2012年职称英语理工类B级完型指导练习及答案（2）

会计考友

Earth's Inner Core
. o  t0 N7 e- J6 k- VScientists 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．
9 C1 M% d$ h% G8 [3 IIn 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．
5 ?6 B6 Y: o% A: B6 fBut 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．
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
52 A create B receive C feel D overcome
: X* h, m# n4 T- k5 ^% K2 b* }53 A work B solution C job D patterns
5 K( q: A- _9 `3 @" n. q54 A whether B what C why D how
55 A from B within C of D to
. C. G6 }% w9 A2 P# i56 A followed B dominated C restored D opposed
57 A ideas B demands C phenomena D movements
  _  Q( ^8 I4 g  v3 B. t+ v58 A things B acts C methods D records
& ~( p8 q+ K( T' Q3 T# ^+ }59 A taken B benefited C left D kept
60 A after B before C since D when
3 H1 L. Z0 D5 T: A6 I/ V" l% q61 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
* m" C) I& |+ t' o" h64 A system B copy C model D compound
5 [! o9 {& ?0 [+ Q2 F4 m65 A charge B last C experience D show

会计考友

</p>答案:
51 C turn to other evidence：寻求其他证据。Tum to属固定搭配。
- T. S, f+ k9 `; P+ X- S52 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。
4 U# m: i' a$ R; F' Q55 C compose of：由……组成。固定短语。
: t' T$ d, P8 t. t56 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。
9 c; C+ r( t( C7 J9 q3 u+ i; w3 ?4 n57 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。
, d( t! N; t) m9 m$ r! [' r; s59 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。
- e. h2 F2 s% M60 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（这里指地球）变冷的过程中，它逐渐获得了质量。
6 H  _) j: n7 u& E62 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。
' x# H% J+ l7 D* p) G1 C8 }; s65 C fission-split：裂变。经历裂变，用动词experience.