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1、高一英語必修三高一英語必修三 UNIT 課文詳解課文詳解1.Nooneknowsexactlyhowtheearthbegan,asithappenedsolongago.沒有人確切知道地球是怎樣開始形成的,因為在很早很早以前地球就形成了。2.However,accordingtoawidelyacceptedtheory,theuniversebeganwithaBigBangthatthrewmatterinalldirections.然而,一種普遍為人們所接受的理論是:宇宙起源于一次大爆炸,這次大爆炸將物質投射到四面八方。3.Afterthat,atomsbegantoformandco
2、mbinetocreatestarsandotherbodies.然后,原子開始形成并結合成恒星和其他天體。Par 1第1頁/共43頁第2頁/共43頁第3頁/共43頁第4頁/共43頁1.ForseveralbillionyearsaftertheBigBang,theearthwasstilljustacloudofdust.大爆炸后好幾十億年過去了,但地球還只是一團塵埃。2.Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.隨后它會變成什么沒人能
3、知道,直到3845億年前,這團塵埃才慢慢地形成一個固體的球狀物。3.Theearthbecamesoviolentthatitwasnotclearwhethertheshapewouldlastornot.地球(開始)變得激烈動蕩,不知道這個固體形狀是否會繼續(xù)存在下去。Par 2第5頁/共43頁第6頁/共43頁第7頁/共43頁4.Itexplodedloudlywithfireandrock.Theywereintimetoproducecarbon,nitrogen,watervapourandothergases,whichweretomaketheearthsatmosphere.它(
4、地球)猛烈地爆炸噴出了烈火與巖石,最終產(chǎn)生了碳,氮氣,水蒸氣和其他多種氣體,從而形成了地球的大氣層。5.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.更為重要的是,地球冷卻了下來,地球的表面就開始出現(xiàn)了水。第8頁/共43頁第9頁/共43頁第10頁/共43頁1.WaterhadalsoappearedonotherplanetslikeMarsbut,unliketheearth,ithaddisappearedlater.在火星這些其他行星上都出現(xiàn)了水,但和地球不同的是,這些水后
5、來都消失了。2.Itwasnotimmediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.水對于生命的發(fā)展會起關鍵作用,這一點在當時并不明顯。3.Whatmanyscientistsbelieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.很多科學家相信,由于地球上長期有水存在,使得地球得以把有害氣體和酸性物質溶解在海洋里。4.Thisproducedachainr
6、eaction,whichmadeitpossibleforlifetodevelop.這就產(chǎn)生了一系列的反應,使得生命就有可能開始發(fā)展了。Par 3第11頁/共43頁1.Manymillionsofyearslater,thefirstextremelysmallplantsbegantoappearonthesurfaceofthewater.好幾百萬年后,水的表面開始出現(xiàn)了極小的植物。2.Theymultipliedandfilledtheoceansandseaswithoxygen,whichencouragedthelaterdevelopmentofearlyshellfisha
7、ndallsortsoffish.他們繁殖起來就使得海洋充滿了氧氣,這為早期的貝類及其他各種魚類后來的進化創(chuàng)造了條件。3.Next,greenplantsbegantogrowonland.Theywerefollowedintimebylandanimals.接著,綠色植物開始出現(xiàn)在陸地上。4.Somewereinsects.Others,calledamphibians,wereabletoliveonlandaswellasinthewater.隨后,陸地上出現(xiàn)了動物,其中有一些是昆蟲,另外一些叫兩棲動物,他們既能在陸上生活,也能在水里生存。Par 4第12頁/共43頁第13頁/共43頁
8、第14頁/共43頁5.Laterwhentheplantsgrewintoforests,reptilesappearedforthefirsttime.后來,當植物長成了森林的時候,爬行動物首次出現(xiàn)了。6.Theyproducedyoungentirelybylayingeggs.他們一般是通過孵蛋而繁衍后代的。7.Afterthat,somehugeanimals,calleddinosaurs,developed.再后來一些叫做恐龍的巨型動物出現(xiàn)了。8.Theylaideggstooandexistedontheearthformorethan140millionyears.他們也生蛋,
9、在地球上生存了一億四千多萬年。9.However,65millionyearsagotheageofthedinosaursended.然而,六千五百萬年前,恐龍時代結束了。第15頁/共43頁第16頁/共43頁10.Whytheysuddenlydisappearedstillremainsamystery.他們?yōu)槭裁磿蝗粶缃^至今仍是個謎。11.Thisdisappearancemadepossibletheriseofmammalsontheearth.恐龍的滅絕使地球上哺乳動物的增多有了可能。12.Theseanimalsweredifferentfromalllifeformsinth
10、epast,becausetheygavebirthtoyoungbabyanimalsandproducedmilktofeedthem.這些動物不同于以往所有的生物形態(tài),因為他們能從體內生產(chǎn)出幼仔并給幼仔哺乳。第17頁/共43頁1.Finallyabout2.6millionyearsagosomesmallcleveranimals,nowwithhandsandfeet,appearedandspreadallovertheearth.最后,大約260萬年前,一些小巧聰明,長著手腳的動物出現(xiàn)了,他們散布在地球的各個地方。2.Thustheyhave,intheirturn,become
11、themostimportantanimalsontheplanet.于是,他們接著成為這個行星上最重要的動物。3.Buttheyarenotlookingaftertheearthverywell.然而,他們對地球卻不怎么在意,Par 5第18頁/共43頁4.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.他們把過多的二氧化碳釋放到大氣層中,這使得地球上的熱不能釋放到太空中去。5.Asaresultofthis,manyscientis
12、tsbelievetheearthmaybecometoohottoliveon.因此,許多科學家相信地球可能會變得太熱而不適合生物生存。6.Sowhetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.所以,在未來的數(shù)百萬年中,生命能否在地球上延續(xù),取決于這個問題能否得到解決。第19頁/共43頁第20頁/共43頁第21頁/共43頁第22頁/共43頁第23頁/共43頁第24頁/共43頁第25頁/共43頁第26頁/共43頁 1.It is obvious t
13、o the students _ they should get well prepared for their future.A.as B.which C.whether D.that2._ wants to stay in a hotel has to pay their own way.A.Anyone B.The one C.Whoever D.Who練一練!練一練!第27頁/共43頁 3.It is not immediately clear _ the financial crisis will soon be over.A.since B.what C.when D.whethe
14、r練一練!練一練!第28頁/共43頁 _ leaves the room last ought to turn off the lights.A.Anyone B.The person C.Whoever D.Who _the sports meet will be held depends on the weather.A.Whenever B.If C.Whether D.That _ is a fact that English is being accepted as an international language.A.There B.This C.That D.It第29頁/共4
15、3頁第30頁/共43頁第31頁/共43頁第32頁/共43頁否用whetherImagine you are in this situation,and discuss whether you should do something at once.第33頁/共43頁第34頁/共43頁第35頁/共43頁第36頁/共43頁can hedoesnt she第37頁/共43頁1.Idoubtif/whetherhewillpasstheexam.2.Idontdoubtthatwewillwinthematch.3.Doyoudoubtthathediditonhisown?doubt問題肯定句中用肯
16、定句中用 if/whether否定句中用否定句中用 that疑定句中用疑定句中用 that1.I doubt _he is telling the truth.2.We never doubt _ the plan will be carried out.3.Does he doubt _ you are from Austria?4.Im doubtful _ he will agree to this.if/whetherthatthatif/whether第38頁/共43頁worried.The reason lies in that she works harder than the others do.賓語從句第39頁/共43頁been prepared to do _ it takes to save her life.A.whicheverB.howeverC.whateverD.whoever第40頁/共43頁第41頁/共43頁第42頁/共43頁感謝您的觀看。感謝您的觀看。第43頁/共43頁