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1、人教版必修人教版必修(bxi)3(bxi)3Unit 4 Astronomy:the science of the starsUnit 4 Astronomy:the science of the starsHow Life Began on the Earthreadingreading第一页，共32页。Pangu separates the sky from the earth第二页，共32页。The Goddess Nuwa mended the heaven and created human beings from the clay(粘土粘土(zhn t).第三页，共32页。God
2、created the world in seven days第四页，共32页。Detailed reading This text can mainly divided into two stagesStage 1:The development of the earthStage 2:The development of life(para 13)(para 45)第五页，共32页。Stage 1:The development of the earth(1)After the Big Bang,what was the earth like?a cloud of dust a solid
3、 globe 第六页，共32页。exploded with fire and rock produced water vapour and gases(2)What happened next?第七页，共32页。(3)What did the water vapour and gases form?the earths atmosphere第八页，共32页。Water appeared(4)What appeared as the earth cooled down?water is important for the beginning of life on the earth.第九页，共3
4、2页。Why is water so important for the beginning of life?Because water allowed the earth to dissolve harmful gases into oceans and seas.第十页，共32页。Stage2 The development of life第十一页，共32页。small plants appears in water 1.What life developed after water appeared?第十二页，共32页。Shellfish and all sorts of fish 2.
5、What life developed in water next?第十三页，共32页。green plants began to grow on land insects appeared3.What about the life on land?第十四页，共32页。amphibians on land and in the waterforests4.What life developed next on land?第十五页，共32页。reptiles appeared dinosaur developed 5.What life developed after forests appea
6、red?第十六页，共32页。mammals on land6.What life developed after dinosaurs?第十七页，共32页。small clever animals7.What life developed after mammals?第十八页，共32页。1.Who are the small clever animals with hands and feet?2.Are they taking care of the earth well?Why?第十九页，共32页。Because they are putting too much carbon dioxid
7、e into the atmosphere,which prevents heat from escaping from the earth into space.The earth may become too hot to live on.第二十页，共32页。Can you fill in the blanks?23456789101 small plants in watersellfish and all sorts of fish insects reptilesamphibiansmammalsdinosaurs humansplantsanimalsGreen plants on
8、 landforests第二十一页，共32页。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 appeared2.Dinosaurs appeared.4.Small plants grew on the water.6.Plants began to grow o
9、n dry land.8.Water appeared on the earth10.The universe began with a“Big Band”.12.Mammals appeared.831091151741262Can you put the order of development of life into a time line?第二十二页，共32页。Group work:describe the video第二十三页，共32页。The earth is becoming hotter and hotter第二十四页，共32页。DiscussionWhat can we d
10、o to prevent the earth from becoming hotter and hotter?Eg.What we can do is to save energy.What we can do is to第二十五页，共32页。summaryAfter 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
11、on the earth.dustexplodedin timecarbonwater第二十六页，共32页。_ 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 but disapp
12、eared later,which made the rise of a totally different animal,_,possible,and finally _ spread all over the world.shell-fish and fishamphibiansforestsreptilesdinosaursmammalhumansThe small plantsland animals第二十七页，共32页。1.Finish the exercise 1and 2 on page 63 2.Read the text again and find out your dif
13、ficult points.Homework:第二十八页，共32页。1.How was the earth different from the other planets?Comprehension questions第二十九页，共32页。2.What made it possible for life to begin to develop?Comprehension questions第三十页，共32页。3.What are the differences between reptiles and mammals?Comprehension questions第三十一页，共32页。4.How did dinosaurs disappear?Comprehension questions第三十二页，共32页。