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1、 Part One:Lead in What is this?Which planet is its home?This is ChangJiang7.It is an alien（外星的）（外星的） dog from outspace.Can you guess?1海王星海王星 Neptune水星水星Mercury 金星金星Venus 地球地球Earth 火星火星Mars 木星木星Jupiter 土星土星Saturn天王星天王星Uranus 2Scientists think Pluto is too small to be called a planet.Goodbye!3Life is
2、beginningUnit4 Reading How Life Began on the Earth4Part Two:A guessing gamesharp eyes, remeber quickly What can you see in the video?5Big Bangglobeatomviolent surfacewaterreptilealieneggsmammalsfishhuman beingsdinosaurcowboyatmosphere6Main ideaAfter watching the video clip, what is the main idea of
3、this passage?A brief introduction on how the _developed and how _ began on the earth.lifeearth7Para.1 Para.2Para.3Para.4Para.5 A theory about how the universe （宇宙）（宇宙）was formedThe formation(形成形成)of the earthThe importance of water for lifeThe development of plants and animalsThe arrival of humans a
4、nd their effects on the earthPart1: The development of _Part2:The development of_ Part Three:Fast reading the earthlife8Part Four：Careful ReadingStage 1: The development of the earth(para1-3)Task 1:Fill in the form on learning plan paper. (para1-2)(tips:Read the passage carefully , find some detaile
5、d information)9Time What happened to the earthAfter the Big Bang_ began to form and combine to_ stars and other bodies.Several billion years after the “Big Bang”The earth was still_.Between 4.5 and 3.8 billion yearsagoDust settled into _ .Atomsa cloud of dusta solid globecreate10Time What happened t
6、o the earthNextThe earth began to become_.It exploded to _ C/N, water vapor, etc, which made up_. As the earth _ began to _on its face.violentatmosphereproduceWaterappearcooled down11Big Bangatom? Atmosphere A solid ballwater学.科.网.A cloud of dust 121.Why was the earth different from other plantes?2.
7、Why is water so important for the beginning of life?13Task2:1.Why was the earth different from other plantes?A . It produced a lot of heat B . The water remained on the earthC . A cloud of dust was around the earthD . It was the oldest planet14 2.Why is water so important for the beginning of life?
8、Because water allowed the earth to dissolve harmful gases into oceans and seas, which made it possible to develop life.15Task3: Read para(4-5) and put the development of life in time order.(tips:Find out and underline key phrases which can show a time line, such as .later,.ago)Stage2: The developmen
9、t of the life (para4-5)16Manymillionsofyearslater,thefirstextremelysmallplantsbegantoappearonthesurfaceofthewater. Theymultipliedandfilledtheoceansandseaswithoxygen,whichencouragedthe later development of early shellfish and all sorts of fish.Next,greenplantsbegantogrowonland.Theywerefollowedin time
10、 by land animals. Some were insects. Others, calledamphibians,wereabletoliveonlandaswellasinthewater.Laterwhentheplantsgrewintoforests,reptilesappearedforthefirsttime.Theyproducedyounggenerallybylayingeggs.After that, some huge animals, called dinosaurs, developed.Theylaideggstooandexistedontheearth
11、formorethan140million years. However, 65 million years ago the age of thedinosaursended.Whytheysuddenlydisappearedstillremainsa mystery. This disappearance made possible the rise ofmammalsontheearth.Theseanimalsweredifferentfromalllifeforms in the past, because they gave birth to young babyanimalsan
12、dproducedmilktofeedthem.17Finallyabout2.6millionyearsagosome small clever animals, now withhandsandfeet,appearedandspreadallovertheearth.Thustheyhave,intheirturn,becomethemostimportantanimalsontheplanet.Buttheyarenotlookingaftertheearthverywell.Theyare putting too much carbon dioxideinto the atmosph
13、ere, which preventsheatfromescapingfromtheearthintospace. As a result of this, manyscientists believe the earth maybecometoohottoliveon.Sowhetherlife will continue on the earth formillions of years to come willdependonwhetherthisproblemcanbesolved.18想一想想一想（ ） Insects and amphibians appeared.（ ） Dino
14、saurs appeared.（ ） Small plants grew on the water.（ ） Reptiles appeared.（ ） Green plants began to grow on land.（ ） Shellfish and other fish appeared.（ ） Clever animals with hands and feet appeared.（ ） Mammals appeared.1 234567819Greenhouseeffect Task4:What problem is caused by human beings?(para5)pu
15、tting too much carbon dioxide into the atmosphereprevents heat from escaping from the earthinto spacetoo hot to live on20Whether 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!21Long long ago, there is an ancientcity called Han
16、dan.Handan Congtai22Fuyang River23亲，我是康德，亲，我是康德，我在雾霾中我在雾霾中.24空气污染，光靠戴口空气污染，光靠戴口罩可不管用罩可不管用.2526Part Five: DiscussionDiscuss in groups and give a report to the class.How can we control the air pollution and make our city a better place to live in?27summaryAfter the “big bang”, the earth was still just
17、 a cloud of _,it _loudly with fire and rock, which were _ to produce the_, water vapour and other gases. Then _ began to appear on the earth. dustexplodedin timecarbonwater28 _ in water are considered to be the earliest lives on the earth. The oxygen supply encouraged the lives of_. Slowly_ grew on
18、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 fishamphibiansforestsreptilesdinosaursmammalhumansThe small plantsland animalsgreen plants29Goodbye! Many thanks!30
