资源描述：
《题新东方网络课堂总结》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、精品文档63题新东方网络课堂总结1063题新东方网络课堂总结10“Passage26问题解决型(专业性科学文章)提出四个标准--提出问题Inchoosingamethodfordeterminingclimaticconditionsthatexistedinthepast,paleoclimatologistsinvokefourprincipalcriteria*2C.First,thematerial-rocks,lakes,vegetation,etc.-onwhichthemethodrel
2、iesmustbewidespread*7enoughtoprovideplentyofinformation,since(小原因,可以暂时不看)analysisofmaterialthatisrarelyencounteredwillnotpermitcorrelationwithotherregionsorwithotherperiods*7ofgeologicalhistory.Second,intheprocessofformation,thematerialmusthavereceiveda
3、nenvironmentalsignalthatreflectsachangeinclimateandthatcanbedeciphered破译,解码bymodernphysicalorchemicalmeans.Third,atleastsomeofthematerialmusthaveretainedthesignal*6unaffectedbysubsequentchangesintheenvironment*6D.Fourth,itmustbepossibletodeterminethetim
4、eatwhichtheinferredclimaticconditionsheld.Thislastcriterionismoreeasily(比较句,很可能出题)metindatingmarinesediments*1,2016全新精品资料-全新公文范文-全程指导写作–独家原创10/10精品文档because(小原因,暂时不用看)datingofonlyasmallnumberoflayersinamarinesequenceallowstheageofotherlayerstobeestimate
5、dfairlyreliablybyextrapolationandinterpolation.Bycontrast(强对比,一定要看),because(小原因,暂时不用看,看后半句)sedimentationismuchlesscontinuous*1Eincontinentalregions*1,estimatingtheageofacontinentalbedfromtheknownagesofbedsaboveandbelowismorerisky.解决方案一:古代湖泊水位法Oneveryold
6、(大-)method*2Cusedintheinvestigationofpastclimaticconditionsinvolvesthemeasurementofwaterlevelsinancientlakes.原因一Intemperateregions温带地区,thereareenoughlakesforcorrelationsbetweenthemtogiveusareliable(小+,由于前面有大,所以后面一定有转折)picture.Inaridandsemiaridregions,on
7、theotherhand(转折),thesmallnumberoflakesandthegreatdistancesbetweenthemreducethepossibilitiesforcorrelation.原因二Moreover(大列举的非第一点),sincelakelevelsarecontrolledbyratesofevaporationaswellas(强调前者)byprecipitation降水,theinterpretationofsuchlevelsisambiguous*5B(-
8、).2016全新精品资料-全新公文范文-全程指导写作–独家原创10/10精品文档Forinstance(与结论紧密相连,篇幅小,可以暂时不看),thefactthatlakelevelsinthesemiaridsouthwesternUnitedStates*5appeartohavebeenhigherduringthelasticeagethantheyarenowwasatonetimeattributedtoincreasedprecipita
