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1、【课本习题】人教版必修三Unit4作者：儒风无棣时间：2012年12月28日00:01Unit4课内练习答案.(P27Ex.1.)1.Para.1:AwidelyacceptedtheoryabouttheformationoftheuniversePara.2:TheformationoftheearthPara.3:TheimportanceofwaterforlifePara.4:ThedevelopmentofplantsandanimalsontheearthPara.5:Thearrivalofhumansandt
2、heirimpactontheearth2.P27Ex.2.1073849615212113.P27Ex.3.1.Becausethewaterremainedontheearth.2.Becauseplantsprovideoxygenforanimalstobreathe.3.Becausedinosaursdiedoutlongbeforehumanbeingdevelopedontheearth.4.ThenameisPluto.Scientistsnowthinkitistoosmalltobecalledaplan
3、et.5.Humanbeingscausedglobalwarming.4.P27Ex.4.Discoursemarkers:however,afterthat,next,later,finally,thus,asaresultofthisSentenceconnectorsorconjunctions:and,but,because5.P28Ex.16.P28Ex.21C2A3C4B7.P28Ex.3fundamental,astronomy,gavebirthto,existed,Asaresult,atoms,preve
4、nts……from,puzzle8.P28Ex.4Emotionalwords:violent,angry,rude,shocked,excited,crazyCalmwords:patient,gentle,relaxing,kind,easy-going,calm9.P29Ex.21.Whathasnotyetbeenprovedishisdiscovery.2.Whethertheotherastronomersaccepthisideasremainsaquestion.3.Howlifefirstappearedon
5、earthisstillamysterytoscientists.4.Whytheearthisbecomingwarmerisanimportanttopicforresearch.5.ItamazedeverybodythatStephenHawkingat65experiencedzerogravityduringaflight.6.ItisasurprisethatPlutoisnolongerconsideredaplanetinoursolarsystem.10.P29Ex.31,4,3,5,2,611.P30Ex
6、.2SummaryBiscorrectbecauseitgivesaclearideaofwhatthelisteningpassageisabout.SummaryAisnottrue.Thethreescientistswantedtoexplainhowtheuniverseworkedandhowitbegan.SummaryCistoogeneralanddoesnotgiveenoughdetailaboutwhatthelisteningpassageisabout.12.P30Ex.313.Unit4Workb
7、ook练习答案(P62Ex.1)1.Severalcountriesareinvolvedinspacetravelwithsatellitesandspaceshipsthathavevisitedoneoftheplanets(Mars:USA)andthemoon(USA).Onlyonecountryhassentastronautstothemoonandreturnedthemsafely—theUSA.2.Threecountrieshavesentastronautsintospace:Russia,USAan
8、dChina.3.TheRussianastronautshavetravelledroundtheearthlivedinaspacestationandlandedonthemoon.TheChineseastronautshavetravelledroundtheear
