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
2025-01-31
30
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 "inaccessible" underlined in Paragraph 1 is closest in meaning to______.
选项
A、unrecognizable
B、unreachable
C、unusable
D、unsafe
答案
B
解析
本题考查词义推断。unreachable“不能达到的”;unrecognizable“未被承认的”;unusable“不能用的”;unsafe“不安全的,危险的”。根据语境可知,inaccessible在此处的意思应为“达不到的,难以接近的”,所以B为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/3936598.html
相关试题推荐
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
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
Coronaryangiography,asophisticatedmethodfordiagnosingcoronarydiseaseinv
AreBadEconomicTimesGoodforHealth?[A]Mostpeopleareworr
A. B. C. D.
公式sinθ1/C1=sinθ2/C2叫做()A.声阻抗比例公式 B.相位变化
学风建设的方法?
茯苓药材的显微特征是A.子座中央充满菌丝,每个子囊内有2~8个线形子囊孢子;子座
因环境污染损害赔偿提起诉讼的有效时限是(),从当事人知道或者应当知道受到污染损
行政体制的核心组成部分是( ),其也是行政体制得以正常运转的动力。A.政府组织
B
甲公司分立为乙公司和丙公司。在分立过程中,乙公司和丙公司对甲公司所欠丁、戊、己
最新回复
(
0
)