首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
Earth’s Inner Core Scientists have long struggled to understand what lies at...
Earth’s Inner Core Scientists have long struggled to understand what lies at...
admin
2020-12-24
3
问题
Earth’s Inner Core
Scientists have long struggled to understand what lies at the planet’s center. Direct observation of its center is impossible, so researchers must _______ (51) to other evidence.
In 1889, a German scientist detected a severe earthquake in Japan. Geophysicists concluded that shock waves_______(52) jolts (晃动)from one side of Earth through the center to the other side. Then in 1936, Danish geophysicist Inge Lehmann studied the waves’________(53) to determine that within Earth’s core of molten (溶化了的)iron lies a solid inner core — but_______(54) that core was made of eluded (难倒)her. Other geophysicists quickly determined that Lehmann’s inner core was composed mostly _____(55) iron. Since then, Lehmann’s discovery has _______ (56) conventional Earth science.
But now scientists are challenging traditional theory with new and radical_______(57).For example, Earth’s center could actually contain an “inner core within the inner core”, claim Ishii and colleague Adam Dziewonski.
Analyzing hundreds of thousands of earthquake wave_______ (58), they maintain that the inner core has at its heart a tiny, even more solid sphere (球体).This sphere “may be the oldest fossil_______(59) from the formation of Earth,” says Dziewonski.
Dziewonski and Ishii speculate that shortly_______ (60) Earth formed around 4. 8 billion years ago, a giant asteroid (小行星)smashed into the young planet and nearly melted it. But Earth’s center didn’t quite melt; it_______(61) mass as the planet cooled.The core within a core may be the kernel (核心)that endured. “ Its presence could change our basic ideas about the ______ (62) of the planet/' Dziewonski says.
Dziewonski’s idea is tame (温和的)compared to the _______ (63) theories of independent geophysicist J. Marvin Herndon. Earth’s inner core is made not of iron, he claims, but a_______(64) of nickel and silicon. Herndon has a truly revolutionary notion:
Within the nickel silicide (桂化物)inner core is also an “inner” inner core — an 8 km-wide ball of the element uranium. Uranium is radioactive. Herndon thinks the uranium releases heat energy as its atoms_______(65) fission-split and crash into one another in a chain reaction.In other words,we may live on top of a gigantic, “natural”nuclear power plant.
选项
A radical
B traditional
C classical
D conventional
答案
A
解析
本句前面出现的一个词是“tame”,与之对应,应该是“radical”。
转载请注明原文地址:https://ti.zuoweng.com/ti/q7sQKKKQ
相关试题推荐
共用题干 Scientistsworkingonaproblemdonotknowandsometimescan'teveng...
共用题干 Scientistsworkingonaproblemdonotknowandsometimescan'teveng...
共用题干 UnderstandingAutism(孤独症)1Autismisalife-longdevelopmentaldisabili...
共用题干 UnderstandingAutism(孤独症)1Autismisalife-longdevelopmentaldisabili...
共用题干 UnderstandingAutism(孤独症)1Autismisalife-longdevelopmentaldisabili...
共用题干 ApproachestoUnderstandingIntelligencesItpaystobesmart,butweare...
共用题干 ApproachestoUnderstandingIntelligencesItpaystobesmart,butweare...
共用题干 ApproachestoUnderstandingIntelligencesItpaystobesmart,butweare...
Anewgenerationofscientistsbecamefascinatedbydinosaurs.A:intriguedB:infe
40Otherscientists’experimentsaresimilartoHo’sinAthesizeoftheexperi
随机试题
患者多食善饥,消瘦,血压140/60mmHg,双眼球突出。诊断应首先考虑的是
进行液体复苏时,不主张使用的是 A.5%葡萄糖溶液 B.乳酸林格液 C.白
在不同的情況下,建筑市场的内涵并非完全相同。一般来说,它是由市场交易主体、市场交
左边给定的是纸盒的外表面,右边哪一项能由它折叠而成?
下列选项中.描写在西汉末期与匈奴单于和亲,稳固边疆的人物的是()。A.西施浣纱B.貂蝉拜月C.昭君出塞D.贵妃醉酒
下列关于参与审核和核准股票发行申请的人员的说法中,不正确的是()。A、不得公开与发行申请人进行接触B、不得与发行申请人有利害关系C、不得直接或者间接接受发
图书馆存放或阅读珍贵资料的场所,不宜采用( )的光源。A.紫外光B.紫光C.红光D.红外线E.蓝光
在某少年宫工作的社会工作者小刘,为一些存在亲子冲突的家庭设计了亲子平行沟通小组。以下表格所列的上组活动计划中,与父母组的“分析聆听的障碍”活动相对的应该是...
培训与开发体系中最难实施的一个环节是()A.需求调查B.专职培训科室C.具体实施D.效果评估
主营太阳能电池组件业务的日华公司上市后,通过股权融资、债券融资、银行借贷、信贷融资、民间集资等各种手段融资近70亿元,在多个国家投资布局光伏全产业链,还大...