首页
登录
职称英语
The ocean bottom—a region nearly 2. 5 times greater than the total land area
The ocean bottom—a region nearly 2. 5 times greater than the total land area
游客
2023-12-31
29
管理
问题
The ocean bottom—a region nearly 2. 5 times greater than the total land area of the Earth—is a vast frontier that even today is largely unexplored and uncharted. Until about a century ago, the deep-ocean floor was completely
inaccessible
, hidden beneath waters averaging over 3, 600 meters deep. Totally without fight and subjected to intense pressures hundreds of times greater than at the Earth’ s surface, the deep-ocean bottom is a hostile environment to humans, in some ways as forbidding and remote as the void of
outer space
.
Although researchers have taken samples of deep-ocean rocks and sediments for over a century, the first detailed global investigation of the ocean bottom did not actually start until 1968, with the beginning of the National Science Foundation’ s Deep Sea Drilling Project(DSDP). Using techniques first developed for the offshore oil and gas industry, the DSDP’ s drill ship, the Glomar Challenger, was able to maintain a steady position on the ocean’ s surface and drill in very deep waters ,
extracting
samples of sediments and rock from the ocean floor.
The Glomar Challenger completed 96 voyages in a 15-year research program that ended in November 1983. During this time, the vessel logged 600, 000 kilometers and took almost 20, 000 core samples of seabed sediments and rocks at 624 drilling sites around the world. The Glomar Challenger’ s core samples have allowed geologists to reconstruct what the planet looked like hundreds of millions of years ago and to calculate what it will probably look like millions of years in the future. Today, largely on the
strength
of evidence gathered during the Glomar Challenger’ s voyages, nearly all earth scientists agree on the theories of plate tectonics and continental drift that explain many of the geological processes that shape the Earth.
The cores of sediment drilled by the Glomar Challenger have also yielded information critical to understanding the world’ s past climates. Deep-ocean sediments provide a climatic record stretching back hundreds of millions of years, because
they
are largely isolated from the mechanical erosion and the intense chemical and biological activity that rapidly destroy much land-based evidence of past climates. This record has already provided insights into the patterns and causes of past climatic change—information that may be used to predict future climates. [br] The word "strength" underlined in Paragraph 3 is closest in meaning to______.
选项
A、basis
B、purpose
C、discovery
D、endurance
答案
A
解析
本题考查词义判断。因为on the strength of为固定结构,意为“基于,凭借”,on the basis of意为“在……基础上”,所以,答案是A。B、C、D三项均没有这种结构。
转载请注明原文地址:https://tihaiku.com/zcyy/3322043.html
相关试题推荐
LongIsland,anislandthatformsthesoutheasternpartofNewYork,hasgreater
Greatereffortstoincreaseagriculturalproductionmust______iffoodshortagei
Thestormhascaused______tothisregion.A、manydamagesB、muchdamagesC、muchda
Inmountainousregions,muchofthesnowthatfallsiscompactedintoice.A、brok
Insuranceisthesharingof【C1】______.Nearlyeveryoneisexposed【C2】______r
Insuranceisthesharingof【C1】______.Nearlyeveryoneisexposed【C2】______r
Insuranceisthesharingof【C1】______.Nearlyeveryoneisexposed【C2】______r
Insuranceisthesharingof【C1】______.Nearlyeveryoneisexposed【C2】______r
Insuranceisthesharingof【C1】______.Nearlyeveryoneisexposed【C2】______r
Insuranceisthesharingof【C1】______.Nearlyeveryoneisexposed【C2】______r
随机试题
SometimesIwishI______inadifferenttimeandadifferentplace.A、beliving
ThemenandwomenofAnglo-SaxonEnglandnormallyboreonenameonly.Disti
男性,25岁,汽车撞击右髋部4小时,有尿意但不能自主排尿。体检:血压110/80
()是《中华人民共和国教师法》中规定的教师应享有的待遇。A.工资 B.住房
护士告诉慢性肝炎患者勿食过多的糖是因为A.易引起腹胀B.易致ALT升高C.易致胃
开关柜隔离(接地)开关闸刀在合闸位置时,动静触头间存在明显间隙,导致动静触头接
在某地的新农村建设中,农民的意见主要有:医院、学校至少要建一个;如果学校、商店都
(2018年11月)()表明员工在制度规定的工作时间内实际出勤工作的程度。
股票期权的特点包括()。 A.是经营者的义务B.有利于降低企业的激励成本
48岁女性.近日自觉背部沿肋间皮肤灼痛,进而出现红疹、疱疹、串连成带状。幼儿时患
最新回复
(
0
)