首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Why are "Clovis people" believed to first enter North America?
Why are "Clovis people" believed to first enter North America?
admin
2009-03-16
51
问题
Why are "Clovis people" believed to first enter North America?
In the 1930s, archaeologists discovered spear points in the New Mexico town of Clovis, dated from around 13,000 years ago. The individuals who made them have since become known as the "Clovis people" and are believed by many to have been the first people to enter North America.
The "Clovis first" theory proposes that around 14,000 years ago people traveled across a land bridge that existed between Siberia and Alaska. Once in North America, their journey took them through a corridor that opened up between the ice sheets in Western Canada making them the first to be able to enter the interlor of the continent. It’s an elegant and almost biblical explanation; but more recent fossil finds question the theory. Some researchers believe the first people entered North America much earlier—perhaps as long as 20,000-30,000 years ago.
In more recent years, the Pacific coast has been seen as an alternative route of entry-possibly at an earlier date than the Clovis. There is little direct evidence to support this, but fossil evidence from the islands of south-east Alaska tells us that this region, or part of it, was free of ice and may have been a refuge for animals throughout the ice age.
If animals such as bears and foxes lived here then why not people? Fossilized human remains have been found on Alaska’s Prince of Wales Island and much further south on the Channel Islands off California. These are thought to be as old as some of the Clovis .finds and it may only be a matter of time before older remains are discovered.
If people did travel down the coasts between islands, they must have used boats. Although the coastal route still lacks a lot of hard evidence, the relatively recent discovery of a stone tool off the coast of British Columbia has added support to the idea.
选项
A、30,000years ago.
B、13,000 years ago.
C、14,000 years ago.
D、20,000 years ago.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/GtPd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Whatdoesthespeakersuggestthatthestudentsshoulddoduringtheterm?
Somemodemcitiesareusuallyfamousforpeoplewholiveaverylongtime.
Somemodemcitiesareusuallyfamousforpeoplewholiveaverylongtime.
Somemodemcitiesareusuallyfamousforpeoplewholiveaverylongtime.
Somepeoplelearnbestwhenaclassroomlessonispresentedinanentertaining,enjoyableway.Otherpeoplelearnbestwhenale
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【31】______tothe
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【31】______tothe
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【31】______tothe
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【31】______tothe
Consumersandproducersobviouslymakedecisionsthatmoldtheeconomy,butthereisathirdmajorelementtoconsider—therol
随机试题
计算机辅助软件工程
孕妇,32岁,G3P0,因孕过期入院待产。检查:血压16/10.7kPa(120/80mmHg),宫高35cm,胎位LOA,胎心130次/min。拟行胎盘功能测定,下列哪项表示胎盘功能减退
男性,18岁。咳嗽,咯黄稠痰,咳时汗出口渴身热,恶风肢楚,舌苔薄黄,脉浮数。
女,32岁,以往月经正常,一年前曾足月分娩二子,因产后大出血,乳汁分泌少,人工喂养,现产后年余未来月经。妇检:子宫略小,曾用雌一孕激素治疗,有出血,FSH、LH均<5U,垂体兴奋试验无反应。患者最可能的诊断是
下列房地产经纪人行为中,属于不正当竞争行为的有()。
建筑材料的性质有物理性质、力学性质、耐久性等。()
游客在九宫山顶观赏云雾缭绕的云中湖,欣赏九宫十景之一的“云湖夕照”时,适宜采用()。
Itwouldbeinterestingtodiscoverhowmanyyoungpeoplegotouniversitywithoutanyclearideaofwhattheyaregoingtodoa
在下列关键字中,不能用来表示继承方式的是()。
Languageisoneofthedefiningcharactersofourspecies,butweknowvirtuallynothingaboutwhereitcamefrom."Wehavealo
最新回复
(
0
)