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
2025-01-19
8
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 a hostile environment to humans, in some ways as forbidding and remote as the void of outer space”可知,作者在此提到outer space是为了说明the deep-ocean bottom is a hostile environment to humans,所以,答案是B。
转载请注明原文地址:https://tihaiku.com/zcyy/3919673.html
相关试题推荐
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandarea
NearlyeveryoneinBritainwouldliketoowntheirownhomeand,whethertheydo
Fornearlyacentury,twoUnitedStatesgovernmentalagencies,theUnitedSt
Fornearlyacentury,twoUnitedStatesgovernmentalagencies,theUnitedSt
Fornearlyacentury,twoUnitedStatesgovernmentalagencies,theUnitedSt
随机试题
[originaltext](5)TheWomen’sWorldCupfinalmatchbetweentheUSandJapan
[audioFiles]audio_eufm_j31_001(20082)[/audioFiles]A、Heisusinghiscomputerfo
颌面部间隙感染化脓局限期称为() A.包块 B.硬结 C.脓肿
确定教学目标的原则是()。A.主体性原则、渐进性原则、集中性原则、多样性原则
审计人员收到的函证复函属于:A.实物证据 B.书面证据 C.内部证据 D.
无效合同从其( )时起没有法律效力。A:被确认无效 B:履行 C:订立
贷款发放审查的内容不包括( )A.质押合同审查 B.提款期限审查
课程评价过程中要解决的基本问题和把握的步骤有哪些?()A.评价概念是否合适 B
有关牙周病致病菌较为公认的观点是A.菌斑大量堆积导致牙周病 B.外源性特异致病
关于矿山地面工程的高程控制网的设立,做法不正确的是()。A.应保持高程点在施工
最新回复
(
0
)