職稱英語考試理工類真題精選—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個選項，請根據短文的內容從4個選項中選擇1個最佳答案，涂在答題卡相應的位置上。
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）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。Tum to屬固定搭配。
52 A create jolts：造成震動。其他幾個選項意思不符。
53 D wayes#39;patterns：波浪的形狀。科學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成的難倒了她。這里應使用what構成名詞性從旬，作主語。
55 c compose of：由……組成。固定短語。
56 B dominate：占統治地位，支配。Lehamann的發現在傳統地球科學領域占統治地位。
57 A 此處的意思是：現在的科學家正用新的、激進的觀點挑戰傳統的理論。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：通過分析數十萬次地震波的記錄，他們認為……。其他幾個選項與句意不符。
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留下來的最古老的化石。
60 A 依據上下文，應用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，它逐漸獲得了質量。
62 B 本文主要談地球起源問題，故此處應填ongm.
63 A 本句前面出現的一個詞是“tame”，與之對應，應該是“radical”。
64 D nickel和silicon的混合物，compound：混合物。
65 c fission—split：裂變。經歷裂變，用動詞experience.
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