首页
登录
职称英语
"Migration from Asia" The Asian migration hypothesis is today supported by mo
"Migration from Asia" The Asian migration hypothesis is today supported by mo
游客
2024-01-03
16
管理
问题
"Migration from Asia"
The Asian migration hypothesis is today supported by most of the scientific evidence. The first "hard" data linking American Indians with Asians appeared in the 1980s with the finding that Indians and northeast Asians share a common and distinctive pattern in the arrangement of the teeth. But perhaps the most compelling support for the hypothesis comes from genetic research. Studies comparing the DNA variation of populations around the world consistently demonstrate the close genetic relationship of the two populations, and recently geneticists studying a virus sequestered in the kidneys of all humans found that the strain of virus carried by Navajos and Japanese is nearly identical, while that carried by Europeans and Africans is quite different.
The migration could have begun over a land bridge connecting the continents. During the last Ice Age 70,000 to 10,000 years ago, huge glaciers locked up massive volumes of water and sea levels were as much as 300 feet lower than today. Asia and North America were joined by a huge subcontinent of ice-free, treeless grassland, 750 miles wide. Geologists have named this area Beringia, from the Bering Straits. Summers there were warm, winters were cold, dry and almost snow-free. This was a perfect environment for large mammals—mammoth and mastodon, bison, horse, reindeer, camel, and saiga (a goatlike antelope). Small bands of Stone Age hunter-gatherers were attracted by these animal populations, which provided them not only with food but with hides for clothing and shelter, dung for fuel, and bones for tools and weapons. Accompanied by a husky-like species of dog, hunting bands gradually moved as far east as the Yukon River basin of northern Canada, where field excavations have uncovered the fossilized jawbones of several dogs and bone tools estimated to be about 27,000 years old.
Other evidence suggests that the migration from Asia began about 30,000 years ago—around the same time that Japan and Scandinavia were being settled. This evidence is based on blood type. The vast majority of modern Native Americans have type O blood and a few have type A, but almost none have type B. Because modern Asian populations include all three blood types, however, the migrations must have begun before the evolution of type B, which geneticists believe occurred about 30,000 years ago.
By 25,000 years ago human communities were established in western Beringia, which is present-day Alaska. A But access to the south was blocked by a huge glacial sheet covering much of what is today Canada. How did the hunters get over those 2,000 miles of deep ice? The argument is that the climate began to warm with the passing of the Ice Age, and about 13,000 b.c.e. glacial melting created an ice-free corridor along the eastern front range of the Rocky Mountains. B Soon hunters of big game had reached the Great Plains.
In the past several years, however, new archaeological finds along the Pacific coast of North and South America have thrown this theory into question. C The most spectacular find, at Monte Verde in southern Chile, produced striking evidence of tool making, house building, rock painting, and human footprints conservatively dated long before the highway had been cleared of ice. D Many archaeologists now believe that migrants moved south in boats along a coastal route rather than overland. These people were probably gatherers and fishers rather than hunters of big game.
There were two later migrations into North America. About 5000 b.c.e. the Athapascan or Na-Dene people began to settle the forests in the northwestern area of the continent. Eventually Athapascan speakers, the ancestors of the Navajos and Apaches, migrated across the Great Plains to the Southwest.
The final migration began about 3000 B.C.E after Beringa had been sub merged, when a maritime hunting people crossed the Bering Straits in small boats. The Inuits (also known as the Eskimos) colonized the polar coasts of the Arctic, the Yupiks the coast of southwestern Alaska, and the Aleuts the Aleutian Islands.
While scientists debate the timing and mapping of these migrations, many Indian people hold to oral traditions that include a long journey from a distant place of origin to a new homeland. [br] According to paragraph 2, why did Stone Age tribes begin to migrate into Beringia?
选项
A、To intermarry with tribes living there
B、To trade with tribes that made tools
C、To hunt for animals in the area
D、To capture domesticated dogs
答案
C
解析
"... Stone Age hunter-gatherers were attracted by these animal populations [large animals]." Choice A is not mentioned. Choice B is not correct because the tools were made from the animals, not traded with other tribes. Choice D is not correct because the dogs accompanied them.
转载请注明原文地址:https://tihaiku.com/zcyy/3329440.html
相关试题推荐
ThemigrationofAfricanAmericansfromtheruralSouthtothe(industrial)Nort
"MigrationfromAsia"TheAsianmigrationhypothesisis
"MigrationfromAsia"TheAsianmigrationhypothesisis
"MigrationfromAsia"TheAsianmigrationhypothesisis
"MigrationfromAsia"TheAsianmigrationhypothesisis
"MigrationfromAsia"TheAsianmigrationhypothesisis
"MigrationfromAsia"TheAsianmigrationhypothesisis
"MigrationfromAsia"TheAsianmigrationhypothesisis
"MigrationfromAsia"TheAsianmigrationhypothesisis
America’sWesternMigration1.AfterAmericadeclaredinde
随机试题
Hehadhardlyfinishedthearticle______thelightwentout.A、asB、untilC、than
[originaltext]Weuseallsortofserviceswithoutthinkingabouthowweget
在溴化锂吸收式制冷机中,下列描述正确的是()。A.为降低冷凝温度,冷却水温越
定量测定IgG的常用方法是A.血凝试验B.乳凝试验C.间接荧光免疫试验D.对流免
对更年期的叙述错误的是A.男性也有更年期在55~65岁B.女性更年期较男性早10
尿毒症最早出现的症状是A:心血管系统症状 B:胃肠道症状 C:血液系统症状
不符合手动火灾报警按钮设置要求的是()。A.列车上设置的手动火灾报警按钮,应设
2016年8月21日,中国女排以3-1战胜塞尔维亚女排,荣膺里约奥运会女排冠军。
脂酸合成所需的氢由下列哪种递氢体提供?( )A.NADPH+H+ B.NAD
关于机电工程招标投标管理要求下列说法错误的是()。A.投标文件应当对招标文件提
最新回复
(
0
)