2005年职称英语理工类A级考试真题（8）

会计考友

　　第6部分：完形填空 (第5l～65题，每题1分，共1 5分)
　　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，涂在答题卡相应的位置上。
; K' ?. U. ]0 g8 d9 Q8 U* l　　Earth’s Inner Core
" l! J8 E. e: a3 g　　Scientists have long struggled to understand what lies at the planet’s center, Direct
8 u) z# S. i! D" f  Y　　observation of its center is impossible，so researchers must_____(51)to other evidence．
2 i, J- m/ {& @4 w- e$ ~　　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)
3 s+ v! M0 _. z' o& f% S+ C$ W　　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，
$ r! s- C! l1 i　　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
- Q/ i, |% M' o. {" R" p/ ]" T　　but a_____(64)of nickel and silicon 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.
! T5 Y. P9 k' _* U4 T5 {　　51 A try B leave C turn D point
" j% f4 }' L7 k# ]$ d　　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
' f) R, q9 P' D　　55 A from B within C of D to
( S1 m+ `. Z( Q4 K; g9 z　　56 A followed B dominated C restored D opposed
　　57 A ideas B demands C phenomena D movements
: e( y6 S$ i! [6 c　　58 A things B acts C methods D records
　　59 A taken B benefited C left D kept
% j5 m: Y0 i* C% u2 _　　60 A after B before C since D when
) Q0 T6 ?1 P4 E( Y3 {0 X　　61 A expanded B modified C gained D melted
. g5 `; ]; D7 @8 s, U9 ^8 D3 L  Q　　62 A size B origin C structure D shape
0 x2 n$ F4 ~% p! L　　63 A radical B traditional C classical D conventional
2 _. T. b# N" ?! Z　　64 A system B copy C model D compound
8 T4 ~1 v  y' U& n4 S+ F  R　　65 A charge B last C experience D show