首页
登录
职称英语
The coastlines on the two sides of the Atlantic Ocean present a not
The coastlines on the two sides of the Atlantic Ocean present a not
游客
2024-01-11
48
管理
问题
The coastlines on the two sides of the Atlantic
Ocean present a notable parallelism: the eastern-
most region of Brazil, in Pernambuco, has a con-
Line vexity that corresponds almost perfectly with the
(5) concavity of the African Gulf of Guinea, while
the contours of the African coastline between Rio
de Oro and Liberia would, by the same approxi-
mation, match those of the Caribbean Sea.
Similar correspondences are also observed in
(10) many other regions of the Earth. This observation
began to awaken scientific interest about sixty
years ago, when Alfred Wegener, a professor at
the University of Hamburg, used it as a basis for
formulating a revolutionary theory in geological
(15) science. According to Wegener, there was origi-
nally only one continent or land mass, which he
called Pangea. Inasmuch as continental masses
are lighter than the base on which they rest, he
reasoned, they must float on the substratum of
(20) igneous rock, known as sima, as ice floes float on
the sea. Then why, he asked, might continents not
be subject to drifting? The rotation of the globe
and other forces, he thought, had caused the
cracking and, finally, the breaking apart of the
(25) original Pangea, along an extensive line repre-
sented today by the longitudinal submerged
mountain range in the center of the Atlantic.
While Africa seems to have remained static, the
Americas apparently drifted toward the west until
(30) they reached their present position after more than
100 million years. Although the phenomenon
seems fantastic, accustomed as we are to the con-
cept of the rigidity and immobility of the conti-
nents, on the basis of the distance that separates
(35) them it is possible to calculate that the continental
drift would have been no greater than two inches
per year. [br] It can be inferred from the passage that evidence for continental drift has been provided by the
选项
A、correspondences between coastal contours
B、proof of an original solitary land mass
C、level of sima underlying the continents
D、immobility of the African continent
E、relative heaviness of the continental masses
答案
A
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3352414.html
相关试题推荐
Atpresenttime,peoplehaveatrendtoliveinthe_________.A、suburbB、suburbs
Inthecircularregionshownabove,sectionsAandBrepresent3/8and5/11,res
If△and[img]2011q3/ct_egmatqm_egmatqchoose_0378_201121[/img]representsingle
Thefigureaboverepresentsawindow,withtheshadedregionsrepresentingopeni
Inanefforttoplanoutexpenses,theRobertsfamilyisrepresentingitsannual
Acertainmathematicaloperationmayberepresentedbythesymbol@.Forallnonz
Twodiceseachhassixsides,whichrepresentsixvalues1,2,3,4,5,6respec
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
随机试题
What’sHarold’sinterestwhilehe’spractisinglaw?[br][originaltext]W:Hi,H
Weareall(surprise)______atthenews.surprised本题考查固定短语。besurprisedat意为“对……吃
个体身心发展的一般规律有个体身心发展的顺序性、_____、不平衡性、互补性和__
公司公开发行股票的定价方式包括()。 ①与主承销商自主协商②合格投资者
下列需要临方捣碎的饮片是A:石膏B:石斛C:砂仁D:车前子E:五味子
下列关于胆固醇的描述哪项是错误的A.小肠是合成胆固醇的主要场所B.乙酰CoA是合
下列哪个结构中20位具有甲基酮,可与高铁离子络合A.黄体酮B.炔诺酮C.甲睾酮D
连舌本散舌下的经脉是A.足阳明胃经 B.足少阴肾经 C.足太阴脾经 D.足
入境的初榨椰子油(但未经化学改性),应向检验检疫机构申请()。 A.进口商品检
下列关于涉税鉴证业务鉴证准备的表述,错误的是( )。A.鉴证人承接涉税鉴证业务,
最新回复
(
0
)