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。
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.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)
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,
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
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.
51 a try b leave c turn d point
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
55 a from b within c of d to
56 a followed b dominated c restored d opposed
57 a ideas b demands c phenomena d movements
58 a things b acts c methods d records
59 a taken b benefited c left d kept
60 a after b before c since d when
61 a expanded b modified c gained d melted
62 a size b origin c structure d shape
63 a radical b traditional c classical d conventional
64 a system b copy c model d compound
65 a charge b last c experience d show
2005年 职称 英语等级考试理工类(a级)答案
满分100分,其中
1一15每题1分;
16—30每题1分;
31—45每题3分0
46—50每题2分0
51—65每题i分。
1.a 2.c 3.c 4.d 5.b
6.a 7.a 8.b 9.d 10.b
11.d 12 a 13.c 14.b 15.a
16.a 17.c 18.a 19.c 20.a
21.b 22.b 23.d 24.a 25.e
26.b 27.c 28.f 29.d 30.b
31.d 32.a 33.c 34.b 35.d
36.a 37.c 38.d 39.b 40 c
41.b 42.c 43.d 44.a 45.c
46.e 47.d 48.a 49.f 50.c
51.c 52.a 53.d 54.b 55.c
56.b 57.a 58.d 59.c 60.a
61.c 62.b 63.a 64.d 65.c