一輪復(fù)習(xí)必修三第四單元-Astronomy

Astronomy:thescienceofthestarsModule3Unit4RevisionUnit4Astronomy:thescienceofthestarsrevision

Section1---TopicWriting你接受了一項(xiàng)寫(xiě)作任務(wù)，要為英語(yǔ)校報(bào)寫(xiě)一篇有關(guān)UFO的文章。請(qǐng)根據(jù)以下信息，簡(jiǎn)要介紹UFO。Unit4Astronomy:thescienceofthestars

名稱簡(jiǎn)介UFO是UnidentifiedFlyingObject的縮寫(xiě)世界十大未解之謎之一有關(guān)事件首次目擊報(bào)告是在1878年的美國(guó)從那以后目擊報(bào)告層出不窮，有許多是虛假的人們的看法來(lái)自其他行星的太空飛船來(lái)自其他行星的太空飛船外星人研究狀況三分之一的國(guó)家對(duì)UFO展開(kāi)研究大量關(guān)于UFO的圖書(shū)和期刊出版有些大學(xué)開(kāi)設(shè)UFO課程外星人

alien——精彩美文——

UFO,

whichisshortforUnidentifiedFlyingObject,haslongbeenregardedas

oneofthetop10unsolvedmysteriesintheworld.ThefirstUFOsightingwasreportedtohavehappenedinAmericain1878.Sincethen,numeroussightingshavebeenreportedallovertheworld,

manyofwhich

turnedouttobefalse.Unit4Astronomy:thescienceofthestarsSomepeoplethinkUFOsarespaceshipsfromotherplanets,othersbelievethatthey'rejustakindofnaturalphenomenonandstillothersguessthey'realiens.

NowaboutonethirdofthecountriesintheworldaredoingresearchonUFOs,aboutwhichmanybooksandjournalshavebeenpublished,

andinsomeuniversitiescoursesareevensetuptostudyUFOs.Unit4

Astronomy:thescienceofthestars——名師點(diǎn)睛——1．文章體裁：說(shuō)明文。2．行文邏輯：介紹UFO→人們的看法→研究狀況。3．詞匯短語(yǔ)：運(yùn)用了較高級(jí)的詞匯和短語(yǔ)。如：beshortfor(是……的簡(jiǎn)稱)，beregardedas(被認(rèn)為是……)，turnout(結(jié)果……)，setup(建立，成立)等。4．句式句法：運(yùn)用了多樣化的句式結(jié)構(gòu)。如：①定語(yǔ)從句：whichisshortforUnidentifiedFlyingObject,manyofwhichturnedouttobefalse,aboutwhichmanybooksandjournalshavebeenpublished；②賓語(yǔ)從句：thatthey'rejustakindofnaturalphenomenonandstillothersguessthey'realiens等。Unit4

Astronomy:thescienceofthestarsSectonII--VocabularyUsage1．Notlongagoav________earthquakeoccurredoffthecoastofIndonesia.2．Computerhackershavebrokendownsecuritys________，raisingquestionsaboutthesafetyofinformation.3．Saltd________inwaterandbecomespartofit.4．Hespentthewholeafternoonp________weedsinthegarden.5．Wheneverrecession(衰退)strikes,itsetsoffachainr________intheinternationalmoneymarkets.iolentystemeactionulling基礎(chǔ)自主檢測(cè)issolvesUnit4

Astronomy:thescienceofthestars6．Thereisafriendly________(氣氛)ofhelpingeachotherwithdifficultiesinstudyinourclass.7．Therearemany________(理論)abouttheoriginoflife.8．Herschoolreportshowsthatsheisweakinmathsand________(生物學(xué))．9．Hewasinterestedin________(天文學(xué))andalwaysstayedupatnighttowatchthestars.10．6________(乘)by5is30.theoriesatmospherebiologyastronomymultipliedUnit4

Astronomy:thescienceofthestarsⅡ.短語(yǔ)檢測(cè)1．Istayeduplatelastnight,sotodayIcan't________________(振作)．2．________________(既然)youhavegrownup,youshouldnotdependonyourparents.3．________________(留神)thecarswhenyoucrossthestreet.4．Thisnewcountry________________(成立，存在)in1951.5．Weputacurtainacrossthewindowto________________(擋住)thesunlight.cheerupNowthatWatchoutforblockoutcameintoexistenceUnit4

Astronomy:thescienceofthestars6．Pressthebuttonwhenthelightgoeson—youwillsoon________________(掌握)it.7．Peopletrytoavoidpublictransportationdelaysbyusingtheirowncars，andthis________________(反過(guò)來(lái))createsfurtherproblems.8．Hehas________________(大量)letterstoanswerandhastoworkfrommorningtonight.9．Theaudienceclappedtheirhands________________(合拍，及時(shí))tothemusic.10．Somepeoplefeeleasyandcomfortabletobeservedbyothersbutwhentheyareaskedtoserveothers_________(輪到他們),theyareunwillingorevenhatetodoso.getthehangofinturnmassesofintheirturnintimeUnit4

Astronomy:thescienceofthestars基礎(chǔ)自主檢測(cè)Unit4Astronomy:thescienceofthestarsSection3--TextRevisionTask1-ListenforthemainideaTaskTwo--.課文回憶Differentreligionsandcultureshavetheirownideasabouthowtheuniversecameinto1.____________.Accordingtoa2.________(wide)acceptedt______,theuniversebeganwitha“BigBang”______3.________(explode)loudlywithfireandrockandthrewmatterinalldirections.Severalbillionyearsafterthat,thedust4.________(settle)intoasolidglobe,theearth,wherethe5.________(continue)presenceofwatermakeslifepossible.Lifedevelopedfrom6.________plantstocomplicatedmammals,movingfromwatertoland.Atlast,mammalssawanewspecies7.________(appear),human,whichspreadalloverthebeing/existenceUnit4

Astronomy:thescienceofthestarswidelyexplodedsettled

continuedsimpleappearingearth.Togetherwiththeircivilization,aseriesofproblemshave8.________(arise),makingtheearthfarfromaparadise.9.________lifewillsurviveontheearthformillionsofyears10.________(come)willdependonwhethertheproblemscanbesolved.arisentocomeUnit4

Astronomy:thescienceofthestarsWhetherParagraph1:Paragraph2:Paragraph3:Paragraph4:Paragraph

5:D.AwidelyacceptedtheoryabouttheformationoftheuniverseC.Theformation(形成〕oftheearthA.TheimportanceofwaterforlifeB.ThedevelopmentofplantsandanimalsontheearthE.ThearrivalofhumansandtheirimpactontheearthTask2-Glanceandfindthemainideaofeachparagraph(2)Writedownthemainideaforeachparagraphandanalyse(分析〕itsstructure〔結(jié)構(gòu)〕.TaskThree---佳句再現(xiàn)1．Theearthbecame____________________itwasnotclearwhethertheshapewouldlastornot.地球變得劇烈動(dòng)亂，不知道這個(gè)形狀是否會(huì)繼續(xù)保持下去。2．Thisproducedachainreaction,____________________________forlifetodevelop.這引起了連鎖反響，為生命的開(kāi)展提供了可能。3．ButwhenItriedtostepforward,IfoundIwascarried____________________ontheearthandfellover.但當(dāng)我努力向前邁步的時(shí)候，我覺(jué)察我被送出去很遠(yuǎn)，步子的跨度竟是在地球上的兩倍，因而我摔倒了。soviolentthatwhichmadeitpossibleUnit4

Astronomy:thescienceofthestarstwiceasfaras4．So______________________ontheearthformillionsofyearstocomewilldependon_________________________________．所以，在未來(lái)的數(shù)百萬(wàn)年中，生命能否在地球上延續(xù)取決于這個(gè)問(wèn)題能否得到解決。5．Asaresultofthisevent,agreatdustcloudformedinthesky__________________________.由于這一事件，天空中形成一大團(tuán)塵埃，遮住了陽(yáng)光。whetherlifewillcontinueblockingoutthesunlightUnit4

Astronomy:thescienceofthestarswhetherthisproblemcanbesolved

單詞點(diǎn)睛

1

harmful

adj.有害的；傷害的(causingorcapableofcausingharm)(1)beharmfulto

對(duì)……有害(2)dosbharm/doharmtosb傷害某人Thereis(no)harmin(sb's)doingsth(某人)做某事有(無(wú))害處(3)harmn．&vt.損傷；傷害harmlessadj.無(wú)害的Unit4

Astronomy:thescienceofthestarsTaskFour---Languagepoints【活學(xué)活用】(1)[2015?江蘇卷?閱讀B]Evenwhenthemachinesarerecycledandtheharmfulmetalsremoved,therecyclingprocessofteniscarriedoutinpoorcountries…甚至當(dāng)這些機(jī)械裝置被回收，有害的金屬被去除，這些回收過(guò)程經(jīng)常是在貧窮國(guó)家進(jìn)行的……(2)Yoursmokingcanbeharmful________thehealthofyourchildren.你吸煙會(huì)危害到你的孩子的健康。toUnit4

Astronomy:thescienceofthestars(3)Itneveroccurredtohimthathiscarelessnesscoulddo____________________tohimself.他從未想到他的粗心會(huì)對(duì)自己造成如此巨大的傷害。(4)Hehasgotintothebadhabitofreadingonthebed,__________________________hiseyesight.他已養(yǎng)成了在床上看書(shū)的壞習(xí)慣，這習(xí)慣對(duì)他的視力有害。suchgreatharm返回目錄whichisharmfulto/doesharmtoUnit4

Astronomy:thescienceofthestars2exist

vi.存在；生存(1)existonsth(＝liveonsth)靠某物生存existin…存在于……之中existas…作為……而存在，以……形態(tài)存在Thereexists…有/存在……(2)existencen.存在inexistence現(xiàn)存的；現(xiàn)有的comeintoexistence產(chǎn)生；存在bringintoexistence使發(fā)生；使產(chǎn)生；使成立[溫馨提示]exist沒(méi)有被動(dòng)語(yǔ)態(tài)，也不能用于進(jìn)行時(shí)態(tài)。Unit4

Astronomy:thescienceofthestars【活學(xué)活用】(1)[2015?重慶卷?閱讀E]Worksofthistype,hebelieved,spoketodeepandunvaryingfeaturesofhumannatureandcouldcontinuetoexistovercenturies.他認(rèn)為，這種類型的作品跟人性深層的不變的特性對(duì)話，能繼續(xù)存在好幾個(gè)世紀(jì)。(2)Nooneknowswhensuchacustomfirst________________________.沒(méi)有人知道這種風(fēng)俗是什么時(shí)候開(kāi)始有的。Unit4

Astronomy:thescienceofthestarscameintoexistence/being(3)Fromthestartingpointtodestination,__________________alongdistance.從起點(diǎn)到終點(diǎn)有很長(zhǎng)一段距離。(4)Whenyoufeelthatsomeoneisthreateningyour________，youfightbacktosaveyourself.當(dāng)你感覺(jué)有人威脅到你的生存時(shí)，你會(huì)還擊以拯救自己。Unit4

Astronomy:thescienceofthestarsthereexistsexistence3

preventv．阻止；制止prevent/stop/keep…fromdoingsth阻止……做某事protect…from保護(hù)……不受……侵襲；擋?。环烙鵮eep…doingsth使……一直做某事Unit4

Astronomy:thescienceofthestars[溫馨提示](1)在主動(dòng)語(yǔ)態(tài)中，stop/prevent…fromdoingsth中可省去from，而keep…fromdoingsth中的from不可省略；在被動(dòng)語(yǔ)態(tài)中，這三個(gè)搭配中的from均不可省略。(2)在protect…from結(jié)構(gòu)中，from后接能帶來(lái)傷害或損害之物。Unit4

Astronomy:thescienceofthestars【活學(xué)活用】(1)[2015?全國(guó)卷Ⅱ?閱讀七選五]Asalways，youshouldstretchatleasttenminutesbeforeeachruntopreventinjuries.像往常一樣，在每次開(kāi)跑之前，你應(yīng)該伸展四肢至少十分鐘，以防止受傷。(2)Iamverysorrythatapreviousengagementpreventsme________________yourkindinvitation.很抱歉，因?yàn)槲以缫延屑s會(huì)所以不能接受你好意的邀請(qǐng)。(from)acceptingUnit4

Astronomy:thescienceofthestars(3)Everypossiblemeansshouldbetakentopreventtheriverfrom__________________.應(yīng)該采取各種可能的措施來(lái)防止這條河流受到污染。(4)Unlesswegetmorefundingwe'll________________finishingourexperimentalprogramme.除非我們得到更多的經(jīng)費(fèi)，否那么我們將無(wú)法完成實(shí)驗(yàn)工程。beingpollutedbepreventedfromUnit4

Astronomy:thescienceofthestarspuzzle

n.謎；難題vt.&vi.(使)迷惑；(使)為難(1)beinapuzzle不知如何是好beinapuzzleabout…對(duì)……迷惑不解(2)puzzleover/about苦苦思索；仔細(xì)琢磨(3)puzzledadj.迷惑的；不解的puzzlingadj.令人迷惑的bepuzzledby…被……迷惑Unit4

Astronomy:thescienceofthestars[溫馨提示]puzzled意為“迷惑的，不解的”，往往用于指人或人的表情、臉色、聲音等；puzzling意為“令人迷惑的，讓人不解的”，往往指物。Unit4

Astronomy:thescienceofthestars

【活學(xué)活用】(1)[2015?四川卷?閱讀E]PeoplehavelongpuzzledoverhowtheEgyptiansmovedsuchhugerocks.人們很長(zhǎng)時(shí)間以來(lái)一直困惑，古埃及人是如何移動(dòng)如此巨大的石塊的。(2)Thereportersaswellassomecriticsremained________bytheelectionresults.一些批評(píng)家和記者們?nèi)匀粚?duì)這次大選的結(jié)果困惑不解。Unit4

Astronomy:thescienceofthestarspuzzled

(3)__________________________mostwasthattheycouldnotfindthecauseofthedisease.最使醫(yī)生們困惑的是他們無(wú)法查出病因。(4)Howtheydiscovereditstillremains__________．他們是如何發(fā)現(xiàn)它的仍是個(gè)謎。Unit4

Astronomy:thescienceofthestarsWhatpuzzledthedoctorsapuzzlepull

n.&vt.拉(力)；拖；牽引力pullback拉回來(lái)；縮回；使后退pulldown拉下(窗簾等)；拆毀；拆掉(房屋等)pullout拔出；(列車等)駛出，出站；脫離pullin(列車等)駛進(jìn)，到站；(船)靠岸pulltogether齊心協(xié)力；通力合作pullthrough(使)渡過(guò)危機(jī)/難關(guān)；康復(fù)pull…up把……往上拽Unit4

Astronomy:thescienceofthestars【活學(xué)活用】(1)[2014?新課標(biāo)全國(guó)卷Ⅱ?完形]ItwasimpossibleforJoetoclimbbackorforSimontopullhimup.喬爬回來(lái)或者西蒙把他拽上來(lái)都不太可能。(2)Everyonewasveryconcernedwhetherhewouldpull________ornot.每個(gè)人都很擔(dān)憂他是否能夠挺過(guò)去。(3)Theyweresodeeplyinvolvedinthematterthattheyfoundithardtopull________.他們?cè)谀莻€(gè)問(wèn)題上陷得太深，以至于難以自拔。(4)Itiseasiertopull________thantobuildup.敗事容易成事難。throughUnit4

Astronomy:thescienceofthestarsoutdown單詞及時(shí)練用適當(dāng)?shù)脑~或所給詞的適當(dāng)形式填空1．Whatmakesme________(puzzle)iswhyheleftthecountrywithouttellinganyone.2．His________(present)atthemeetingtookusabackforhewassupposedtobeonabusinesstourthen.3．Animal________(extinct)isatacriticalpointthaturgentactionshouldbetakentoprotectsomespeciesfromdyingout.4．Themedicationhelpsto________(less)yourpainandreducesufferings.Unit4

Astronomy:thescienceofthestarspuzzledlessenpresenceextinction5．Thelongtalk________(exhaust)mystrengthandpatience.Eventually,Iburstout.6．Shestronglyobjectedtomymother'smarriage.Surprisingly,mymother'sreaction________itwasrathercalm.7．Theconstitution,unlikeotherformsoflaws,isfundamentalto________(keep)oursocialsystemworkingproperly.8．Thegovernmenthastoclosethosesmallfactoriestopreventthewateroftheriver______________________(pollute)．9．Thereisalotofrubbish________(float)onthesurfaceoftheriver.Unit4

Astronomy:thescienceofthestarsexhaustedkeepingtobeingpollutedfloating10．Thespacemenhavealreadygotaccustomedtoitthattheywillfly______________(weightless)inspace.Unit4

Astronomy:thescienceofthestarsweightlessly

短語(yǔ)儲(chǔ)存

1intime(soonerorlater)遲早；(eventually)最后；(earlyorsoonenough)及時(shí)ontime

準(zhǔn)時(shí)allthetime一直，始終atonetime曾經(jīng)，一度atatime每次，逐一fromtimetotime有時(shí)，偶爾innotime立刻，馬上timeandtimeagain一次又一次，一再Unit4

Astronomy:thescienceofthestars[溫馨提示]intime后可接forsth/todosth的形式，意為“做某事及時(shí)/來(lái)得及”。Unit4

Astronomy:thescienceofthestars【活學(xué)活用】(1)[2015?四川卷?閱讀C]Investingintimeforparentingandraisingrelationshipsismoneywellspent.及時(shí)地在為人父母和養(yǎng)育關(guān)系上投入的錢是值得花的。(2)用time的相關(guān)短語(yǔ)填空①Ifyoukeepon,you'llsucceed____________．②Thecarcametoastopjust____________topreventanaccident.③____________，halfthelandontheearth'ssurfacewascoveredbytheforest.④We'llhavehadtheleakfixed______________．Unit4

Astronomy:thescienceofthestarsintimeintimeAtonetimeinnotime2cheerup快樂(lè)起來(lái)；振作精神(1)cheersbup使某人振作起來(lái)cheersbon(比賽中)以喝彩聲鼓勵(lì)；為某人加油cheerfor為……而歡呼(2)Cheers干杯！wordsofcheer鼓勵(lì)的話Unit4

Astronomy:thescienceofthestars【活學(xué)活用】(1)[2014?福建卷?閱讀A]Sowewentovertotheflowersellerandaskedherifwecouldbuyaflowerfortheladytocheerherup.因此，我們?nèi)チ速u花人那里，問(wèn)她我們能否為那位女士買朵花讓她振作起來(lái)。(2)Iftheywinthefinaltonight,theteamaregoingtotouraroundthecity__________________bytheirenthusiasticsupporters.如果他們贏了今晚的決賽，隊(duì)員們將會(huì)巡游全城，接受熱心支持者的歡呼。Unit4

Astronomy:thescienceofthestarstobecheered5．Doctorssaymanydiseasescanbe________________spreadingbywashingourhands.6．Excuseme,sir?Wouldyoumindmovingalittlebittotheleft?Youare________________myviewofthescreen.7．Wehavetoclosely________________anymovementsoftheenemytroopsalongthebordersothatwewon'tbeattackedwithoutwarning.8．Iwasabouttoknockonthedoorwhenitwasopened________________．preventedfromUnit4

Astronomy:thescienceofthestarsblockingoutwatchoutforfromwithinⅡ.深度演練用與break的相關(guān)短語(yǔ)填空1．Quarrelsoften________________(爆發(fā))betweenthewifeandhusbandbuttheybothwishtotakemeasurestopreventthemfromlivinghappily.2．Shallwe________________(中斷)ourdiscussionandhavesometeaorcoffee，please?3．Becarefulwhenyouopenanunknowndocument.Itmightcontainthedeadlyviruswhichcouldentirely________________(使崩潰)yourcomputersysteminaminute.breakoutUnit4

Astronomy:thescienceofthestarsbreakoffbreakdown4．He________________(插話)withsomeideasofhisownandwoneveryone'ssupport.5．Wemust________________(破除)theseoldcustoms,fortheyareharmfultosociety.6．Theband________________(解散)andeachtooktheirownpathseparately.brokeinUnit4

Astronomy:thescienceofthestarsbreakawayfrombrokeup

句型透視

1ButwhenItriedtostepforward,IfoundIwascarriedtwiceasfarasontheearthandfellover.但當(dāng)我努力向前邁步的時(shí)候，我覺(jué)察我被送出去很遠(yuǎn)，步子的跨度竟是在地球上的兩倍，因而我摔倒了。句型公式…倍數(shù)＋as＋形容詞/副詞＋as…Unit4

Astronomy:thescienceofthestarsTaskFive---Sentencestructure【句式點(diǎn)撥】該句型表示“……是……的幾倍”，該句型也可用half,onefourth等詞，表示“……是……的一半/四分之一等”。常見(jiàn)的倍數(shù)的表達(dá)方式有：(1)倍數(shù)＋as＋形容詞/副詞原級(jí)＋as…(2)倍數(shù)＋形容詞/副詞比較級(jí)＋than…(3)倍數(shù)＋thesize/height/weight/depth/…＋of…(4)倍數(shù)＋asmany/much＋名詞＋as…Unit4

Astronomy:thescienceofthestars【活學(xué)活用】(1)Globalwarmingisheatingtheplanettwiceasquicklyaspreviouslyfeared.全球變暖致使地球加熱的速度是人們以前擔(dān)憂的兩倍。(2)ThegravityonthesurfaceofMarsisabout__________________asitisontheearth.(strong)火星外表的引力大約是地球外表引力的三分之一。Unit4

Astronomy:thescienceofthestarsonethirdasstrong

(3)Kenya,alandmorethan________________Britain,iseverywhereparched.(size)肯尼亞，一個(gè)面積是英國(guó)兩倍多的地方，四處干旱炎熱。(4)Someofthedoctorsarepaidalmost______________asthenurses.(much)有些醫(yī)生的薪水差不多是護(hù)士的兩倍。Unit4

Astronomy:thescienceofthestarstwicethesizeoftwiceasmuchThisproducedachainreaction,whichmadeitpossibleforlifetodevelop.這引起了連鎖反響，為生命的開(kāi)展提供了可能。句型公式makeitpossible…使……成為可能Unit4

Astronomy:thescienceofthestars【活學(xué)活用】(1)Thegirlknowsthreeforeignlanguages,whichmakesiteasierforhertofindagoodjob.這個(gè)女孩懂三門外語(yǔ)，這使她更容易找到一份好工作。(2)Nomatterwhereheis,hemakes________aruletogoforawalkbeforebreakfast.無(wú)論他在哪里，他都習(xí)慣在早飯前去散散步。(3)Ihate________thatyou'renotaround.Andthefactwasthatyoudidn'tcall.我討厭你不在身旁，而事實(shí)上你也沒(méi)打來(lái)。Unit4

Astronomy:thescienceofthestarsitit句型及時(shí)訓(xùn)Ⅰ.用適當(dāng)?shù)脑~或所給詞的適當(dāng)形式填空1．Overtheyearsshehadtriedherbest_____________(block)theterriblememory,butinvain.2．Duringthosefouryears,heworkeddayandnight,thus__________(improve)histheorygraduallyuntilitwascomplete.3．Theargumentremainsextremelyheatedwhethertherearenecessaryconditionsof________(exist)suchaswateronMars.4．Wewatched,________(amaze)asfirebrokeoutontheoutsideofthespaceship.Unit4

Astronomy:thescienceofthestarstoblockoutimprovingexistenceamazed5．Theprofessorconsiders________nogoodreadingwithoutunderstanding.Ⅱ.完成句子1．Thoughit'sachallengingjob,hedidit____________________(三分之一的時(shí)間)ittookme.2．Thoughthisisnot________________________(一樣好的一本書(shū))asweexpected,itisstillworthreading.(as…as)3．______________(有)acertaindoubtamongtheworkersastothenecessityofthework.(exist)Unit4

Astronomy:thescienceofthestarsitonethirdthetimeasgoodabookThereexisted

4．Tobeautifyourcity,alargenumberofoldhousesalongthestreet____________________________(已經(jīng)被撤除)uptothepresent.(pull)5．AnAirFrancejetisreported____________________(墜毀)intheAtlanticOceanwith228peopleaboard,whichistheairline'sworstdisasterinits75-yearhistory.(crash)Unit4

Astronomy:thescienceofthestarshavebeenpulleddown

tohavecrashedⅠ.根據(jù)提示翻譯句子1．地球上動(dòng)植物千姿百態(tài)，相互喂哺(feedoff)。有些動(dòng)物產(chǎn)卵(layeggs)來(lái)繁殖后代，有些哺乳動(dòng)物直接生(givebirthto)幼崽。________________________________________________________________________________________________________________________________________________2．為了更好的生存環(huán)境，讓我們振作起精神(cheerup)，一起努力。___________________________________________________3．地球是廣闊的太陽(yáng)系中的一顆行星。不像(unlike)其他的行星，地球上有生命存在(exist)，但生命的起源依舊是個(gè)謎(puzzle)。__________________________________________________________________________________________Unit4

Astronomy:thescienceofthestarsSection5---PassageWritingpracticeLet'scheerupandworktogetherforabetterlivingenvironment.Theearthisoneoftheplanetsofthegiantsolarsystem.Unlikeotherplanets,lifeexistsontheearth,butlife'soriginisstillapuzzle.Thereexistsagreatvarietyofplantsandanimalsontheearththatfeedoffeachother.Someanimalslayeggstocontinuethespecieswhilesomemammalsgivebirthtobabiesdirectly.4．既然(nowthat)我們已經(jīng)認(rèn)識(shí)到現(xiàn)狀并采取措施，我們最終(intime)會(huì)成功的。________________________________________________________________________5．水是生命存在的最根本物質(zhì)。____________________________________________6．這一系列反響使得生命在地球上開(kāi)展成為可能(makeitpossi