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
46
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、Informative.
B、Optimistic.
C、Convincing.
D、Enthusiastic.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/QtPd777K
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.
Answerquestions71~80byreferringtothefollowinggames.Note:AnswereachquestionbychoosingA,B,CorDandmarkiton
Inthefollowingarticlesomeparagraphshavebeenremoved.ForQuestions66~70,choosethemostsuitableparagraphfromthelis
Theideaofafishbeingabletoproduceelectricitystrongenoughtolightlampbulbs-oreventorunasmallelectricmotor—is
ShortagesoffluvaccinearenothingnewinAmerica,butthisyear’sisawhopper.Untillastweek,itappearedthat100millio
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【31】______tothe
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【31】______tothe
Aneweraisuponus.Callitwhatyouwill:theserviceeconomy,theinformationage,theknowledgesociety.Italltranslates
Aneweraisuponus.Callitwhatyouwill:theserviceeconomy,theinformationage,theknowledgesociety.Italltranslates
随机试题
大李因盗窃罪被判处拘役5个月缓期5个月执行。大李对判决不服,认为自己犯罪是受人教唆,一时好奇,冲动而为,不应承担全部责任。针对大李的这些想法,社会工作者在帮助大李时,主要工作任务应是对其进行()。
肝昏迷病人前驱期(一期)最早的临床表现是
患者,男,42岁,腰部僵硬伴疼痛10年,双髋痛半年,伴跛行。提示:查体见脊柱僵硬,前屈畸形,活动完全丧失,右髋固定于功能位,活动度差,左髋活动度尚可。提示:强直性脊柱炎常累及骶髂关节与脊柱,也可以出现外周关节病变。强直性脊柱炎的外周关节病变较常见于
患者,女,47岁。咳嗽月余,加重周,咳引胸胁疼痛,痰少而稠,面赤咽干,舌苔黄少津,脉弦数。治疗应首选
电路如图7—2—8所示,Us为独立电压源,若外电路不变,仅电阻R变化时,将会引起下述哪种变化?()[2012年真题]
以下()币种不属于我国银行开办的外币存款业务。
托收承付结算制度中,验货付款的承付期为(),从运输部门向付款人发出提货通知的次日算起。
《野生植物保护条例》第十六条规定,禁止采集国家()保护野生植物。
下列有关血糖生成指数(GI)的叙述,正确的有()。
Tom’smothertriedhardtopersuadehimto______fromhisintentiontoinvesthissavingsinstockmarket.
最新回复
(
0
)