2012年职称英语理工类B级完型指导练习及答案（2）

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Earth's Inner Core
6 E" V: Q+ ]( b3 mScientists 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．
3 c3 D. ~7 d* |1 S2 a! hIn 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．
, Z6 Y3 O3 V5 IBut 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．
% B; B( m7 m. `7 \' ?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
. J. w" d2 x, D7 F9 T0 k52 A create B receive C feel D overcome
53 A work B solution C job D patterns
+ G0 F/ a- I, ~7 a% y9 F! r54 A whether B what C why D how
, ?6 K2 P: w$ V4 `# {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
) Z+ j0 R$ V  l) V9 Z  n61 A expanded B modified C gained D melted
62 A size B origin C structure D shape
3 h. l. n* n6 _! C8 M63 A radical B traditional C classical D conventional
' d' i  f) r" S  |  `1 S4 o64 A system B copy C model D compound
5 c. U- m. I9 C$ W65 A charge B last C experience D show

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</p>答案:
51 C turn to other evidence：寻求其他证据。Tum to属固定搭配。
8 f4 ]# Y& Z5 B6 s6 M52 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。
8 P, j- D3 A8 n/ v" V7 `8 ]  w56 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。
' z1 D' Y; H  D: x& p57 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。
/ S, e3 n& p2 p4 }: `6 W58 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。
" U! |+ t  f, x61 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".
( ]& J6 J. \' N0 N# t64 D nickel和silicon的混合物，compound：混合物。
! ?9 X3 ~6 F7 g) c  A* I) J65 C fission-split：裂变。经历裂变，用动词experience.