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WASHINGTON(AP)——Humanbeingsmayhavehadabrushwithextin...
问题详情: WASHINGTON(AP)——Humanbeingsmayhavehadabrushwithextinction70,000yearsago,allextensivegenetic(基因的)studysuggests. ThehumanpopulationatthattimewasreducedtosmallseparategroupsinAfrica,a...