阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个答案，涂在答题卡相应的位置上。
Earth's Inner Core
Scientists 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．
In 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．
But 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 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
参考答案
51 c turn to other evidence：寻求其他证据。Tum to属固定搭配。
52 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。
56 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。
57 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。
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。
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。
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”。
64 D nickel和silicon的混合物，compound：混合物。
65 c fission—split：裂变。经历裂变，用动词experience.
Earth's Inner Core
Scientists 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．
In 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．
But 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 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
参考答案
51 c turn to other evidence：寻求其他证据。Tum to属固定搭配。
52 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。
56 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。
57 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。
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。
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。
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”。
64 D nickel和silicon的混合物，compound：混合物。
65 c fission—split：裂变。经历裂变，用动词experience.
