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職稱英語考試?yán)砉ゎ愓骖}—完型填空

時(shí)間:2020-12-30 13:46:49 職稱英語 我要投稿

職稱英語考試?yán)砉ゎ愓骖}精選—完型填空

閱讀下面的短文,文中有15處空白,每處空白給出了4個(gè)選項(xiàng),請根據(jù)短文的內(nèi)容從4個(gè)選項(xiàng)中選擇1個(gè)最佳答案,涂在答題卡相應(yīng)的位置上。

  Earth#39;s Inner Core

  Scientists have long struggled to understand what lies at the planet#39;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(晃動(dòng))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#39;s core of molten(熔化了的)iron lies a solid inner core-but_____ (54)that core was made of eluded(難倒)her.Other geophysicists quickly determined that Lehmann#39;s inner core was composed mostly_____(55)iron. Since then,Lehmann#39;s discovery has_____(56)conventional Earth science.

  But now scientists are challenging traditional theory with new and radical _____(57) For example,Earth#39;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(球體) . This sphere#39;#39;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#39;s center didn#39;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(溫和的)compared to the_____(63)theories of independent geophysicist J.Marvin Herndon.Earth#39;s inner core is made not of iron,he claims but a_____(64)of nickel and si icon 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

  參考答案

  51 c turn to other evidence:尋求其他證據(jù)。Tum to屬固定搭配。

  52 A create jolts:造成震動(dòng)。其他幾個(gè)選項(xiàng)意思不符。

  53 D wayes#39;patterns:波浪的形狀?茖W(xué)家通過研究震波的形狀了解地球的情況。

  54 B 此處的意思是地心是由什么構(gòu)成的難倒了她。這里應(yīng)使用what構(gòu)成名詞性從旬,作主語。

  55 c compose of:由……組成。固定短語。

  56 B dominate:占統(tǒng)治地位,支配。Lehamann的發(fā)現(xiàn)在傳統(tǒng)地球科學(xué)領(lǐng)域占統(tǒng)治地位。

  57 A 此處的意思是:現(xiàn)在的科學(xué)家正用新的、激進(jìn)的觀點(diǎn)挑戰(zhàn)傳統(tǒng)的理論。本題只有填ideas才符合本句的意思。

  58 D 此處填records,本句的.意思是:通過分析數(shù)十萬次地震波的記錄,他們認(rèn)為……。其他幾個(gè)選項(xiàng)與句意不符。

  59 c left:留下來的。此處的意思是:這一球體可能是地球形成時(shí)留下來的最古老的化石。

  60 A 依據(jù)上下文,應(yīng)用afte~句子意思才講得通。

  61 c gain:獲取。gained mass as the planet cooled:在星球(這里指地球)變冷的過程中,它逐漸獲得了質(zhì)量。

  62 B 本文主要談地球起源問題,故此處應(yīng)填ongm.

  63 A 本句前面出現(xiàn)的一個(gè)詞是“tame”,與之對應(yīng),應(yīng)該是“radical”。

  64 D nickel和silicon的混合物,compound:混合物。

  65 c fission—split:裂變。經(jīng)歷裂變,用動(dòng)詞experience.

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