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2008职称英语考前每日一练(理工类第37期-A级)

4

第6部分:完形填空  (第5l~65题,每题1分,共1 5分)
阅读下面的短文,文中有15处空白,每处空白给出了4个选项,请根据短文的内容从4个选项中选择1个最佳答案,涂在答题卡相应的位置上。
 
                          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(熔化了的)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 4.8billion 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 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 Hemdon has a truly revolutionary notion:Within the nickel silicide(硅化物)inner core is also an"inner"inner core-an 8 km-wide ball of the element uranium.Uranium is radioactive.Hemdon thinks the uranium releases heat energy as its atoms_____(65)fission-split and crash into another in a chain reaction. In other words,we may live on top of a gigantic, "natural"nuclear power plant.
 
51 A  try     B leave   C turn   D point
52 A  create   B  receive  C feel D overcome
53 A  work   B solution  C job D patterns
54 A whether  B what C why D how
55 A  from   B  within   C  of    D  to
56 A  followed  B  dominated   C  restored   D  opposed
57 A  ideas   B  demands  C  phenomena   D  movements
58 A things   B  acts  C  methods  D  records
59 A taken    B  benefited  C  left  D  kept
60 A after   B  before  C  since  D when
61 A expanded   B  modified  C  gained  D  melted
62 A size   B  origin  C  structure  D  shape
63 A radical   B  traditional  C  classical  D  conventional
64 A system   B  copy  C  model  D  compound
65 A charge   B  last  C  experience  D show

答案:
51 C  turn to other evidence:寻求其他证据。Tum to属固定搭配。
52 A  create jolts:造成震动。其他几个选项意思不符。
53 D  wayes'patterns:波浪的形状。科学家通过研究震波的形状了解地球的情况。
54 B  此处的意思是地心是由什么构成的难倒了她。这里应使用what构成名词性从旬,作主语。
55 C  compose of:由……组成。固定短语。
56 B dominate:占统治地位,支配。Lehamann的发现在传统地球科学领域占统治地位。
57 A  此处的意思是:现在的科学家正用新的、激进的观点挑战传统的理论。本题只有填ideas才符合本句的意思。
58 D  此处填records,本句的意思是:通过分析数十万次地震波的记录,他们认为……。其他几个选项与句意不符。
59 C left:留下来的。此处的意思是:这一球体可能是地球形成时留下来的最古老的化石。
60 A  依据上下文,应用afte~句子意思才讲得通。
61 C  gain:获取。gained mass as the planet cooled:在星球(这里指地球)变冷的过程中,它逐渐获得了质量。
62 B  本文主要谈地球起源问题,故此处应填ongm.
63 A  本句前面出现的一个词是"tame",与之对应,应该是"radical".
64 D  nickel和silicon的混合物,compound:混合物。
65 C  fission-split:裂变。经历裂变,用动词experience.
 

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