托福阅读第二讲。包括句子的主要成分和主要的逻辑关系。长难句各个成分的识别:.定语从句Overlongperiodsoftime,substanceswhosephysicalandchemicalpropertieschangewiththeambientclimateatthetimecanbedepositedinasystematicwaytoprovideacontinuousrecordofchangesinthosepropertiesovertime,sometimesforhundredsorthousandsofyears..mercialexpansionatseareflectstheimmensityoftheprofitsthatsuchEast-Westtradecouldcreate..eburiedbysoil;iftheyarenowbelowthewater’suppersurface(thewatertable),thegravelsandsandsoftheformerriverbed,anditssandbars,willbesaturatedwithgroundwater..名词性从句Oneofthemostdifficultaspectsofdecidingwhethercurrentclimaticeventsrevealevidenceoftheimpactofhumanactivitiesisthatitishardtogetameasureofwhatconstitutesthenaturalvariabilityoftheclimate..名词性从句WesternFarmersborrowedwiththeconfidentexpectationthattheexpandingeconomywouldkeepfarmpriceshigh,thusmakingiteasytorepayloanswhentheyfelldue..状语从句Inorderforthestructuretoachievethesizeandstrengthnecessarytomeetitspurpose,architectureemploysmethodsofsupportthat,becausetheyarebasedonphysicallaws,havechangedlittlesincepeoplefirstdiscoveredthem—evenwhilebuildingmaterialshavechangeddramatically..状语从句Immediatelyadjacenttothetimberline,pletecoveroflow-lyingshrubs,herbs,andgrasses,asionalmossesandlichensandsomeprostratecushionplants..
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