高二人教新课标版选修八Unit5MeetingyourancestorsUsingLanguageTheworkonearlypeopledependsonthedatesgiventothebonesthatarefound.Ifthedatesarewrong,allthedataaboutearlypeoplemayalsobewrong.SoZhouHepingisveryinterestedtofindouthowarchaeologistsmakesurethattheirdatesareaccurate.ListeninganddiscussingyogurtpotsorangeskinwastepaperusedenvelopesThewastepaperbasket1ListentoPart1ofthetapeandtrytounderstand“thewastepaperbasket”diagramontherightandfillinthelayers.Itusesradioactivitytomeasuretheamountof_______inlivingthings.The_______inadeadbody__________ata______rate.Weknowhowlongthattakes,sowecanmeasuretheamountof_______and_________howoldaboneis.carboncarbondisappearsfixedcarbonworkout2ListentoPart2andcompletethepassagebelow.3Lookatthisarchaeologicaldrawingofasectionshowingbuildingsatdifferenttimesandworkouttheorderinwhichtheywerebuilt.Writeyouranswerbelowandcheckwithyourpartner.Remembertogiveareasonforyouranswerinyourdiscussion.TheoldestbuildingisBbecauseithasnolayersunderneathit.ThesecondoldestbuildingisCbecauseithasnolayerunderneathit.ThatlayeristheremainsofthebuildinginB.ThemostrecentbuildingisbuildingA.Ithastwolayersunderneath.TheyaretheremainsofbuildingsBandC.ZH:Howcanyoutellhowoldbonesarewhenyoufindthem?LISTENINGTEXT(P42)DATINGMETHODSZhouHepinghascometoaskthearchaeologist,RichardLeakey,howhedatestheboneshefinds.Part1RL:Therearetwomainways:thefirstuseslayersinthegroundandthesecondusestheradiocarbondating.ZH:Howdoesthelayermethodwork?RL:Well,Lookatthediagraminyourbook.Thinkofyourwastepaperbasket.Whenyoucameintoworkyouthrewtheorangeskinintoit.That’slayernumber1.Latersomebodythrewyogurtpotsintoit.That’slayernumber2.ZH:Ohyes,andthenIthrewsomepaperintoit.Sothat’slayernumber3.RL:Yes,andfinallysomeonethrewsomeusedenvelopes.Sohowmanylayersarethereinthiswastepaperbasket?ZH:TherearefourRL:Good.Nowwhichlayeristhefirstandthereforetheoldest?ZH:Theorangeskin.RL:Andwhichisthelastandthereforethemostrecent?ZH:Ofcourse-theusedenvelopes.Iseehowitworksnow.Buthowdoesithelp?RL:Well,layersofsoilareproducedatdifferenttimeslikethelayersinyourwastepaperbasket.Eachtimepeoplelivesomewhere,theymakealayerinthesoil.Iftheylivethereforalongtime,theymakealotoflayers.Eachlayerhasadifferentcolourandtexturewhichweusetofindouthowolditis.ZH:Howsplendid!ZH:Nowwhataboutradiocarbondating?RL:Thisismorescientific.Itusestheradioactivitytomeasuretheamountofcarboninlivingthings.Thecarboninadeadbodydisappearsatafixedrate.Weknowhowlongthattakes,sowecanmeasuretheamountPart2ofcarbonandworkouthowoldaboneis.ZH:That'sveryclever.Isitaccuratetoo?RL:Therearesomeproblemswithveryoldbones,soyouarealwaysgiventwodates.ZH:Howdoesthatwork?RL:Well,thedateforabonemaybebetween9,900yearsand10,100yearsold.ZH:Isee!HowoldarethebonesfromtheZhoukoudianCaves?RL:Theyarebetween250,000and400,000yearsold.ZH:Perhapswecouldvisitthesitetogethersometime?RL:Ofcourse.Wheneveryoulike!THEFEAST:18,000BC北京人生活想象图北京人北京猿人的化石首次发现于1927年1929年12月2日发现第一个完整的头盖骨到1937年已发现的北京人的头盖骨共5个。1941年12月太平洋战争爆发后,在几个美国人手里弄得下落不明。1966年又发现一个残破的头盖骨。总共发现了属于40多个个体的北京人化石。时间距今约七十万年至二十万年。●能够制造和使用劳动工具●能使用天然火●摆脱了杂交的婚姻形态●生活艰苦,寿命比较短暂北京猿人的特征北京人使用过的石器北京人石器制作法山顶洞人▲距今时间:18000年前▲地点:北京...
