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
What does the movement of plants and animals from Asia to America indicate? Which reason for the migration is mentioned?
What does the movement of plants and animals from Asia to America indicate? Which reason for the migration is mentioned?
admin
2022-08-25
64
问题
What does the movement of plants and animals from Asia to America indicate?
Which reason for the migration is mentioned?
There is no doubt that human came only recently to the Western Hemisphere. None of the thousands of sites of aboriginal habitation uncovered in North and South America has antiquity comparable to that of Old World sites. Human’s occupation of the New World might date several tens of thousands of years, but no one argues he has been here even 100,000 years.
Deduction as to how man found the way to America was lively at the outset and the proposed routes boxed the compass. However, with one or two notable exceptions, students of American anthropology soon settled for the reasonable idea that the first immigrants came from a land bridge which had connected the northeast comer of Asia to the northwest comer of North America across the Bering Strait. Mariners supplied the reassuring information that the strait is not only narrow but also shallow. With little eels in the way of evidence to sustain the Bering Strait land bridge, anthropologists predicted that man walked dry-shod from Asia to America.
However, at the end of the last century, it became obvious that the Western Hemisphere was the New World not only for human but also for some animals and plants. Zoologists and botanists showed subjects of their respective kingdoms must have originated in Asia and then spread to America. These findings were neither astonishing nor totally unexpected. Such spread of populations is not to be conceived as an departure or mass migration. It is a spilling into new territory that accompanies increase in numbers. But the enormous traffic in plant and animal’s forms casted a heavy burden on the Bering Strait land bridge as the anthropologists ahead predicted it. Whereas purposeful men can make their way across a narrow bridge, the slow diffusion of animals and plants will need an avenue as a continent and available for ages at a stretch.
选项
A、Food.
B、Favorable environmental conditions.
C、Famine.
D、The existence of a land bridge.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/a2Pd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
Theauthorthinksthatpeople’sattitudetowarddrugsresemblearollercoasterbecausebothcases______.Accordingtothepas
Manygrownpeoplenowbelievethat______.WhichofthefollowingstatementsisNOTtrue?
______tellsusthatthegovernmentwillgivesupporttoemployers,whoofferpart-timejobs?______statesthatjob—sharingca
WhatwasSteve’sattitudetowardswomenwhowrotelovestories?HelenthoughtStevemightnotbecontentofStrettonbecause___
BetweenWTOandGAIT______.WhichofthefollowingisNOTtrueabouttheWTO?
Travellingcompanionsareadisadvantage,accordingtothewriter,becausethey______.Hismainconcernintheeveningswasto
______ispopularinthesouth?______isofspecialvalueforperfumemakingbecauseofitsfragrance?
InanupmarketrestaurantnearCambridgecitycentre,twelveyoungmenandwomensitaroundalarge,linen-coveredtablesetwi
Anallergyisanunusuallystrongreaction(31)asubstance.Manythingscancauseallergies.Themostcommoncauseispollen.T
A=TheImperialPalaceB=TheTempleofHeavenC=PotalaPalaceD=JokhangTempleWhichpalaceortemple...isthespiritualc
随机试题
心脏骤停时人体各器官耐受缺血缺氧的时间不同,一般大脑组织约()
Evenacarefulmotoristmayhavethemisfortunetocommitamotoring【C1】______.Induecourse,【C2】______asummons(传票),hewillap
A.3~4个月B.6个月C.1~3个月D.7~10天E.4~6个月放射性131I治疗甲亢,症状明显缓解或治愈在治疗的
男性高中生,3d前因咽痛、流涕、干咳、发热而就诊,体温多在38℃左右,自服感冒药无效。同寝室有类似患者。体检右下肺有少量干啰音。X线片显示右下肺淡薄阴影。红细胞冷凝集试验1:128。根据病情,推测其最可能的病原体是
某上市公司股本总额8000万元,股票面值10元。以下情况中,构成该公司股票暂停上市的原因的是哪一个?()
关于投资权益保护,以下说法错误的是()。
2013年12月31日,甲公司以银行存款3000万元取得乙公司60%的股权,能够对乙公司实施控制,形成非同一控制下的企业合并。购买日,乙公司可辨认净资产的公允价值为4500万元。2014年12月10日甲公司又出资520万元自乙公司的其他股东处取得乙公司10
如图所示,扇形纸扇完全打开后,外侧竹条AB、AC夹角为120°,AB的长为30,贴纸部分BD的长为20,则贴纸部分的面积为:[img][/img]
WhenisThanksgivingDaycelebrated?
A、1:15.B、2:00.C、0.0625D、0.145833B从文中明确得知图书馆的展出活动时间为下午两点。
最新回复
(
0
)