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2012年职称英语卫生类B级阅读理解(2012.2.20)

2012-02-20 00:00:00 来源:网络考研资料下载

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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个最佳答案。  

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 (1) to other evidence.

  In 1889, a German scientist detected a severe earthquake in Japan. Geophysicists concluded that shock waves (2) 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' (3) to determine that within Earth's core of molten (熔化了的) iron lies a solid inner core - but (4) that core was made of eluded (难倒) her. Other geophysicists quickly determined that Lehmann's inner core was composed mostly (5) iron. Since then, Lehmann's discovery has (6) conventional Earth science.

  But now scientists are challenging traditional theory with new and radical (7). 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 (8), 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 (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's center didn't quite melt; it (11) 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 (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 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. Herndon thinks the uranium releases heat energy as its atoms (15) fission-split and crash into one another in a chain reaction. In other words, we may live on top of a gigantic, "natural" nuclear power 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 D conventional

  14 A system B copy C model D compound

  15 A charge B last C experience D show

  参考答案:1. C  2. A  3. D  4. B  5. C 6. B  7. A  8. D  9. C  10. A 11. C  12. B  13. A  14. D  15. C

  解析:

  1. C 因为直接观察地球的中心是不可能的,所以研究者们就转向另外的证据,这里的turn to就有转向的意思。 

  2. A 振动波...晃动,这里选项A是创造、引起的意思,receive是接受的意思,feel是感觉的意思,over come是克服的意思,明显与原文不能搭配。

  3. D 因为上面是振动波引起的晃动,所以这里Lehmann研究的是振动波的震动频率。 

  4. B be made of是由...做成的意思,所以这里应该用what。 

  5. C be composed of 是由...组成的意思,固定搭配。

  6. B Lehmann's discovery has (6) conventional Earth science,通过阅读下一段话的第一句,我们可知道Lehmann的研究不是现代的研究,而是代表传统的研究,所以dominate用在这里比较合适。Lehmann主导了传统的地球研究。

  7. A 现代的科学家用..挑战传统的理论,显然A ideas比较合适。

  8. D hundreds of thousands 成千上万的,analyzing是研究分析的意思,这里指现代科学家们研究分析了成千上万次地震波的记录,所以选择D

  9. C fossil的意思是化石,显然这里的化石是地球形成的时候遗留下来的,所以应该选择left

  10. A shortly after是不久后的意思,这里意思是假设地球形成不久后,有一个小行星和地球相撞。

  11. C it (11) mass as the planet cooled,冷却时,地球的中心形成一团,这里的mass是团、堆的意思,所以答案C比较合适。

  12. B 改变我们对地球起源的看法,因为从头到尾文章讨论的是地球内部的组成成分而不是结构。

  13. A 与tame (温和的)相对应的是radical极端的。

  14. D a (14) of nickel and silicon. 镍和硅的混合物,所以选择D

  15. C uranium releases heat energy as its atoms (15) fission-split and crash into one another in a chain reaction 这里的as是当...的时候,当原子经历...时,铀释放出了能量,所以答案选择experience



 

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