GRE阅读练习达尔文理论溯源美国殖民地历史

GRE阅读练习：达尔文理论溯源美国殖民地历史GRE阅读训练：GRE阅读练习：达尔文理论溯源美国殖民地历史 GRE考试精品课程指导 Thefirst migrants to the ne

1 11 第页共页 Word文档下载后（可任意编辑） GRE 阅读练习：达尔文理论溯源美国殖民地历史 GREGRE 阅读训练：阅读练习：达尔文理论溯源美国殖民地历史 GRE 考试精品课程指导 Thefirst migrants to the new world had to wait 8000 years to be admitted. 8000 新大陆的第一批移民在年后才被公认。 HOWAmerica was originally colonised is atopic of perennial interest at the AAAS.Until recently, the earliest uncontested archaeological evidence of peopleliving in the New World came from Swan Point, in Alaska. This dates back 14,400years. Linguists, however, maintain that the diversity of native languages inthe Americas could not have arisen so quickly. Conventional models oflinguistic evolution assume tongues separate in the way populations oforganisms do—so that the flow of vowels, words and grammatical structuresbetween groups must cease before new languages can emerge, just as acessationof gene