职称英语考试

试题来源：职称英语模拟题-理工类-完形填空
【单选题】

German scientist detected a severe earthquake in Japan

Scientists have long struggled to understandwhat lies at the planet's center. Direct observation of its center isimpossible, so researchers must (1) to other evidence

In 1889, a German scientist detected a severeearthquake in Japan. Geophysicists concluded that shock waves (2) jolts (晃动) from one side of Earth through the center to the other side. Thenin 1936, Danish geophysicist Inge Lehmann studied the waves' (3) to determinethat within Earth's core of molten (熔化了的) iron lies asolid inner core - but (4) that core was made of eluded (难倒) her. Other geophysicists quickly determined that Lehmann's innercore was composed mostly (5) iron. Since then, Lehmann's discovery has (6)conventional Earth science.

But now scientists are challenging traditionaltheory with new and radical (7). For example, Earth's center could actuallycontain an "inner core within the inner core," claim Ishii andcolleague Adam Dziewonski.

Analyzing hundreds of thousands of earthquakewave (8), they maintain that the inner core has at its heart a tiny, even moresolid sphere (球体). This sphere "may be the oldestfossil (9) from the formation of Earth," says Dziewonski.

Dziewonski and Ishii speculate that shortly(10) Earth formed around 4.8 billion years ago, a giant asteroid (小行星) smashed into the young planet and nearly melted it. But Earth'scenter didn't quite melt; it (11) mass as the planet cooled. The core within acore may be the kernel (核心) that endured. "Itspresence could change our basic ideas about the (12) of the planet,"Dziewonski says.

Dziewonski's idea is tame (温和的) compared to the (13) theories of independent geophysicist J.Marvin Herndon. Earth's inner core is made not of iron, he claims, but a (14)of nickel and silicon. Herndon has a truly revolutionary notion: Within thenickel silicide (硅化物) inner core is also an"inner" inner core - an 8 km-wide ball of the element uranium.Uranium is radioactive. Herndon thinks the uranium releases heat energy as itsatoms (15) fission-split and crash into one another in a chain reaction. Inother words, we may live on top of a gigantic, "natural" nuclearpower plant.

1 A try B leave C turn D point

2 A create B receive C feel D overcome

3 A work B solution C job D patterns

4 A whether B what C why D how

5 A from B within C of D to

6 A followed B dominated C restored D opposed

7 A ideas B demands C phenomena D movements

8 A things B acts C methods D records

9 A taken B benefited C left D kept

10 A after B before C since D when

11 A expanded B modified C gained D melted

12 A size B origin C structure D shape

13 A radical B traditional C classical Dconventional

14 A system B copy C model D compound

15 A charge B last C experience D show

试题出处：http://www.examtiku.com/shiti/168821439.html
网考网参考答案：C、A、D、B、C、B、A、D、C、A、C、B、A、D、C
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10%的考友选择了A选项
10%的考友选择了B选项
21%的考友选择了C选项
59%的考友选择了D选项
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