og11-cr-60请教

woliger

请教：如果人们是less than 20000 years到达 北美，那末如何可能有比南美32000 years 还早的shelters，还是我那里没读懂？谢谢

hughlv

lz，拜托把题目上下文给完整。不要假设大家能够热情到为了回答你的问题去买本OG11。

woliger

不好意思。og11-cr（紫皮）-60
Most archaeologists have held that people first reached the America less than 20,000 years ago by crossing a land bridge into North America.But recent discoveries of human shelters in South America dating from 32,000 years ago have led researchers to speculate that people arrived in South America first,after voyaging across thePacific,and then spread northward.

Which of following,if it were discovered,would be pertinent evidence against the speculation above?

(B) Some North American sites of human habitation predate any sites found in South America

正确答案是B，我也知道b无疑是最好，只是：如果人们是less than 20000 years到达 北美，那末北美如何可能有比南美32000 years 还早的shelters，还是我那里没读懂？谢谢