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28eghellsand found acros Africa has revealedacrkgists say."People made them to communicate symbolic messages,the way that today we mightwear a wedding ring,to indicate something about social status,wealth or position insocsaid Jennifer Miller,a postdoctoral researcher in the Department of Archaeology at the MaxPlanck Institute for the Science of Human History,in Jena,Germany.They studied 1,516 beads (1,238 of which were described for the first time)that origina-ted from31 different sites across southern and eastern Africa and spanned (the last50,000 years.Comparing the different characteristics of the beads-the size and thickness,they found that between 33,000 and 50,000 years ago,people at sites across southern and线eastern Africaspanning a distance of more than 3,000 kilometers (about 1,864 miles)-wereusing almost identical beads."We know that genetically these groups had some sort of contact,but there so far hasbeen no cultural evidence,"said Miller,who was an author of the study,which was published焙on Monday in the journal Nature.The oldest beads come from East Africa,the study found,and likely spread south across the continent from there.The authors described it as the oldestsocial network ever identified and the furthest Old Stone Age "stylistic connection"ever docu-mented.While it's possible the beads could have been directly exchanged in some way,Millerthought more likely it was the knowledge of how to make them that was exchanged."Possibly屈people would have seen this new thing that people were wearing or making and thought,Oh,that's so cool.'And then copied it,"Miller said."And so in that way,rather than obtaining吟these beads directly,it might have been more of copying the cool new thing.".Whydid poe i Arica make tiny beads 000 years雪A.To use them as presents.B.To show their social status.C.To exchange things with others.D.To tell others they were married.29.What did the resarher find about the beads between and5000 r.They were almost the same.全国100所名校最新高考冲刺卷第6页（共12页）【22·高考样卷·英语（一）一Y灯