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1、Unit4Earthquakes2019-2020年高中英语Unit4Backgroundinformation教案新课标人教版必修1I.ZhangHengZhangHeng(张衡)(78AD—139AD)wasanastronomer,mathematician,artistandliteraryscholar（文学学者）intheEasternHanDynastyofChina.Bornintoday’sNangyangCounty,Henan,hewasagoodwriteratage12.Attheageof16,helefthometopurs
2、ue(从事)hisstudyingthecapitalcity.Hespentatleast10yearsofhisyouthinliterarystudiesandwriting.Hepublishedseveralwell-recognizedliterarywritings.Heswitchedto(转向)astronomyafterage30.Intheyear123hecorrectedthecalendartobringitintolinewiththeseasons.In132ZhangHenginventedthefirstseismog
3、raph(地震仪)formeasuringearthquakes.Hisdevicewasintheshapeofacylinder(圆柱体)witheightdragonheadsaroundthetop,eachwithaballinitsmouth.Aroundthebottomwereeightfrogs,eachdirectlyunderadragonhead.Whenanearthquakeoccurred,aballfelloutofthedragon’smouthintoafrog’smouth,makinganoise.Healsoin
4、ventedtheodometer(里程表)ZhangHengwasthefirstpersoninChinatoconstructarotatingcelestialglobe.Inoneofhispublicationshealsoproposedπ=730/232(orabout3.1466).II.EarthquakeSurvivalTipsWouldyouknowwhattododuringareallybigearthquake?Expertshavelookedintomattercarefully.Itmaybeworthyouwhile
5、tolookoverthefollowingtipstheyhaveforus.Ifthegroundbeginsshakingwhileyouaredriving,pulloverandstayinyourcar.Ifyouareinabuilding,trytogetnearastrongwall.Thecorneroftheroomorthespaceunderabigdoorwayisthesafest.Assoonasthequakeisover,checkthegaspipeinthebuilding.Gasfiresoftenresultf
6、romearthquakes.Thesetipsmayprovetobelifesavers.Weshould,therefore,keeptheminmind.Remembertoalwayshopeforthebestbutpreparefortheworst.EscapeintheSchoollIfithasanearthquakewhenhavingclasses,thestudentsshouldlistentotheteacher’sinstruction,protecttheirheadsandhideunderthedesks.lIfit
7、hasanearthquakewhenthestudentsareinthesportsground,theycancrouchonthespotandprotecttheirheadswithhands.Besuretokeepawaywithhighbuildinganddangerousobjects.lDon’tgobacktotheclassroom.lRetreatinorderaftertheearthquake.EscapeinPublicPlacesListentothemandofthesiteworkers.Don’tbescare
8、danddon’trushtowardstheexits.Trytoavoidc
