Recent discoveries in New World archaeology along with new scientific methods for analyzing data have led to new ideas regarding the origin of the first peoples of the Americas and their time of arrival.
The traditional theory held that the first Americans crossed the land bridge from Siberia to Alaska around 11,500 years ago and followed an ice-free corridor between two large Canadian ice sheets to reach unglaciated lands to the south. These first inhabitants, whose archaeological sites are scattered across North and South America, were called the Clovis people, named after the town in New Mexico where their fluted spear points used for hunting mammoth were first found in 1932.
旧观点:11500年前越冰南下,这些第一批定居者散布在南北美洲,叫做Clovis人。
新观点:有更早的12500年前,在智利的MV。
外研版(三起)英语三下 全册备课
[2013春]外研版(一起)一下《Unit 1 Where’s the bird》word教案
外研版(三起)英语三下 全册教案备课
外研版(三起)英语三下 M1 作业设计
[2013秋]外研版(三起)三上《Module 8 Friends》mp3课文听力
外研版(三起)英语三下 复习资料
外研版英语三起三上2012版M10
外研版英语三起三上2012版M3
外研版英语三起三上2012版M2-U1-mp3格式课文朗读
外研版英语三起三上2012版M2-U2-mp3格式课文朗读
[2013春]外研版(一起)一下《Unit 2 The toy car is under the bed》word教案
[2013春]外研版(一起)一下《Unit 1 He’s a doctor》word教案
外研版英语三起三上2012版M1
外研版(三起)英语四下《Shes a nice teacher》教学设计
[2013春]外研版(一起)一下《Unit 2 They’re little and cute》word教案
[2013春]外研版(一起)一下《Unit 1 Where’s the orange cat》word教案
外研版(三起)英语四下《moudle6 The girl is good》教学设计
[2013秋]外研版(三起)三上《Module 2 Introductions》mp3课文听力
外研版(三起)英语三下 全册教案
外研版英语三起三上2012版M10-U1-mp3格式课文朗读
[2013春]外研版(一起)一下《Unit 2 She’s a nurse》word教案
外研版英语三起三上2012版M2
2014秋外研版(三起)三上Module 6《Unit 1 Happy birthday》ppt课件3
外研版英语三起三上2012版M10-U2-mp3格式课文朗读
外研版英语三起三上2012版M3-U2-mp3格式课文朗读
外研版(三起)英语三下 九模块短语和句型
外研版(三起)英语三下 教学计划
外研版(三起)英语三下 短语和句型
外研版(三起)英语四下《MODULE3 unit1》教学设计
[2013秋]外研版(三起)三上《Module 10 Body》mp3课文听力
| 不限 |
| 英语教案 |
| 英语课件 |
| 英语试题 |
| 不限 |
| 不限 |
| 上册 |
| 下册 |
| 不限 |