教材试题 unit 5 listening and speaking

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1、Unit5MeetingyourancestorsListeningandspeakingTheworkonearlypeopledependsonthedatesthataregiventothebonesfound.Ifthedatesarewrong,allthedataaboutearlypeoplemayalsobewrong.SoZhouHepingisveryinterestedtofindouthowarchaeologistsmakesurethattheirdatesareaccurate.1Listentothetapeandfillt

2、helayersinthe“wastepaperbasket”diagramontheright.2Listentothetapeagain.Payattentiontothemethodsarchaeologistsusetodatebonesandhowthosemethodswork,thenfillinthechartbelow.MethodHowitworks1LayersinthegroundEachlayerlooksdifferentastheyareuncovered,soyoucantellwhereonelayerstartsandan

3、otherfinishes.Inthewastepaperbasket,themostrecentlayeris_____,anolderlayerisbelowthatandthe___layeris_______.2RadiocarbondatingAlllivingthingshave_____intheirbodies.Whentheydie,thecarbon_____ata_____rate.Themethodmeasures_____ofcarboninbonesorplantsusingradioactivityandcan_____howo

4、ldtheremainsare.3Lookatthisarchaeologicaldrawingofasectionshowingbuildingsatdifferenttimesandworkouttheirchronologicalorder.Writeyouranswerbelow,thencheckwithapartner.Remembertogivereasonsforyouranswerinyourdiscussion.1_________________________2_________________________3___________

5、______________LISTENINGTEXTDATINGMETHODSZhouHepinghascometoaskthearchaeologist,RichardLeakey,howhedatestheboneshefinds.ZH:Howcanyoutellhowoldthebonesarewhenyoufindthem?RL:Therearetwomainways:thefirstuseslayersinthegroundandthesecondusestheradiocarbondating.ZH:Howdoesthelayermethodw

6、ork?RL:Well,manylayersofsoilwereproducedatdifferenttimes.Eachtimepeoplebuildhousesandlivesomewhere,theymakeanoccupationlayer.Eachhasadifferentcolourandtexture.ZH:Howdoesthathelp?RL:Lookatthediagraminyourbook.Thinkofyourwastepaperbasket.Whenyoucameintoworkyouthrewtheorangeskinintoit

7、.Latersomeonethrewtheiremptyyogurtpotsintoit.Thensomewastepaperwasadded.Finallysomeonethrewawaysomeusedenvelopes.Howmanylayersarethere?ZH:Therearefourlayers.RL:Good.Nowwhichlayeristhelatest?ZH:Now,letmethink!Yes,it’llbetheoneonthetop,whichistheusedenvelopes.RL:Andwhere’stheoldestla

8、yer?ZH:Atthebottom.RL:Well