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
5
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
2013年1~10月我国货物运输总量最大的领域是:
以一定单位的外国货币为标准,折算为本国货币来表示汇率的标价方法被称为()。
冬期施工开挖路堑表层冻土可采用的方法有()。
患者,男性,18岁,学生。晨跑后感左侧胸闷、胀痛,气促出冷汗。查体:神清,面色苍
根据《城乡规划法》的规定,以下关于乡和村庄建设规划管理的概念表述中不正确的是()
在行政诉讼中,对下列具体行政行为不服提起诉讼,人民法院可以不受理的案件是()。
内发论在中国古代的代表人物是____。
以下哪种说法是正确的A.COPD的β受体激动剂效果比抗胆碱能药物治疗好B.前列腺肥大的COPD老年患者不可以使用异丙托溴铵治疗C.吸入装置与治疗效果无关D
公司的经营战略分析属于()分析内容之一。A、公司技术水平B、公司成长性C、公司财务D、公司生命周期
不适合用煮沸消毒法消毒的是A:灌肠筒B:搪瓷药杯C:玻璃量杯D:纤维胃镜E:橡胶管