2014年职称英语理工类B级完型指导练习(2)-查字典英语网
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2014年职称英语理工类B级完型指导练习(2)

发布时间:2016-03-01  编辑:查字典英语网小编

  Earths Inner Core

  Scientists have long struggled to understand what lies at the planets center, Direct observation of its center is impossible,so researchers must_____to other evidence.

  In 1889,a German scientist detected a severe earthquake in Japan.Geophysicists concluded that shock waves_____joltsfrom one side of Earth through the center to the other side.Then in 1936,Danish geophysicist Inge Lehmann studied the waves______ to determine that within Earths core of molteniron lies a solid inner core-but_____ that core was made of eludedher.Other geophysicists quickly determined that Lehmanns inner core was composed mostly_____iron. Since then, Lehmanns discovery has_____conventional Earth science.

  But now scientists are challenging traditional theory with new and radical _____ For example,Earths center could actually contain aninner core within the inner core,claim Ishii and colleague Adam Dziewonski.

  Analyzing hundreds of thousands of earthquake wave _____,they maintain that the inner core has at its heart a tiny, even more solid sphere . This spheremay be the oldest fossil____from the formation of Earth,says Dziewonski.

  Dziewonski and Ishii speculate that shortly_____ Earth formed around 4.8billion years ago,a giant asteroidsmashed into the young planet and nearly melted it. But Earths center didnt quite melt;it______mass as the planet cooled. The core within a core may be the kernelthat endured.Its presence could change our basic ideas about the_____ of the planet,Dziewonski says idea is tamecompared to the_____theories of independent geophysicist J.Marvin Herndon.Earths inner core is made not of iron,he claims but a_____of nickel and silicon Hemdon has a truly revolutionary notion:Within the nickel silicideinner core is also aninnerinner core-an 8 km-wide ball of the element uranium.Uranium is radioactive.Hemdon thinks the uranium releases heat energy as its atoms_____fission-split and crash into another in a chain reaction. In other words,we may live on top of a gigantic, naturalnuclear 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 wayespatterns: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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