人教版高中英语必修3：Book-3Unit-4-How-life-began-on-the-earth课件

How Life Began on the Earth Which planet（行星）（行星）is most special?Why?Task 1:planetplnit行星solarsulsystem太阳系Do you know some legends(传说传说)about the origins of life?In china.In west countries.Task 2:In Chinese culture_ separates(分分)the sky from the earth.Pangu 盘古盘古skyearth_ made human beings.Nuwa(女娲女娲)In western countries:_ created the world and all living things.God(上帝上帝)Pre-readingWhat scientific theory do you know?ReadingHOW LIFE BEGAN ON THE EARTHLets get to know how life began on the earthWhats the writing style of the text?A.Narrative 记叙文B.Explanation 说明文C.Essay 散文1111111111111111111111111111111111111111111111111111111An Explanation usually introduces something to somebody.Step 1.Fast readingReading strategy:Go through the passage for some information.Read the passage on P25 quicklyPara.1 Para.2Para.3Para.4Para.5 A theory about how the universe was formedThe formation(形成）形成）of the earthThe importance of water for lifeThe development of plants and animalsThe arrival of humans and their effects on the earthPart1:The development of the earthPart2:The development of life.Step2.Detailed-readingReading strategy:Read the passage carefully and try to get as much information as possible.Try to keep them in mind.Part1(para13)The development of the earth(1)After the Big Bang,what happened?(2)What happened to the solid globe next?(3)What did the water vapour and gases were to make?(4)What appeared after the earth cooled down?(5)What did the water do?How did the earth come into being?(1)After the Big Bang,what happened?a cloud of dust a violent solid ball Settled into_ _ exploded with fire and rock produced water vapour and gases(2)What happened to the solid globenext?In time_ _(3)What did the water vapour and gases were to make?the earths atmosphere_ Water appeared on its surface which is important for the beginning of life on the earth.(4)What appeared after the earth cooled down?_ _(5)What did the water do?It allowed the earth to dissolve harmful gases and acids into the oceans and seas._ Page 21a cloud of _ Big Banga solid _slowly combinethe earth _ downit exploded loudly with _ and _waterthe earths _dustball/globefire rockatmospherecooledHow did the earth come into being(产生）产生）?Big Bang A cloud of dust Atmosphere The earthA solid ballwaterPart2(para45)The development of lifeRead para4-5 carefully and make a timeline of the development of lifewater 1.2.10.3.4.insects(on land)5.6.7._8.dinosaurs(on land)9._ 11.small _ in water_ and all sorts of fishgreen plants on land _(on land and in water)forests (on land)(on land)small clever animals with _plantsshellfishamphibiansreptilesmammalshands and feet1.a timeline of the development of lifewaterPlants in the waterShellfish and fishPlants on landInsects and amphibiansReptiles Dinosaurs Mammals humans came into being and spread all over the world.Part2(para45)The development of lifeThe earth may become too hot to live on.vWhat problem is caused by human beings?DiscussionHave a discussion with your partner.we should not waste.you should.I think.save waterIt is a good idea to.Improve yourselfWe all know our earth is changing worse and worse,What can we do to take care of the earth?Only if we care will we help;only if we help shall all be saved!Whether life will continue on the earth depends on human beings.Writing:how can we protect our earth.Thank you very much.Good bye!