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
10
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 author mentions "outer space" underlined in Paragraph 1 because______.
选项
A、the Earth’ s climate millions of years ago was similar to conditions in outer space
B、it is similar to the ocean floor in being alien to the human environment
C、rock formations in outer space are similar to those found on the ocean floor
D、techniques used by scientists to explore outer space were similar to those used in ocean exploration
答案
B
解析
本题考查推理判断。根据文章第一段最后一句“…the deep—ocean bottom is ahostile environment to humans,in some ways as forbidding and remote as the void of outerspace”可知,作者在此提到outer space是为了说明the deep—ocean bottom is a hostile envi—ronment to humans,所以,答案是B。
转载请注明原文地址:https://tihaiku.com/zcyy/3936599.html
相关试题推荐
Doyouagreeordisagreewiththefollowingstatement?Yourjobhasgreatereffe
Thefoodsupplywillnotincreasenearlyenoughtomatchtheincreaseofpopulat
ModifiedAgriculturalPracticesSinceagricultureaccountsfornearly70
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
Insuranceisthesharingof【C1】______.Nearlyeveryoneisexposed【C2】______r
随机试题
BeautyandBodyImageintheMediaA)Imagesoffemalebodiesareeverywhe
[img]2022m10x/ct_ve01204002j_0008_221018[/img]Letnandkbepositiveintegers
不同VLAN间数据通信,需通过()进行转发A.HUB B.二层交换机 C
《证券投资顾问业务暂行规定》明确规定证券公司、证券投资咨询机构应当对证券投资顾问
肾小管病变时,易出现A.红细胞管型B.颗粒管型C.上皮细胞管型D.蜡样管型E.透
下列血浆纤溶酶原活性减低的是A、DICB、下肢静脉血栓C、血小板减少症D、
房地产价格策略主要有()。A:折扣定价策略 B:心理定价策略 C:竞争导向定
通常情况下,比例税率的优点是()。A.税负公平 B.计算简便 C.具有自动调
进口特种设备,应当向进口地负责()履行提前告知义务。A.国务院 B.海关
某施工企业采购一批材料,出厂价3000元/吨,运杂费是材料采购价的5%,运输材料
最新回复
(
0
)