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时间:2020-02-29
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1、Unit4Astronomy:thescienceofthestarsNowwe’regoingtolistentoatalkaboutthetheoriesofgravity.Listencarefullyandtrytogetthemainideaofit.ListeningAThetextisabouthowthreescientistswantedtofindoutaboutthebeginningoftheuniverse.BThetextisabouthowtheideaofgravityhasdevelopedoveralongperiodofti
2、me.CThetextisabouttheimportanceofthreescientistsandtheirwork.Choosethebestsummary.SummaryBiscorrectbecauseitgivesaclearideaofwhatthelisteningpassageisabout.SummaryAisnottrue.Thethreescientistswantedtoexplainhowtheuniverseworkedandnothowitbegan.SummaryCistoogeneralanddoesnotgiveenough
3、detailaboutwhatthelisteningpassageisabout.Listentothetapeagainandfillinthechart.IsaacNewtonAlbertEinsteinStephenHawkingIdeaLargebodieshaveaforcewhichpullsthingstowardsthem.Inspacelargeobjectsmakespaceandtimebend;thelargertheobject,thefurtherspaceandtimebend.Blackholeshaveaverylargema
4、ssandpullthingstowardsthem.IsaacNewtonAlbertEinsteinStephenHawkingDevelopmentThebiggertheobjectthestrongerthegravity.Timegoesslowerinverystronggravity.Ifyougoovertheedge,youcannotgetout;butifyoudonot,youmaybeabletoescape.Readthepassagecarefullyandthendescribethethreewaysinwhichgravit
5、ychangedforLiYanpingandhowhisweightchanged.1.Thepullofgravitybecameverystronghelefttheearth’satmosphere.Hisweightisnormal.2.Itdisappearedwhenhewasinspace.Heisweightless.3.Itwasverylightwhenhewasonthemoon.Heweighslessthanonearth.HomeworkCollectpassagesaboutgravity.Prepareforspeaking.
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