2014
高考英语阅读理解基础精品二轮训练题（6）及答案阅读理解 nearly all of today’s native americans in north, central and south america can trace their ancestry to just six women whose descendants（后裔）immigrated around 20,000 years ago, a dna study suggests． the finding does not mean that only these six women gave rise to migrants who crossed into north america from asia in the earli
