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。
2017届高考英语一轮复习课时作业15:Unit 3《Science and nature》(牛津译林版必修5湖南专用)
2017年高考英语一轮复习课时作业6:Unit 6《Design》(北师大版必修2通用版)
2017届高考英语一轮复习课时作业详答4:Unit 4《Earthquakes》(新人教版必修1通用)
2017年高考英语一轮复习课时作业7:Unit 7《The Sea》(北师大版必修3通用版)
2017年高考英语一轮复习课时作业详答30:Module 6《Animals in Danger》(外研版选修5通用)
2017届高考英语一轮复习课时作业详答5:Unit 5《Nelson Mandela—a modern hero》(新人教版必修1通用)
2017届高考英语一轮复习课时作业27:Unit 4《Films and film events》(牛津译林版选修8湖南专用)
2017届高考英语一轮复习课时作业6:Unit 3《Amazing people》(牛津译林版必修2湖南专用)
2017届高考英语一轮复习课时作业23:Unit 4《Public transport》(牛津译林版选修7湖南专用)
2017年高考英语一轮复习课时作业详答32:Module 2《Fantasy Literature》(外研版选修6通用)
2017届高考英语一轮复习课时作业17:Unit 2《What is happiness to you》(牛津译林版选修6湖南专用)
2017年高考英语一轮复习课时作业3:Unit 3《Celebration》(北师大版必修1通用版)
2017届高考英语一轮复习课时作业11:Unit 2《Sports events》(牛津译林版必修4湖南专用)
2017届高考英语一轮复习课时作业22:Unit 3《The world online》(牛津译林版选修7湖南专用)
2017年高考英语一轮复习课时作业详答25:Module 1《British and American English》(外研版必修5通用)
2017届高考英语一轮复习课时作业25:Unit 2《The universal language》(牛津译林版选修8湖南专用)
2017届高考英语一轮复习课时作业详答1:Unit 1《Friendship》(新人教版必修1通用)
2017年高考英语一轮复习课时作业详答33:Module 3《Interpersonal Relationships—Friendship》(外研版选修6通用)
2017届高考英语一轮复习课时作业7:Unit 1《The world of our senses》(牛津译林版必修3湖南专用)
2017届高考英语一轮复习课时作业详答3:Unit 3《Travel journal》(新人教版必修1通用)
2017年高考英语一轮复习课时作业详答27:Module 3《Adventure in Literature and the Cinema》(外研版选修5通用)
2017届高考英语一轮复习课时作业24:Unit 4《Making the news》(新人教版必修5陕西专用)
2017年高考英语一轮复习课时作业6:Unit 6《Design》(北师大版必修2通用版)
2017届高考英语一轮复习课时作业23:Unit 3《Life in the future》(新人教版必修5陕西专用)
2017年高考英语一轮复习课时作业8:Unit 8《Adventure》(北师大版必修3通用版)
2017年高考英语一轮复习课时作业详答31:Module 1《Small Talk》(外研版选修6通用)
2017届高考英语一轮复习课时作业8:Unit 2《Language》(牛津译林版必修3湖南专用)
2017年高考英语一轮复习课时作业详答28:Module 4《Carnival》(外研版选修5通用)
2017届高考英语一轮复习课时作业4:Unit 1《Tales of the unexplained》(牛津译林版必修2湖南专用)
2017届高考英语一轮复习课时作业18:Unit 3《Understanding each other》(牛津译林版选修6湖南专用)
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