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
2023-12-25
24
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/3305117.html
相关试题推荐
Foralongtimeinthatvastregion,thislawwasinabeyance.A、activeuseB、dou
Attemptshavebeenmadefornearlythreedecadestoincreasetheamountofpreci
Foralongtimeinthatvastregion,thislawwasinabeyance.A、activeuseB、dou
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandar
Theheatinsummerisnoless______hereinthismountainregion.A、concentratedB
Itisknowntoallthatchildreninthisregionhavestrong______toswimmingin
Attemptshavebeenmadefornearlythreedecadestoincreasetheamountofpreci
随机试题
ChristianshavegenerallyregardedChristmasasbothaholydayandholiday.
[originaltext]Badnewsforthedeliveryguys:youmighthavetostartflunk
Surprisingly,nooneknowshowmanychildrenreceiveeducationinEnglishho
灰土垫层适用于加固处理1~3m厚的()土层。A.软弱 B.碎石 C.砂性
以下关于汉字编码的叙述中,错误的是()。A.采用矢量法表示汉字时,若两个汉字的笔
妊娠合并尖锐湿疣恰当的是A.胎儿宫内感染并不少见 B.通过软产道感染胎儿罕见
针对社区老年居民的糖尿病健康教育宜采用哪些形式?A.上门宣传 B.组织讲座
下列关于尿液试带法检测原理错误的是A.尿糖检测采用葡萄糖氧化酶.过氧化物酶法
银行的市场声誉属于无形资产,不包括()。 A.财务实力B.优质的服务 C
商业银行代理的财政性存款都需按()的比例划缴中国人民银行。A.50% B.
最新回复
(
0
)