.B.Water was to be fundamental to the development 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.,water,Plants in the water,Shell

12、fish and fish,Insects and amphibians,Reptiles,Dinosaurs,Mammals,Plants on land,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),Stage 1:The development of the earth,(1)After the Big Bang,what was the

13、 earth like?,a cloud of dust,a solid globe,exploded with fire and rock,produced water vapour and gases,(2)What happened next?,(3)What did the water vapour and gases form?,the earths atmosphere,Water appeared,(4)What appeared as the earth cooled down?,water is important for the beginning of life on t

14、he earth.,Why is water so important for the beginning of life?Because water allowed the earth to dissolve harmful gases into oceans and seas.,？,Stage2 The development of life,small plants appears in water,1.What life developed after water appeared?,Shellfish and all sorts of fish,2.What life develop

15、ed in water next?,green plants began to grow on land,insects appeared,3.What about the life on land?,amphibians on land and in the water,forests,4.What life developed next on land?,reptiles appeared,dinosaur developed,5.What life developed after forests appeared?,mammals on land,6.What life develope

16、d after dinosaurs?,small clever animals,7.What life developed after mammals?,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 in

17、to space.,The earth may become too hot to live on.,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 fish appeared.11.Clever animals with hands and feet appeared,2.Dinosaurs appeared.4.Small plants grew on the w

18、ater.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 developmentof life into a time line?,Ex.2 on P27,Ex.2 on P27,How life began on earth is one of the biggest puzzles that

19、 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 down?Why did water disappear on other planet?How did the dinosaur disappear?,summary,After the“big bang”,the earth was still just a cloud of _,

20、it _loudly with fire and rock,which were _ to produce the_,water vapour and other gases.Then _ began to appeared on the earth.,dust,exploded,in time,carbon,water,_ in water are considered to be the earliest lives on the earth.The O2they supplied encouraged the lives of_.Slowly green plants grew on l

21、and,which were followed by _like insects&_.When the plants grew into_,_ appeared.Then _ developed but 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

22、small plants,land animals,A widely accepted theory about the formation of the universe,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,Task 3:Close rea

23、ding,Because water and life remained on the earth.Because 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.,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:,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!,