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l个最佳答案，涂在答题卡相应的位置上。
51、根据材料，回答{TSE}问题。
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. Geophysicistsconcluded that shock waves (52) _________ jolts (晃动) from one side of Earth through the centerto 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 quicklydetermined 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)_________. Forexample, Earth's center could actually contain an "inner core within the inner core, claim Ishiiand 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," saysDziewonski.
Dziewonski and Ishii speculate that shortly (60)_________ earth formed around 4.8billionyears ago, a giant asteroid (小行星) smashed into the young planet and nearly melted it. ButEarth's center didn't quite melt; it (61) _________ mass as the planet cooled. The core within acore 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 ismade not of iron, he claims but a(64)_________ of nickel and silicon Hemdon has a trulyrevolutionary notion: Within the nickel silicide (硅化物) inner core is also an "inner" innercore an 8 km -- wide ball of the element uranium. Uranium is radioactive. Hemdon thinksthe uranium releases heat energy as its atoms(65)_________ fission-split and crash into another in achain reaction. In other words, we may live on top of a gigantiC． "natural" nuclear powerplant.
请在第__(51)__处填上正确答案。
A．try
B．leave
C．turn
D．point
52、请在第__(52)__处填上正确答案。
A．create
B．receive
C．feel
D．overcome
53、请在第__(53)__处填上正确答案。
A．work
B．solution
C．job
D．patterns
54、请在第__(54)__处填上正确答案。
A．whether
B．what
C．why
D．how
55、请在第__(55)__处填上正确答案。
A．from
B．within
C．of
D．to
56、请在第__(56)__处填上正确答案。
A．followed
B．dominated
C．restored
D．opposed
57、请在第__(57)__处填上正确答案。
A．ideas
B．demands
C．phenomena
D．movements
58、请在第__(58)__处填上正确答案。
A．things
B．acts
C．methods
D．records
59、请在第__(59)__处填上正确答案。
A．taken
B．benefited
C．left
D．kept
60、请在第__(60)__处填上正确答案。
A．after
B．before
C．since
D．when
61、请在第__(61)__处填上正确答案。
A．expanded
B．modified
C．gained
D．melted
62、请在第__(62)__处填上正确答案。
A．size
B．origin
C．structure
D．shape
63、请在第__(63)__处填上正确答案。
A．radical
B．traditional
C．classical
D．conventional
64、请在第__(64)__处填上正确答案。
A．system
B．copy
C．model
D．compound
65、请在第__(65)__处填上正确答案。
A．charge
B．last
C．experience
D．show
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