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
49
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
Somemodemcitiesareusuallyfamousforpeoplewholiveaverylongtime.
Itisgenerallyacknowledgedthatfamiliesarenownotascloseastheyusedtobe.Givepossiblereasonsandyourcommendations
Inthefollowingarticlesomeparagraphshavebeenremoved.ForQuestions66~70,choosethemostsuitableparagraphfromthelis
Theideaofafishbeingabletoproduceelectricitystrongenoughtolightlampbulbs-oreventorunasmallelectricmotor—is
Supermarketshoppershaveneverbeenmorespoiltforchoice.Butjustwhenwethoughttraditionalsystemsofselectivefarmingh
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【31】______tothe
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【31】______tothe
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【31】______tothe
Consumersandproducersobviouslymakedecisionsthatmoldtheeconomy,butthereisathirdmajorelementtoconsider—therol
Aneweraisuponus.Callitwhatyouwill:theserviceeconomy,theinformationage,theknowledgesociety.Italltranslates
随机试题
下列有关退火、正火件装炉前的准备中()是错误的。
试述最密切联系原则的优缺点。
患者,女性,30岁,结婚两年未孕,第三年怀孕两个月左右出现胎停育。当患者发现有少量出血时,家人就陪同其前往医院检查,经B超检查后发现胎儿没有心跳声,诊断为胎停育,故医生建议采用无痛人流手术。但家属不愿意就这样失去这个孩子,请求医生尽一切办法保胎。经过主治医
要正确认识和处理政府和市场的关系,充分发挥市场在资源配置中的()作用。
总价合同按其是否可以调值又可分为()。
当获证企业发生质量体系严重不符合规定的情况时,认证机构可以做出( )的决定。
口岸检验检疫机构对在到达本口岸前已由国外其他口岸实施卫生处理的交通工具不再实施卫生处理。( )
当经济处于过热时期,政府应采取的投资政策措施是()。
Afterthebirthofmysecondchild,Igotajobatarestaurant.Havingworkedwithanexperienced【C1】______forafewdays.Iwa
从人口的空间布局看,城镇化是农村人口向城镇转移,是农民向市民的转变。农民向市民的转变过程,是人的素质的现代化过程。而人的素质的现代化离不开接受现代化的教育。人的教育的现代化是城镇化的基础和支撑。城镇化还意味着人们的就业和生产从农业领域向工业和服务业的转移。
最新回复
(
0
)