How life began on the earth地球生命起源

ReadingHowlifebeganontheearthReading4.5-3.8billionyearsagomanymillionsofyearslater250millionyearsago65millionyearsagoSolongagoHowLifeBeganontheEarthPredictthemainideaandstructurefromthetitleandpicture（浏览标题和图片，预测大意和结构）1.Whatisthepassagemainlyabout?A.ThebirthoftheearthB.Whydinosaursdiedout.C.Theappearanceanddevelopmentoflifeontheearth.D.Thefactthathumanbeingscausedglobalwarming.2.Howisthepassagedevelopedaccordingtothepictureonpage26?A.inspaceorderB.intimeorderC.bygivingexamplesD.bycomparingPredictthemainideaandstructurefromthetitleandpicture（浏览标题和图片，预测大意和结构）1.Whatisthepassagemainlyabout?A.ThebirthoftheearthB.Whydinosaursdiedout.C.Theappearanceanddevelopmentoflifeontheearth.D.Thefactthathumanbeingscausedglobalwarming.2.Howisthepassagedevelopedaccordingtothepictureonpage26?A.inspaceorderB.intimeorderC.bygivingexamplesD.bycomparing√Paragraph1:Paragraph4:Paragraph5:(D)Theoriginoftheuniverse(E)Theformationoftheearth(A)Theimportanceofwaterforlife(B)Thedevelopmentofplantsandanimalsontheearth(C)ThearrivalofhumansandtheirinflunceontheearthParagraph2:Paragraph3:Task1:Readthetext

quicklyandfindoutthemainideaforeachparagraph.Checkyouranswersingroups.

Fast-reading（快读文本，获取大意）1073849615212111.

Insectsandamphibiansappeared.3.

Theearthbecamea

solidball.5.

Reptilesappeared.7.

Theearthwasacloudofdust.9.

Shellfishandotherfishappeared.11.

Cleveranimalswithhandsandfeetappeared.2.Dinosaursappeared.4.Smallplantsgrewonthewater.6.Plantsbegantogrowondryland.8.Waterappearedontheearth.10.Theuniversebeganwitha"BigBang".12.Mammalsappeared.2.

Puttheorderofdevelopment

oflifeintoatimelineaccordingtothereadingpassage.Task1:Guessthemeaningaccordingtothecontext.(根据上下文猜测词义）①.Whatdoestheunderlinedword“it”inparagraph3referto?WaterhadalsoappearedonotherplanetslikeMarsbutunliketheearth,ithaddisappearedlater.②.Whichsentenceinparagraph4istheclosestinmeaningtothefollowingone?Itisstillunknownwhythedinosaursdisappearedsuddenly.③.Whatdoestheunderlinedword“amphibians”inparagraph4referto?Theywerefollowedbylandanimals.Somewereinsects.Others,calledamphibians,wereabletoliveonlandaswellasinthewater.A.陆生动物B。水生动物C.水陆两栖动物waterWhytheysuddenlydisappearedstillremainedamystery.Carefulreadingformoredetails(细读文本，寻找细节）

Task2:Readparagraph2-5,andanswer:(1)Whathappenedontheearthafterthe“BigBang”?(2)Howdidwatercomeintobeing(形成）

ontheearth?(3)whatwastheimportanceofwater?④Isitwrongtoshowfilmswithdinosaursandpeopletogether?Why?⑤Whatproblemhasbeencausedbyhumans？

Carefulreadingformoredetails(细读文本，寻找细节）

acloudofdustasolidglobe

(1)Whathappenedontheearthafterthe“BigBang”?(2)Howdidwatercomeintobeing(形成）

ontheearth?Theearthcooleddown,waterbegantoappearonitssurface.⑶

whatwastheimportanceofwater?⑷Isitwrongtoshowfilmswithdinosaursandpeopletogether?Why?CarefulReadingformoredetails(细读文本，寻找细节）Itmadeitpossibleforlifetodevelop.Yes.Because65millionsofyearsagotheageofdinosaursended,butabout2.6millionyearsagothehumanbeingsappeared.

Theyareputtingtoomuchcarbondioxideintotheatmosphere，whichpreventheatfromescapingfromtheearthintospace.Theearthmaybecometoohottoliveon.⑸Whatproblemhasbeencausedbyhumans？Theearthisbecominghotterandhotter!1Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearontheearth.2

Whatmanyscientistsbelieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.

3.

Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsago

that与what的区别。that在从句中不能够充当句子成分，也没有含义；what可以在从句中作主语、表语、宾语或定语，意思是”什么，……的事情”

Importantsentences重点句式练一练，看一看你有多棒！（2011·北京）

BarbaraJonesofferstoherfansishonestyandhappiness.A.WhichB.WhatC.ThatD.Whom.(07全国Ⅱ) _mattersmostinlearningEnglishisenoughpractice.A.What B.Why C.Where D.Which〖06辽宁〗

makesthisshopdifferentisthatitoffersmorepersonalservices.A.What B.Who C.Whatever D.Whoever〖02上海〗_______fashiondiffersfromcountrytocountrymayreflecttheculturaldifferencesfromoneaspect.A.What

B.That

C.This

D.Which拯救地球（田震、零点乐队）.flvAsastudent,Whatdoyouthinkweshoulddotoprotecttheearthandmakeitabetterplacetoliveon.

Usefulexpressions：Inmyopinion……Personally……Ithink……AsfarasI’mconcerned,…..Don’t……Weshould/shouldn’t……Discussingroups(小组讨论）Savepaper:Giveawayyourbookstootherstoreuse.Usebothsidesofyourpaper.UseclothtowelsinsteadofpapertowelsornapkinsSaveelectricitybyturningoffthelightwheneverwearethelasttoleavetheclassroom

Saveeverydropofwater.Weshouldn’tleavewaterrunningwhilewebrushteeth.Gotoschoolbybikeoronfootinsteadofbycar.Takeanaturalgreenbagorbasketinsteadofaverythinplasticbagwhenyougoshopping.Plantmoretreesandgrowmoregrasscon