分词做后置定语.docx

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1、ThiswouldhavecreatedabarrieroficeextendingfromtheAlaskaPeninsula,throughtheGulfofAlaskaandsouthwardalongtheNorthwestCoastofnorthAmericatowhatistodaythestateofWashington.Hetheorizedthatwiththeuseofwatercraft,peoplegraduallycolonizedunglaciatedrefugesandareasalongthecontinentalshelfexposedbythelowe

2、rsealevel.Thefirstwatercrafttheoryaboutthismigrationwasthataround11,000-12,000yearsagotherewasanice-freecorridorstretchingfromeasternBeringiatotheareasofNorthAmericasouthofthegreatnorthernglaciers.Butbeliefinthisice-freecorridorbegantocrumblewhenpaleoecologistGlenMacDonalddemonstratedthatsomeofth

3、emostimportantradiocarbondatesusedtosupporttheexistenceofanice-freecorridorwereincorrect.Thecoastalhypothesishasgainedincreasingsupportinrecentyearsbecausetheremainsoflargelandanimals,suchascaribouandbrownbears,havebeenfoundinsoutheasternAlaskadatingbetween10,000and12,500yearsago.Thecoastalhypoth

4、esissuggestsaneconomybasedonmarinemammalhunting,saltwaterfishing,shellfishgathering,andtheuseofwatercraft.Inaddition,therewasanimportantgroupofsculpturesmadeforreligioususe,themajorityofwhichwereproducedinearthenware.WhitewaresproducedinHebeiandHenanprovincesfromtheseventhtothetenthcenturiesevolv

5、edintothehighlyprizedporcelainsoftheSongdynasty(AD.960-1279),longregardedasoneofthehighpointsinthehistoryofChina'sceramicindustry.Oneofthemostfar-reachingexamplesistheimpactofthefineninth-centuryAD.ChineseporcelainwaresimportedintotheArabworld.CobaltoresfoundinChinahaveahighmanganesecontent,which

6、producesamoremutedblue-graycolor.