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1、1,Howdidthistremendousdevelopmenttakeplace,andwhydidithappenintheTeotihuacánValley?AmongthemainfactorsareTeotihuacán’sgeographiclocationonanaturaltraderoutetothesouthandeastoftheValleyofMexico,theobsidianresourcesintheTeotihuacánValleyitself,andthevalley’spotentialforextensiveirrigation灌溉冲洗.Theexac
2、troleofotherfactorsismuchmoredifficulttopinpoint―forinstance,Teotihuacán’sreligioussignificanceasashrine圣地,thehistoricalsituationinandaroundtheValleyofMexicotowardtheendofthefirstmillenniumB.C.,theingenuityandforesightednessofTeotihuacán’selite,and,finally,theimpactofnaturaldisasters,suchasthevolca
3、niceruptions火山喷发ofthelatefirstmillenniumB.C.如此惊人的发展是如何产生的，它为什么发生在Teotihuacán山谷？主要因素有：Teotihuacán地理位置处于到墨西哥谷东南部的天然商路上；Teotihuacán谷本身的黑曜石资源；山谷的大量灌溉的潜力。要想说清楚其他因素所扮演的角色就难的多了——比如，Teotihuacán作为圣地的宗教意义；墨西哥谷及周边直到公元前第一个千年的历史情况；Teotihuacán精英阶层的3远见；最后还有自然灾害的影响，诸如公元前一千年的火山喷发。Whichofthefollowingcanbeinferredfro
4、mparagraphs2and3abouttheVolcaniceruptionsofthelatefirstmillenniumB.C.?以volcaniceruptionsofthelatefirsrmillenniumB.C.○Theyweremorefrequentthanhistoriansoncethought.○TheymayhavedonemoredamagetoTeotihuacánthantoneighboringcenters.○TheymayhaveplayedamajorroleintheriseofTeotihuacán.○Theyincreasedtheneed
5、forextensiveirrigationintheTeotihuacánValley做关键词定位至第二段最后一句，这个是诸多factor当中的一个，而这些factor都是促进T城发展的，所以答案是C。也可以排除法，A无相关信息；第三段第三句说火山对T影响很大，没跟其他的比较，B错；第二段第二句说到了irrigation，但与问题无关，错ThislastfactorisatleastcircumstantiallyimplicatedinTeotihuacán’srise.Priorto200B.C.,anumberofrelativelysmallcenterscoexistedinan
6、dneartheValleyofMexico.Aroundthistime,thelargestofthesecenters,Cuicuilco,wasseriouslyaffectedbyavolcaniceruption,withmuchofitsagriculturallandcoveredbylava.WithCuicuilcoeliminatedasapotentialrival,anyoneofanumberofrelativelymodesttownsmighthaveemergedasaleadingeconomicandpoliticalpowerinCentralMexi
7、co.Thearchaeologicalevidenceclearlyindicates,though,thatTeotiluacanwasthecenterthatdidariseasthepredominantforceintheareabythefirstcenturyA.D.最后一个因素至少从环境上与Teotihuacán古城的崛起有牵连。在公元前200年之前，有很多相对的小的中心共存于墨西哥谷及附近
