阅读真题精讲入门难度6篇电子讲义老托福1995 10 p

Question1-Paragraph1Atmosphericpressurecansupportacolumnofwaterupto10metershigh.But ntscanmovewatermuchhigher,thesequoiatreecanpumpwatertoitsverytop,morethan100metersabovetheground.Untiltheendofthenineteenthcentury,themovementofwaterintreesandothertall ntswasamystery.Somebotanistshypothesizedthatthelivingcellsof ntsactedaspumps,Butmanyexperimentsdemonstratedhatthestemsof ntsinwhichallthecellsarekilledcanstillmovewatertoappreciableheights.Otherex nationsforthemovementofwaterin ntshavebeenbasedonrootpressure,apushonthewaterfromtherootsatthebottomofthe nt.Butrootpressureisnotnearlygreatenoughtopushwatertothetopsoftalltrees.Furthermore,theconifers,whichareamongthetallesttrees,haveunusuallylowrootpressures.Paragraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.Thepullonarisingcolumnofwaterina ntresultsfromtheevaporationofwateratthetopof nt.Aswaterislostfromthesurfaceoftheleaves,anegativepressure,ortension,iscreated.Theevaporatedwaterisre cedbywatermovingfrominsidethe ntinunbrokencolumnsthatextendfromthetopofa nttoitsroots.Thesame sthatcreatesurfacetensioninanysampleofwaterareresponsibleforthemaintenanceoftheseunbrokencolumnsofwater.Whenwaterisconfinedintubesofverysmallbore,thesofcohesion(theattractionbetweenwatermolecules)aresogreatthatthestrengthofacolumnofwatercompareswiththestrengthofasteelwireofthesamediameter.ThiscohesivestrengthpermitscolumnswatertobepulledtogreatheightswithoutbeingParagraph1Atmosphericpressurecansupportacolumnofwaterupto10metershigh.Butntscanmovewatermuchhigher,thesequoiatreecanpumpwatertoitsverytop,morethan100metersabovetheground.Untiltheendofthenineteenthcentury,themovementofwaterintreesandothertall ntswasamystery.Somebotanistshypothesizedthatthelivingcellsofntsactedaspumps,Butmanyexperimentsdemonstratedhatthestemsof ntsinwhichallthecellsarekilledcanstillmovewatertoappreciable heights.Otherex nationsforthemovementofwaterin ntshavebeenbasedonrootpressure,apushonthewaterfromtheatthebottomofthent.Paragraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.…Howmanytheoriesdoestheauthor

正确答案：Paragraph1Atmosphericpressurecansupportacolumnofwaterupto10metershigh.Butntscanmovewatermuchhigher,thesequoiatreecanpumpwatertoitsverytop,morethan100metersabovetheground.Untiltheendofthenineteenthcentury,themovementofwaterintreesandothertall ntswasamystery.Somebotanistshypothesizedthatthelivingcellsofntsactedaspumps,Butmanyexperimentsdemonstratedhatthestemsof ntsinwhichallthecellsarekilledcanstillmovewatertoappreciable heights.Otherex nationsforthemovementofwater ntshavebeenbasedonrootpressure,apushonthewaterfromtheatthebottomofthent.Paragraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.…ThepassageanswerswhichofthefollowingWhatistheeffectofatmosphericpressureonWhendodeadcellsharmntHowdoeswatergettothetopsofWhyisrootpressure

正确答案：Paragraph1Atmosphericpressurecansupportacolumnofwaterupto10metershigh.Butntscanmovewatermuchhigher,thesequoiatreecanpumpwatertoitsverytop,morethan100metersabovetheground.Untiltheendofthenineteenthcentury,themovementofwaterintreesandothertallntswasamystery.Somebotanistshypothesizedthatthelivingcellsofntsactedaspumps,Butmanyexperimentsdemonstratedthatthestemsofntsinwhichallthecellsarekilledcanstillmovewatertoappreciableheights.Otherexnationsforthemovementofwaterinntshavebeenbasedonrootpressure,apushonthewaterfromtherootsatthebottomofthent.Butrootpressureisnotnearlygreatenoughtopushwatertothetopsoftalltrees.Furthermore,theconifers,whichareamongthetallesttrees,haveunusuallylowrootpressures.Theword"demonstrated"inline5isclosestinmeaning

正确答案：Paragraph1Atmosphericpressurecansupportacolumnofwaterupto10metershigh.Butntscanmovewatermuchhigher,thesequoiatreecanpumpwatertoitsverytop,morethan100metersabovetheground.Untiltheendofthenineteenthcentury,themovementofwaterintreesandothertallntswasamystery.Somebotanistshypothesizedthatthelivingcellsofntsactedaspumps.Butmanyexperimentsdemonstratedthatthestemsofntsinwhichallthecellsarekilledcanstillmovewatertoappreciableheights.Otherexnationsforthemovementofwaterinntshavebeenbasedonrootpressure,apushonthewaterfromtherootsatthebottomofthent.Butrootpressureisnotnearlygreatenoughtopushwatertothetopsoftalltrees.Furthermore,theconifers,whichareamongthetallesttrees,haveunusuallylowrootpressures.WhatdotheexperimentsmentionedntstemsdiewhendeprivedofCellsinntstemsdonotpumpntscannotmovewatertohighntcellsregulatepressurewithin

正确答案：Paragraph1Atmosphericpressurecansupportacolumnofwaterupto10metershigh.Butntscanmovewatermuchhigher,thesequoiatreecanpumpwatertoitsverytop,morethan100metersabovetheground.Untiltheendofthenineteenthcentury,themovementofwaterintreesandothertallntswasamystery.Somebotanistshypothesizedthatthelivingcellsofntsactedaspumps.Butmanyexperimentsdemonstratedthatthestemsofntsinwhichallthecellsarekilledcanstillmovewatertoappreciableheights.Otherexnationsforthemovementofwaterinntshavebeenbasedonrootpressure,apushonthewaterfromtherootsatthebottomofthent.Butrootpressureisnotnearlygreatenoughtopushwatertothetopsoftalltrees.Furthermore,theconifers,whichareamongthetallesttrees,haveunusuallylowrootpressures.Howdobotanistsknowthatrootpressureisnottheonlythatmoveswaterinnts?SomeverytalltreeshaveweakrootRootpressuresdecreaseinntscanliveaftertheirroots

正确答案：Waterinant'srootsisnotconnectedtowaterinitsParagraph1Atmosphericpressurecansupportacolumnofwaterupto10metershigh.Butntscanmovewatermuchhigher,thesequoiatreecanpumpwatertoitsverytop,morethan100metersabovetheground.Untiltheendofthenineteenthcentury,themovementofwaterintreesandothertall ntswasamystery.Somebotanistshypothesizedthatthelivingcellsofntsactedaspumps,Butmanyexperimentsdemonstratedhatthestemsof ntsinwhichallthecellsarekilledcanstillmovewatertoappreciable heights.Otherex nationsforthemovementofwaterin ntshavebeenbasedonrootpressure,apushonthewaterfromtheatthebottomofthent.Paragraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.…Thiscohesivestrengthpermitscolumnsofwatertobepulledtogreatheightswithoutbeingbroken.WhichofthefollowingstatementsdoesthepassageWaterispushedtothetopsofBotanistshaveproventhatlivingcellsactasAtmosphericpressuredrawswatertothetopsoftall

正确答案：BotanistshavechangedtheirtheoriesofhowwatermovesinParagraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.Thepullonarisingcolumnofwaterina ntresultsfromtheevaporationofwateratthetopofthe nt.Aswaterislostfromthesurfaceoftheleaves,anegativepressure,ortension,iscreated.Theevaporatedwaterisre cedbywatermovingfrominsidethe ntinunbrokencolumnsthatextendfromthetopofa nttoitsroots.Thesamesthatcreatesurfacetensioninanysampleofwaterareresponsibleforthemaintenanceoftheseunbrokencolumnsofwater.Whenwaterisconfinedintubesofverysmallbore,the sofcohesion(theattractionbetweenwatermolecules)aresogreatthatthestrengthofacolumnofwatercompareswiththestrengthofasteelwireofthesamediameter.ThiscohesivepermitscolumnsofwatertobepulledtogreatheightswithoutbeingTheword"it"referscohesion-tension

正确答案：Paragraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.Thepullonarisingcolumnofwaterina ntresultsfromtheevaporationofwateratthetopofthe nt.Aswaterislostfromthesurfaceoftheleaves,anegativepressure,ortension,iscreated.Theevaporatedwaterisre cedbywatermovingfrominsidethe ntinunbrokencolumnsthatextendfromthetopofa nttoitsroots.Thesamesthatcreatesurfacetensioninanysampleofwaterareresponsibleforthemaintenanceoftheseunbrokencolumnsofwater.Whenwaterisconfinedintubesofverysmallbore,the sofcohesion(theattractionbetweenwatermolecules)aresogreatthatthestrengthofacolumnofwatercompareswiththestrengthofasteelwireofthesamediameter.ThiscohesivestrengthpermitscolumnsofwatertobepulledtogreatheightswithoutbeingTheword"there"inline10referswater

正确答案：Paragraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.Thepullonarisingcolumnofwaterina ntresultsfromtheevaporationofwateratthetopofthe nt.Aswaterislostfromthesurfaceoftheleaves,anegativepressure,ortension,iscreated.Theevaporatedwaterisre cedbywatermovingfrominsidethe ntinunbrokencolumnsthatextendfromthetopofa nttoitsroots.Thesamesthatcreatesurfacetensioninanysampleofwaterareresponsibleforthemaintenanceoftheseunbrokencolumnsofwater.Whenwaterisconfinedintubesofverysmallbore,the sofcohesion(theattractionbetweenwatermolecules)aresogreatthatthestrengthofacolumnofwatercompareswiththestrengthofasteelwireofthesamediameter.ThiscohesivestrengthpermitscolumnsofwatertobepulledtogreatheightswithoutbeingWhatcausesthetensionthatdrawswaterupantRoot

正确答案：Paragraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.Thepullonarisingcolumnofwaterina ntresultsfromtheevaporationofwateratthetopofthe nt.Aswaterislostfromthesurfaceoftheleaves,anegativepressure,ortension,iscreated.Theevaporatedwaterisre cedbywatermovingfrominsidethe ntinunbrokencolumnsthatextendfromthetopofa nttoitsroots.Thesamesthatcreatesurfacetensioninanysampleofwaterareresponsibleforthemaintenanceoftheseunbrokencolumnsofwater.Whenwaterisconfinedintubesofverysmallbore,the sofcohesion(theattractionbetweenwatermolecules)aresogreatthatthestrengthofacolumnofwatercompareswiththestrengthofasteelwireofthesamediameter.ThiscohesivestrengthpermitscolumnsofwatertobepulledtogreatheightswithoutbeingTheword"extend"inline13isclosestinmeaning

正确答案：Paragraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.Thepullonarisingcolumnofwaterina ntresultsfromtheevaporationofwateratthetopofthe nt.Aswaterislostfromthesurfaceoftheleaves,anegativepressure,ortension,iscreated.Theevaporatedwaterisre cedbywatermovingfrominsidethe ntinunbrokencolumnsthatextendfromthetopofa nttoitsroots.Thesamesthatcreatesurfacetensioninanysampleofwaterareresponsibleforthemaintenanceoftheseunbrokencolumnsofwater.Whenwaterisconfinedintubesofverysmallbore,the sofcohesion(theattractionbetweenwatermolecules)aresogreatthatthestrengthofacolumnofwatercompareswiththestrengthofasteelwireofthesamediameter.Thiscohesivestrengthpermitscolumnsofwatertobepulledtogreatheightswithoutbeing thepassage, whydoes throughntsinunbrokencolumns?RootpressuremovesthewaterveryTheattractionbetweenwatermoleculesin

正确答案：ThelivingcellsofntspushthewatermoleculesAtmosphericpressuresupportstheParagraph2Ifwaterisnotpumpedtothetopofatalltree,andifitisnotpushedtothetopofatalltree,thenwemayask,Howdoesitgetthere?Accordingtothecurrentlyacceptedcohesion-tensiontheory,waterispulledthere.Thepullonarisingcolumnofwaterina ntresultsfromtheevaporationofwateratthetopofthe nt.Aswaterislostfromthesurfaceoftheleaves,anegativepressure,ortension,iscreated.Theevaporatedwaterisre cedbywatermovingfrominsidethe ntinunbrokencolumnsthatextendfromthetopofa nttoitsroots.Thesamesthatcreatesurfac