2014職稱英語(yǔ)考試（理工類）完形填空專練6

　　點(diǎn)擊進(jìn)入：2014職稱英語(yǔ)考試(理工類)完形填空專練匯總　

　German scientist detected a severe earthquake in Japan

　　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 (晃動(dòng)) 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 (難倒) 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 (球體). 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 (溫和的) 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

　　參考答案:

　　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

　　課程推薦：零基礎(chǔ)高效通關(guān)職稱英語(yǔ)，網(wǎng)校12小時(shí)助您穩(wěn)拿68分

    環(huán)球網(wǎng)校友情提示：如果您在此過(guò)程中遇到任何疑問(wèn)，請(qǐng)登錄環(huán)球網(wǎng)校職稱英語(yǔ)頻道及論壇，隨時(shí)與廣大考生朋友們一起交流!

    編輯推薦：
    2014年職稱英語(yǔ)考試報(bào)名時(shí)間匯總
    2013年職稱英語(yǔ)考試真題及答案交流
    2014年職稱英語(yǔ)等級(jí)考試輔導(dǎo)招生簡(jiǎn)章
    2014年職稱英語(yǔ)考試高端押題保過(guò)套餐
    環(huán)球網(wǎng)校2012職稱英語(yǔ)考試輔導(dǎo)通過(guò)率