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1、UsingLanguageDATINGMETHODSZhouHeping(ZH)hascometoaskthearchaeologist,RichardLeakey(RL),howhedatestheboneshefinds.ListentoPart1.Listenagainandfillintheblanks.ZH:Howcanyoutellhowoldbonesarewhenyoufindthem?RL:Therearetwomainways:thefirstusesthelayersinthegroundandthesecondusesradiocarbondatin
2、g.ZH:Isee.Howdoesthelayermethodwork?RL:Well,lookatthediagraminyourbook.Thinkofawastepaperbasket.Whenyoucameintowork,youateanorangeandthrewtheorangeskinintoit.That’slayernumber1.Latersomebodythrewsomeyogurtpotsintoit.That’slayernumber2.ZH:Ohyes,andthenIthrewsomepaperintoit.Sothat’slayernumb
3、er3.RL:Yes,andfinallysomeonethrewawaysomeusedenvelopes.Sohowmanylayersarethereinthiswastepaperbasket?ZH:Therearefour.RL:Whichlayeristhefirstandthereforetheoldest?ZH:Theorangeskin.RL:Andwhichisthelastandthereforethemostrecent?ZH:Ofcourse–theusedenvelopes.Iseehowitworksnow.Buthowdoesithelp?R
4、L:Well,layersofsoilareproducedatdifferenttimeslikethelayersinyourwastepaperbasket.Eachtimepeoplelivesomewhere,theymakealayerinthesoil.Iftheylivethereforalongtime,theymakealotoflayers.Eachlayerhasadifferentcolourandtexturewhichweusetofindouthowolditis.ZH:Howsplendid!ListentoPart2.Listenagai
5、nandfillintheblanks.ZH:Nowwhataboutradiocarbondating?RL:Thisismorescientific.Itusesradioactivitytomeasuretheamountofcarboninlivingthings.Thecarboninadeadbodydisappearsatafixedrate.Weknowhowlongthattakes,sowecanmeasuretheamountofcarbonandworkouthowoldaboneis.ZH:That'sveryclever.Isitaccurate
6、too?RL:Therearesomeproblemswithveryoldbones,soyouarealwaysgiventwodates.ZH:Howdoesthatwork?RL:Well,thedateforabonemaybebetween9,900yearsand10,100yearsold.ZH:Isee!HowoldarethebonesintheZhoukoudiancaves?RL:Theyarebetween250,000and400,000yearsold.ZH:Perhapswecouldvisitthesitetogethersometime?
7、RL:Ofcourse.Wheneveryoulike!Workbook-ListeningMORENEWSABOUTTHETERRACOTTAWARRIORS3AmandaPeters(AP)wantstofindoutabouthowtopreservetheterracottawarriorsfromherChinesefriend,ZhouLei(ZL),anarchaeologist.Listenagainandfillintheblanks.AP:Wheredidyougoforyourholiday,
