阅读段落
Recent work on the problem of when people first entered the Americas is an example of the value of these new techniques. North-east Asia and Siberia have long been accepted as the launching ground for the first human colonisers of the New World. But was there one major wave of migration across the Bering Strait into the Americas, or several? And when did this event, or events, take place? In recent years, new clues have come from research into genetics, including the distribution of genetic markers in modern Native Americans.
段落大意
本段介绍了人们能够利用基因研究人类迁移美洲大陆的几个疑问。
阅读笔记
Recent work show value of these new techniques
Major wave of migration across the Bering Strait?
When took place?
Research into genetics →new clues
逻辑关系
并列(逻辑连接词: AND)
But was there one major wave of migration across the Bering Strait into the Americas, or several?
When did this event, or events, take place?
责任编辑：admin
① 凡本网注明“稿件来源：北京新东方学校”的所有文字、图片和音视频稿件，版权均属北京市海淀区私立新东方学校所有，转载请注明“来源：北京新东方学校”。
② 本网未注明“稿件来源：北京新东方学校”的文/图等稿件均为转载稿，本网转载仅基于传递更多信息之目的，并不意味着赞同转载稿的观点或证实其内容的真实性。如其他媒体、网站或个人从本网下载使用，需自负版权等法律责任。如擅自篡改为“稿件来源：北京新东方学校”，本网将依法追究法律责任。
③ 如有本网转载稿涉及版权等问题，请作者见稿后速来电与北京新东方网联系，电话：010-62578989。
