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


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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 12000 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 15000 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 8400-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 17000 years ago at least 5000 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.

(1):本文选自Newsweek; 11/15/99 p71;

(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 Stanfords 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

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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。

共有n辆车,则能确定人数.(1)若每辆20座,辆车未坐满.(2)若每辆12座,则少10个座.

A.条件(1)充分,但条件(2)不充分.
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.
答案:E
解析:

好发于长骨干骺端的骨肿瘤是


A.骨瘤B.骨软骨瘤 C.骨巨细胞瘤D.内生软骨瘤

答案:B
解析:
[考点]骨肿瘤的好发部位
[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。

设二次型
  (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.

答案:
解析:

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