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9.
A.recently      B.affects      C.pattern      D.varied   E.floats
F.warm        G.regularly    H.mysterious   I.effect    J.evidence
Big climate changes in the last million years might have come from something very small dust from outer space.
Earth changes between ice ages and warm periods in a(n) (41)Cthat includes several cycles,including a (42)H one that lasts 100,000years.Scientists (43)Asuggested this cycle might be due to changes in the inflow of cosmic(宇宙) dust.
The idea is that Earth (44)Eabove and below the imaginary planet that runs through the sun and Jupiter(木星),completing a cycle every 100,000years.So maybe it encounters (45)Gvarying amounts of dust during each cycle that produce the climate trend.
Now there is some (46)J,from ancient cosmic dust recovered in ocean-floor drilling near the Azores islands west of Portugal.The large quantity of the dust rises and falls with a wonderful 100,000year cycle during the period analyzed,253,000years to 458,000years ago.Periods of more dust are related to(47)F climates.
But that is a long way from showing that the dust (48)Bclimate.Some scientists argue that it is not clear how cosmic dust would make the climate warmer while dust from volcanoes is known to make it cooler.They say the cosmic dust is so thin that it is hard to see how it could have any climate(49)I.
Nevertheless,the new study shows scientists have to take the cosmic dust idea seriously.

分析 本文介绍了地质专家的最新发现,在过去的几百万年前的天气巨变有可能来自于太空外的非常微小的灰尘的流动.这些新的研究需要科学家们严肃对待宇宙灰尘理论的存在及影响.

解答 CHAEGJFBI
41.C.考查名词.地球在冰川时代和次暖期时代间的以一种多循环的模式变化着.前面有冠词修饰,所以后面应该是名词的形式,根据后面的定语that includes several cycles可知,应该是pattern;故选C.
42.H.考查形容词.本空应该是和前面的冠词a一起充当定语,修饰代词one(cycle),所以应该是形容词,由后面的定语从句that lasts 100,000years可知,指的是神秘的循环;故选H.
43.A.考查副词.本句应该是用来修饰动词suggested的副词,应该是最近专家提出的建议;故选A.
44.E.考查动词.该空应该是that引导的表语从句中的谓语动词,即地球漂浮在一个想象中的星球上;故选E.
45.G.考查副词.此处是用来修饰动词encounters的一个副词,所以用regularly表示经常会遇到大量悬浮的灰尘颗粒;故选G.
46.J.考查名词.本句中后面列举的都是一些新发现的证据,即evidence.
47.F.考查形容词.随着时间的推移,这些悬浮物的存在是与温暖的气候相关的;故选F.
48.B.考查动词.本段描述的是灰尘影响气候的理论还是有待于进一步证实的;所以用动词作谓语动词,用一般现在时;故选B.
49.I.考查名词.此处强调的是气候的影响;宇宙灰尘是如此的稀薄以至于难以断定其对气候的影响;故用名词,故选I.

点评 在做十选九的选词填空题时,很重要的一点就是要确认空格处所要填的词的词性,然后根据句子的语法规则,也是就是句法来判断所要填的词.

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