《阅读理解解题技巧》进阶练习（三）-1

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1、《阅读理解解题技巧》进阶练习I.阅读理解ADoesexercisestrengthenyourbrainwhileitbuildsmuscle?Tolearnmoreabouthowexerciseaffectsthebrain，scientistsinIrelandrecentlyaskedagroupofsedentary(久坐的)malecollegestudentstotakepartinamemorytestfollowedbystrenuous(紧张的)exercise.First，theyoungmenwatchedarapid—firelineupofphot

2、oswiththefacesandnamesofstrangers.Afterabreak，theytriedtorecallthenamestheyhadjustseenasthephotosagainmovedquicklyacrossacomputerscreen.Afterward，halfofthestudentsrodeabicycle，atanincreasinglystrenuouspace，untiltheywereexhausted.Theotherssatquietlyfor30minutes.Thenbothgroupstookthebrain-tea

3、sertestagain.Notably,theexercisedvolunteersperformedsignificantlybetteronthememorytestthantheyhadontheirfirsttry.whilethevolunteerswhohadresteddidnotimprove.Meanwhile,bloodsamplestakenthroughouttheexperimentofferedabiologicalexplanationfortheincreaseinmemoryamongtheexercisers.Immediatelyaft

4、erthestrenuousactivity，thecyclistshadsignificantlyhigherlevelsofaproteinknownasBDNF，whichistopromotethehealthofnervecells.ThemenwhohadsatquietlyshowednocomparablechangeinBDNFlevels.Forsometime.scientistshavebelievedthatBDNFhelpsexplainwhymentalfunctioningappearstoimprovewithexercise.However

5、，theyhaven’tfullyunderstoodwhichpartsofthebrainareaffectedorhowthoseeffectsinfluencethinking.TheIrishstudysuggeststhattheincreasesinBDNFcausedbyexercisemayplayaparticularroleinimprovingmemoryandrecall.Othernewstudieshavereachedsimilarconclusions，amongbothpeopleandanimals，youngandold.Inonein

6、terestingexperimentpublishedlastmonth,Brazilianscientistsfoundthataftersedentaryelderlyratsranforamerefiveminutesorsoseveraldaysaweekforfiveweeks.anincreaseofbiochemicalprocessesappearedinthememorycenteroftheirbrains，resuminginincreasedproductionofBDNFthere.Theold，exercisedanimalsthenperfor

7、medalmostaswellasmuchyoungerratsoilmemorytests.1.Thebrain-teasertestshowsthat_______.A.agoodrestcanimproveone’smemoryB.toomuchexercisecanslowdownone’smemoryC.exercisecanimproveone’smemoryD.cyclistsusuallyhavebettermemory2.WhatisthefunctionoftheBDNF?A.Toi