人教版英语必修3第四单元阅读课件.ppt

1、Unit 4the science of the the science of the starsstarsWhat are in the pictures?Mercury Venus Earth Mars Jupiter Uranus Saturn NeptuneDo 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.W

2、ho wrote the book The Origin of Species(1.Who wrote the book The Origin of Species(物种起源物种起源)?)?A.Issaac Newton B.Albert Einstein A.Issaac Newton B.Albert Einstein C.Charles Darwin C.Charles Darwin2 2、How many big How many big planetsplanets are there in are there in the Solar System?the Solar System

3、?A.7 B.8 C.9 A.7 B.8 C.9 3.Which one belongs to 3.Which one belongs to amphibian(amphibian(两栖动物）两栖动物）?A.frog B.snake C.dinosaur A.frog B.snake C.dinosaur 4.Who is famous for the theory of Black Hole 4.Who is famous for the theory of Black Hole theory?theory?A.Hawking B.Newton C.Einstein A.Hawking B.

4、Newton C.Einstein5.Which one belongs to 5.Which one belongs to reptilereptile（爬行动物）（爬行动物）?A.fish B.snake C.bird A.fish B.snake C.bird 8.On which planet are there lives at present?8.On which planet are there lives at present?A.the Venus B.the Earth C.the Mars A.the Venus B.the Earth C.the Mars7.Which

5、 gas is the most important for life?7.Which gas is the most important for life?A.A.carbon dioxidecarbon dioxide(CO(CO2 2)B.B.oxygenoxygen(O(O2 2)C.C.nitrogennitrogen(N(N2 2)6.Which one belongs to6.Which one belongs to mammal mammal（哺乳动物）（哺乳动物）?A.dinosaur B.dog C.fish A.dinosaur B.dog C.fish1.Whats t

6、he 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 恒星恒星 行星行星 太阳太阳 月球月球 地球地球 太阳系太阳系 3.How many planets are in the solar system?Scientists

7、 now think Pluto is too small to be called a planet.II.Pre-reading1.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）（传说）about these puzzle

8、s.Do you know the names?盘古开天辟地盘古开天辟地 女娲补天造人女娲补天造人 4.In the western culture,who creates everything in the world?III.Fast-reading1.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

9、that the text may tell us the origin of life 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 the earth?6.Conclude the main

10、 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.theoryoriginearthimportanceplantsanimalshumansinfluence/effectParagraph 1:1.A1.A widely accepted t

11、heory was put up with.widely accepted theory was put up with.What is it?What is it?The universe began with a The universe began with a“Big Bang”that threw matter “Big Bang”that threw matter in all directions.After that,in all directions.After that,atoms began to form and atoms began to form and comb

12、ine to create bine to create stars.A.The earths atmosphere was formedA.The earths atmosphere was formedB.Big BangB.Big Bang C.The earth C.The earth explodedexploded and produced and produced kinds of gases kinds of gasesD.Water appeared D.Water appeared E.The earth cooled downE.The earth cooled down

13、F.A cloud of energetic dustF.A cloud of energetic dustG.Slowly combine into a G.Slowly combine into a solid globesolid globe12345 67Paragraph 2Paragraph 2:Put these sentences into the right order.Put these sentences into the right order.Paragraph 3:Paragraph 3:I.I.What does“Dissolve”mean?What does“D

14、issolve”mean?“溶解溶解”Which the following statements is true?Which the following statements is true?A.Unlike the earth,Mars had disappeared later.A.Unlike the earth,Mars had disappeared later.B.Water was to be fundamental to the development of life B.Water was to be fundamental to the development of li

15、fe once water turned up.once water turned up.C.The continued presence of water allowed the earth to C.The continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and dissolve harmful gases and acids into the oceans and seas.seas.D.Water made it possible for

16、life to develop.D.Water made it possible for life to develop.waterPlants in the water Shellfish and fishInsects and amphibiansReptilesDinosaursMammalsPlants on land Detailed reading This text can mainly divided into two stagesStage 1:The development of the earthStage 2:The development of life(para 1

17、3)(para 45)Stage 1:The development of the earth(1)After the Big Bang,what was the 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

18、 as the earth cooled down?water is important for the beginning of life on the 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 lifeStage2 The development of life small plants appears in

19、water 1.What life developed after water appeared?Shellfish and all sorts of fish 2.What life developed in water next?green plants began to grow on land insects appeared3.What about the life on land?amphibians on land and in the waterforests4.What life developed next on land?reptiles appeared dinosau

20、r developed 5.What life developed after forests appeared?mammals on land6.What life developed after dinosaurs?small clever animals7.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

21、carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into 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 an

22、imals with hands and feet appeared2.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.831091151741262Can you put the order of developmentof life into a time line?Ex.2 on P27Ex

23、.2 on P27How life began on earth is one of the biggest puzzles that scientists found hard to solve.What other puzzles are hidden in the passage?Ex.5 on P27How 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

24、 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.dustexplodedin timecarbonwater _ in water are considered to be the earliest lives on the earth.The O2they supplied encour

25、aged the lives of_.Slowly green plants grew on land,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 fishamphibiansfo

26、restsreptilesdinosaursmammalhumansThe small plantsland animalsMain BodyParagraph 1:Paragraph 2:Paragraph 3:Paragraph 4:Paragraph 5: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 ear

27、th The arrival of humans and their impact on the earthTo seek key words1.1.Because water and life remained on the earth.Because water and life remained on the earth.2.2.Because plants provided oxygen for animals to Because plants provided oxygen for animals to breathe.breathe.3.3.Because dinosaurs d

28、ied out long before human Because dinosaurs died out long before human beings developed on the earth.beings developed on the earth.4.4.The name is Pluto.Scientists now think it is too The name is Pluto.Scientists now think it is too small to be called a planet.small to be called a planet.5.5.Human b

29、eings cause global warming.Human beings cause global warming.make full use of solar energy plant trees recycle rubbishsave water purify airWhat 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!