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(qǐng)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(duì)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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