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LongbeforeManlivedontheEarth,therewerefishes,reptiles,birds,insects,andsomemammals.Althoughsomeoftheseanimalswereancestorsofkindslivingtoday,othersarenowextinct,thatis,theyhavenodescendantsalivenow. a^&RV5o
41Veryoccasionallytherocksshowimpressionofskin,sothat,apartfromcolor,wecanbuildupareasonablyaccuratepictureofananimalthatdiedmillionsofyearsago.Thatkindofrockinwhichtheremainsarefoundtellsusmuchaboutthenatureoftheoriginalland,oftenoftheplantsthatgrewonit,andevenofitsclimate. 3 "|A5>Vo
42Nearlyallofthefossilsthatweknowwerepreservedinrocksformedbywateraction,andmostoftheseareofanimalsthatlivedinornearwater.Thusitfollowsthattheremustbemanykindsofmammals,birds,andinsectsofwhichweknownoting.Gengduoyuanxiaowanzhengkaoboyingyuzhentijiqijiexiqinglianxiquanguomianfeizixundianhua:silinglingliuliubaliujiuqiba,huojiazixunqq:qiqierliuqibawusanqi. X(]J\?n'
43Therewerealsocrablikecreatures,whosebodieswerecovered &';@CeK
withahornysubstance.Thebodysegmentseachhadtwopairsoflegs,onepairforwalkingonthesandybottom,theotherforswimming.Theheadwasakindofshieldwithapairofcompoundeyes,oftenwiththousandsoflenses.Theywereusuallyaninchortwolongbutsomewere2feet. ?xE'i[F @
44Ofthese,theammonitesareveryinterestingandimportant.Theyhaveashellcomposedofmanychambers,eachrepresentingatemporaryhomeoftheanimal.Astheyounggrewlargeritgrewanewchamberandsealedoffthepreviousone.ThousandsofthesecanbeseenintherocksontheDorsetCoast. $BOIa
45About75millionyearsagotheAgeofReptileswasoverandmostofthegroupsdiedout.Themammalsquicklydeveloped,andwecantracetheevolutionofmanyfamiliaranimalssuchastheelephantandhorse.Manyofthelatermammalsthoughnowextinct,wereknowntoprimitivemanandwerefeaturedbyhimincavepaintingsandonbonecarvings. +J !1z
[A]Theshellfishhavealonghistoryintherockandmanydifferentkindsareknown. MR* %lZpB
[B]Nevertheless,weknowagreatdealaboutmanyofthembecausetheirbonesandshellshavebeenpreservedintherocksasfossils,fromthemwecantelltheirsizeandshape,howtheywalked,thekindoffoodtheyate. !U1V('
[C]Thefirstanimalswithtruebackboneswerethefishes,firstknownintherocksof375millionyearsago.About300millionyears ^$8WV&5q>
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agotheamphibians,theanimalsabletolivebothonlandandinwater,appeared.Theyweregiant,sometimes8feetlong,andmanyofthemlivedintheswampypoolsinwhichourcoalseam,orlayerisformed.Theamphibiansgaverisetothereptilesandfornearly150millionyearstheseweretheprincipalformsoflifeonland,inthesea,andintheair. sDy~<$l?
[D]Thebestindexfossilstendtobemarinecreatures.Theseanimalsevolvedrapidlyandspreadoverlargeoverlargeareasoftheworld. zOL*XZ0c
[E]Theearliestanimalswhoseremainshavebeenfoundwereallverysimplekindsandlivedinthesea.Laterformsaremorecomplex,andamongthesearethesealilies,relationsofthestar :-b-)*TC;
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[F]Whenananimaldies,thebody,itsbones,orshell,mayoftenbecarriedawaybystreamsintolakesortheseaandtheregetcoveredupbymud.Iftheanimallivedintheseaitsbodywouldprobablysinkandbecoveredwithmud.Moreandmoremudwouldfalluponituntilthebonesorshellbecomeembeddedandpreserved. 0h"uJco,
[G]Manyfactorscaninfluencehowfossilsarepreservedinrocks.Remainsofanorganismmaybereplacedbyminerals,dissolvedbyanacidicsolutiontoleaveonlytheirimpression,orsimplyreducedtoamorestableform. w8-L2)Q}I
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41.【解析】[B]从试题前后的语义逻辑关系来看,试题前面的一段话表明的信息是Althoughsomeoftheseanimalswereancestorsofkindslivingtoday,othersarenowextinct,thatis,theyhavenodescendantsalivenow(尽管这些动物是某些活到现在的物种的祖先,但有的动物却灭绝了,也就是说它们现在已经没有子孙后代活在这个世界上)。试题的后面的句子表明的信息是Veryoccasionallytherocksshowimpressionofskin,sothat,apartfromcolor,wecanbuildupareasonablyaccuratepictureofananimalthatdiedmillionsofyearsago(有时候这些石头可以将它们的外表展现出来,这样,除了颜色我们就可以对那些数百年前死掉的生物形成一个比较准确的印象)。从语义关系里看,前文中说动物灭绝了,暗含的意思是我们不可能得到这些动物的任何信息,而后面的句子说我们可以对这些动物形成准确的印象,因此,前后文形成了明显的对比关系,四个选项中能够表达这种关系的,只有选项[B]。 bY=Yb
本题还可以采用词汇的复现来确定正确答案,从试题后面的句子Veryoccasionallytherocksshowimpressionofskin来看,rocks的前面使用了定冠词the修饰,这表明rocks在前文中一定出现过,但我们考察第一段时发现,第一段中并没有出现关于rocks的内容,因此可以确定,关于rocks的内容一定出现在要填入的试题中。选项[B]Nevertheless,weknowagreatdealaboutmanyofthembecausetheirbonesandshellshavebeenpreservedintherocksasfossils.Fromthemwecantelltheirsizeandshape,howtheywalked,thekindoffoodtheyate中出现了动物的骨骼被保存在therocks中,变成化石的论述,由此可以判断选项[B]是正确答案。 h&IF?h
42.【解析】[F]本题出现在一个段落的首句,从答题策略来看,应当重 k%({<