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WhenpeoplefirstwalkedacrosstheBeringLandBridgethousand...
问题详情: WhenpeoplefirstwalkedacrosstheBeringLandBridgethousandsofyearsago,dogswerebytheirsides,accordingtoastudypublishedinthejournalScience. RobertWayneoftheUniversityofCalifornia,LosAngeles,and...