１０月７号二战ＧＭＡＴ．有个逻辑题不太明白！ＯＧ－３９，讨论上没有．．希望ＮＮ指点．

katrinaxy520

Most archaeologists have held that people first reached the Americas less than 20,000 years ago by crossing a land bridge into North America.

不知道是不是大脑短路了，划线部分想不通什么意思．．．．这是ＯＧ１０上的３９题，讨论帖上没有．

katrinaxy520

怎么每人理我呀！自己顶一下．难道是这问题太弱智了．．．

katrinaxy520

懂了．脑子没转过来．谢谢啊！