unit 7 natural disasters

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1、Unit7NaturalDisastersI.WarmingUpForthissection,youarerequiredtowatchavideothreetimes.Eachtimeyoumustcompleteanexercisewithadifferentfocus.Beforewatching,makeyourselffamiliarwiththefollowingwordsandexpressions,whichwillmakeiteasyforyoutounderstandthevide

2、o.I.WarmingUpWordsandExpressionsseismographn.aninstrumentforautomaticallydetectingandrecordinganearthquake地震仪mythologyn.abodyorcollectionofmythsbelongingtoapeopleandaddressingtheirorigin,history,deities,ancestors,andheroes神话catfishn.鲶鱼tectonica.地壳构造的man

3、tlen.thelayeroftheearthbetweenthecrustandthecore地幔collidev.cometogetherwithviolent,directimpact碰撞frictionn.therubbingofoneobjectorsurfaceagainstanother摩擦faultn.断层tremorn.ashakingorvibratingmovement,asoftheearth大地的震动seismicdetectorn.地震探测器atthemercyof任……处

4、置；无能为力I.WarmingUp1.1Watchthevideoanddecidewhetherthefollowingstatementsaretrueorfalse.()(1)Aquakecouldbehappeninghundredsorthousandsmilesaway,evenontheothersideoftheplanet.()(2)Theearthcrustisdividedintobroadpiecescalledtectonicplatesfloatingbelowtheliq

5、uidmantlehundredmilesabove.()(3)TheearlyJapaneseinventedthegiantcatfishtopredicttheearthquake.()(4)Moderntechnologyhasgivenusanewmethodofpreparingforearthquakes-theearlywarningsystem.()(5)Wecanpreventearthquakes;weknowthey’remostlikelytooccur,sowecanpre

6、dictwhenandwheretheywillstrike.I.WarmingUp1.1Keys:1.T2.F3.F4.T5.FI.WarmingUp1.2Watchthevideoforthesecondandthirdtimeandthenanswerthefollowingquestions.(1)WhyaretheChinesethoughttobeuniqueaccordingtothenarrator?(2)Wheredoesanearthquakeusuallyhappen?(3)At

7、whattimewasChinesefirstinventedtheseismicdetector?(4)Whenseismicdetectorsentoutawarning,could20secondsbelongenoughtosavesomepeople?(5)Areearthquakesalwayswithus?I.WarmingUp1.2Keys:1.AChinesemathematicianbuiltadevicewithmetalballsindragon’smouth.Apendulu

8、mintheinstrumentmovedwhenitregisteredaquakeandtheballsfelloutintothewaitingfrog’smouthbelow.2.95%ofallearthquakeshappenalongtheboundariesbetweentectonicplates.3.Almost2000yearsago.4.Yes.5.Yes.BackgroundInformationaboutEarthquakeW