Unit;4;Astronomy-.docx

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1、Unit;4;Astronomy:unit4astronomy:thescienceoftheStarstypeoflesson:readingteachingobjectives:attheendoftheclass,studentswillbeableto1.gettoknowtheinformationaboutthedevelopmentoflifebyfinishingthemindmap;2.retellhowlifebegananddevelopedontheearthbrieflywiththemindmap.teachingprocedures:partileadin1.pl

2、ayapartofvideotoarousethestudents,interestandleadtothetopicofunit4.2.showthestudentsthepictureoftheeightplanetsandasksomequestions,leadingtothepassagehowlifebeganontheearth,ql:howmanyplanetstravelaroundthesun?q2:whichplanetisthemostimportantforus?q3:howistheearthdifferentfromotherplanets?q4:doyoukno

3、whowlifebeganontheearth?partiireadingstep1fastreadingforthemainideaandtheStructurel.askthestudentstonumbertheparagraphsandpayattentiontothefirstandthelastsentencesofeachparagraph.2.askthestudentstoreadthewholepassagequicklyandmatchthemainideaofeachparagraph,para.1thedevelopmentofplantsandanimalspara

4、.2theimportanceofwaterpara.3theformationoftheuniversepara.4thearrivalofhumanbeingspara.5theformationoftheearth3.checktheanswerandfindtheclueofthepassage:step2carefulreadingforthedetailedinformationparagraph1:askthestudentstoreadparagraph1andanswerthefollowingquestionstounderstandtheformationoftheuni

5、verse:ql:howdidtheuniversebegin?q2:whathappenedafterthe“bigbang”?q3:whatdoes“bodies“meanhere?a.personsoranimalsbodiesb.planetsandStarsparagraph2:askthestudentstoreadparagraph2andanswerthefollowingquestionstounderstandtheformationoftheearthandtheappearanceofwater:ql:whatwastheearthlikeforseveralbilli

6、onyearsafterthebigbang?q2:whatwastheearthlikebetween4.5and3.8billionyearsago?q3:whathappenednext?what,stheresultofit?4.dealwiththedifficultsentence,whatmadetheearth,satmosphere?theywereintimetoproducecarbon,nitrogen,watervapourandothergases,whichweretomaketheearthsatmosphere.paragraph3askthestudents

7、toreadparagraph3tounderstandtheimportanceofwater.1.askthestudentstotellwhetherthefollowingsentencesaretrueorfalse.(f)waterontheearthdisappearedlater.(t)waterwasnecessaryandimportanttothedevelopmentoflife.(t)waterwashelpfulindissolvingtheharmfulgasesandacidsintotheoceansandseas.2.helpthestudentsunder

8、standtheimportanceofwater,q:whatfactscanshowustheimportanceofwater?paragraph4-5:askthestudentstoreadparagraph4-5tounderstandthedevelopmentoflife.l.askthestudentstoreadthetwoparagraphsquickly,underlinethetimeandthenamesofdifferentplantsandanimalsmentionedinthetwoparagraphs.millionsofyearslater;next;l

9、ater;afterthat;65millionyearsago;2.6millionyearsago;smallplants;shellfishandfishes;greenplants;landanimals;insects;amphibians;forest;reptiles;dinosaurs;mammals;cleveranimals;2.checktheanswersinclass.3.askthestudentstodiscussingroupstofindthedevelopmentoflifeanddrawamindmaptoshowit.plantsanimals3.ask

10、somegroupstoshowtheirmindmapinclassandgiveageneraleplanation.step3postreading:1.remindthestudentsofthetitleandtheclueofthepassageonceagain,pointoutthestyleofthepassage:exposition2.allowthestudents3minutestopreparetheretellingandthenaskoneortwostudentstoretellthedevelopmentoflifewiththeirownwords,(th

11、ispartwillbeleftashomeworkifthereisnotenoughtime.)homework:1.retellthedevelopmentoflife,payattentiontotheconjunctions.2.explainthedifficultsentences划出主句，指出从句的种类，并翻译中文)1)whatitwastobecomewasuncertainuntilbetweenasolidglobe.2)theearthbecamesoviolentthatitwasnotclearwithfireandrock.3)whatisevenmoreimportantisthatonitssurface.4)itwasnotimmediatelyobviousthatwater.developmentoflife.5)whatmanyscientistsbelieveisthatoceansandseas.6)whytheysuddenlydisappearedstillremainsamystery.7)sowhetherlifewillcontinueontheearth.thisproblemcanbesolved.