英语必修1 unit 4

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1、Ausualnaturaldisaster——earthquake地球内部缓慢积累的能量突然释放引起的地球表层的震动叫地震。由于地球不断运动和变化，地壳的不同部位受到挤压、拉伸等力的作用，逐渐积累了能量，在某些脆弱的部位，岩层就容易突然破裂，引起断裂、错动，于是就引发了地震。Howdoesanearthquakestart?Whatmakesanearthquakehappen?Therockoftheearth‘scrust（地壳）mayhaveafault,akindofbreakinthesurface.Theblockswhichmakeuptheearthmove,a

2、ndsometimesthismaycausethesidesofthefaulttomoveupanddownorlengthwaysagainsteachother.Whenonepieceofrockstartstorubonanotherwithgreatforce,alotofenergyisused.Thisenergyischangedintovibrations（震动）anditisthesevibrationsthatwefeelasanearthquake.Thevibrationscantravelthousandsofkilometersandsoane

3、arthquakeinTurkeymaybefeltinGreece.Whattododuringanearthquake?AtschoolAssoonastheearthquakestarts,studentsshouldgetunderthedesksimmediatelyandwaituntiltheteachertellsthemitissafetocomeout.Theteachershould,atthesametime,goimmediatelytotheteacher’sdesk,getunderneathitandstaytheretillthedangeri

4、sover.Studentsmustnotarguewiththeteacherorquestioninstructions.Assoonasthetremors（震动）stop,allstudentsshouldwalktowardtheexitandgostraighttotheschoolplaygroundoranyopenspacesuchasasquareorapark.Theymustwaitthereuntiltheteachertellsthemitissafetogo.AthomeIfyouareathomewhentheearthquakeoccurs,g

5、etimmediatelyunderthetableinthelivingroomorkitchen.Choosethebiggestandstrongesttableyoucanfind.Don‘tgooutontothebalcony（阳台）.Oncethetremorshavestopped,youcancomeoutfromunderthetable,butyoumustleavethebuildingstraightaway.Youshouldwalktowardsthestairsandshouldnotusethelift—theremaybeapowercuta

6、saresultoftheearthquakeandyoucouldfindyourselftrappedinsidetheliftforhours.SectionⅠWarmingUpandReadingⅠ.ReadthetextcarefullyandthendecidewhetherthefollowingstatementsareTrueorFalse.1.Peoplecouldonlyhearthesoundoftheplanewhentheplanewasveryhighintheair.()2.Asmellygascameoutofthecracksinthewel

7、l.()3.TheearthquakeinTangshanhappenedlateatnight.()4.Whentheearthquakehappened,fewpeopleoutsideTangshancouldfeelit.()5.Intheearthquakealmostallthebuildingsfelldown.()6.Afterthequake,thearmyorganizedrescueteamstohelpthepeopletrappedintheruins.()【答案】