考前必看:2021年考研英语理学类阅读理解模拟题及答案(七)
发布时间:2020-10-12
2021年考研初试备考还有最后的近三个月时间,相信大家也都在紧张的复习当中。在复习时,多做练习题可以让我们更加了解考试内容。下面,51题库考试学习网为大家带来考研初试的一些模拟试题,正在备考的小伙伴赶紧练起来吧。
For 30 years, Smithsonian Institution archeologist Dennis Stanford searched in
vain for the origins of the first Americans. Every textbook described how
mammoth-hunters from Siberia had migrated across the Bering land bridge about
12,000 years ago and
had slowly wandered south and east until they filled the New World. In each of
their settlements, this theory held, the original Americans left their
calling cards: distinctively
shaped spear points named after the site in Clovis, N.M., where the stone tips were first unearthed. If this account was
right, Stanford reasoned, then Siberia should be littered with
similar points. But not a single Clovis point has turned up in Siberia. And now
Stanford has a radical new proposal to explain why. Clovis people, he thinks, came from Europe——arriving
15,000 years before
Columbus, and by boat. “They were from Iberia, not Siberia,” Stanford told startled colleagues at an
archeology conference last month.
Debate over a European connection has
dogged anthropology in recent months, though until now no one of Stanford\'s stature had stated it so
un-equivocally and publicly. But the similarities between the oddly shaped
stone points of Clovis and the European culture called Solutrean strongly
suggest this conclusion, say
Stanford and colleague Bruce Bradley. Moreover, tools recently found beneath Clovis-era layers at a dig in Cactus
Hill, Va.——about where European itinerants could
have first landed——also resemble
Solutrean artifacts. The Solutrean theory poses similar questions to those
raised by Kennewick Man, the 8,400-year-old skeleton found in Washington
state in 1996 and initially called European by an anthropologist. A new federal
study to help determine whether K-Man\'s remains should be turned over to local
tribes just concluded that the body looked more Asian than European, though not Siberian. But it didn\'t match
any modern Indian tribe, a
finding that Indians see as the latest scheme to deny tribes the right to
repatriate and rebury such remains.
Native Americans aren\'t the only ones
dismayed by the Euro theory. Solutrean expert Lawrence Straus, an anthropology professor at the
University of New Mexico, dismisses the resemblance between the spear points as an instance of two
cultures\' arriving at a similar idea independently. “This is a classic case of convergence,” says Straus. “And it\'s not even a tricky case.” Moreover, Solutrean culture ended 17,000 years ago, at
least 5,000 years before
the first evidence of Clovis culture. And there is no evidence that Solutreans
had the requisite boats to paddle across the North Atlantic.
Many scientists grumble that Stanford
should publish his findings in peer-reviewed journals be-fore talking in
public. Stanford promises to publish soon, but in the meantime, he
says, “I\'m trying to get people to think more broadly.” No argument there.
注(1):本文选自Newsweek; 11/15/99, p71;
注(2):本文习题命题模仿对象2004年真题Text 4
1. What does Stanford think of the origins
of the first Americans?
[A]He thinks that the first Americans came
from Clovis, N.M.
[B]He agrees with the common idea that the
first Americans came from Siberia.
[C]He thinks that the first Americans came
from Europe.
[D]He thinks that it was people from Iberia
who first invented the boat and came to America.
2. We can learn from the text that Indian
tribes regard the results of the federal study as _______.
[A]a tricky scheme
[B]convincing enough
[C]a cute trap
[D]unreasonable
3. The views of Lawrence Straus and
Stanford are _________.
[A]identical
[B]similar
[C]complementary
[D]opposite
4. According to Lawrence Straus, the spear points __________.
[A]show the products makers came from the
same culture
[B]do not show any connection between the
two cultures
[C]are not the products of the different
inhabitants
[D]show the resemblance of the two
different cultures
5. Which of the following statement is
true?
[A]K-Man\'s remains helped to certify
Stanford‘s assertion.
[B]The first Americans came from Europe by
boat.
[C]Anthropologists fail to make such a
certain statement as Stanford.
[D]It was the Indian tribes‘ rights to rebury the K-Man\'s remains.
答案:CADBC
以上就是51题库考试学习网为大家带来的全部内容,希望能给大家一些帮助。51题库考试学习网提醒:以上内容仅为参考,在做试题练习时,小伙伴们还是要以考研大纲为准,有针对性的去做题哦。最后,51题库考试学习网预祝参加2021年考研初试的小伙伴都能取得优异的成绩。
下面小编为大家准备了 研究生入学 的相关考题,供大家学习参考。
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和(2)单独都不充分,条件(1)和(2)联合起来也不充分.
A.骨瘤B.骨软骨瘤 C.骨巨细胞瘤D.内生软骨瘤
[分析]不同的骨肿瘤有不同的好发部位,了解此对诊断有帮助。骨巨细胞瘤多见于年轻成人,此时,骨骺已闭合,故好发于长骨骨端。骨软骨瘤好发于长骨干骺端。骨瘤好发于扁骨。内生软骨瘤好发于手足的管状骨。
(b>0),
其中二次型的矩阵A的特征值之和为1,特征值之积为-12.
(1)求a,b的值;
(2)利用正交变换将二次型f化为标准形,并写出所用的正交变换和对应的正交矩阵.
声明:本文内容由互联网用户自发贡献自行上传,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任。如果您发现有涉嫌版权的内容,欢迎发送邮件至:contact@51tk.com 进行举报,并提供相关证据,工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。
- 2020-10-10
- 2020-09-03
- 2020-10-22
- 2020-10-18
- 2020-10-17
- 2020-10-15
- 2020-10-17
- 2020-10-12
- 2020-10-12
- 2020-10-25
- 2020-10-26
- 2020-10-26
- 2020-10-14
- 2020-10-26
- 2020-10-23
- 2020-10-15
- 2020-10-15
- 2020-10-14
- 2020-10-14
- 2020-10-23
- 2020-10-10
- 2020-10-22
- 2020-10-11
- 2020-10-15
- 2020-10-26
- 2020-10-18
- 2020-10-18
- 2020-10-11
- 2020-10-18
- 2020-10-18