题目内容：
根据以下材料，回答题 ResearchShowsWalkingCanLiftDepression
NewresearchbyGermanscientistsshowsthatauthorCharlesDickenswasontoagoodthingwhenhetooklong,briskwalkstorelieveperiodicboutsofdepression．TheauthorofOliverTwistandDavidCopperfieldwouldwalkforhoursinthe1860sasanantidotetointensefeelingsofsadnesswhichalternatedwithrestlesseuphoria．（46）
Aerobicexerciselikerapidwalkingcanbemoreeffectiveatliftingdepressionthandrugs,reportedthescientistsledbyDr．FernandoDimeo．（47）Theteamfoundthatin10ofthesepatientsdrugshadfailedtobringanysubstantialimprovement．Theteamdevisedanexerciseregimeforthegroupthatinvolvedwalkingonatreadmillfor30minuteseveryday．（48）Theintensityofthetrainingprogrammewassteppedupastheheartrateadapted．Ameasurementofdepressionseveritywastakenatthestartandtheendoftheprogramme,andpatientswereaskedtoratetheirownmoodregularlyovera10-dayperiod．TheresearchersinBerlinfoundthatafter10daysofthecoursesixpatientsfelt"substantiallylessdepressed"．（49）Twowereslightlylessdepressed,whilefourothersremainedunchanged．Depressionlevelsoverallfellbyathirdandontheself-assessedscoresby25percent,saidtheresearcherswhosefindingsappearedintheBritishJournalofSportsMedicine.
Thestudywassmallbuttheextentoftheimprovementwassaidbyscientiststobeimpressive. （50）NineteenthcenturydoctorswouldhavecalledDickens'sconditionmelancholiasincethepsychologicalconditionofdepressionwasunknown．Dickens'biographerPeterAckroydsaystheauthor'ssonCharlesremembershisfather's"heavymoodsofdeepdepression"andmanytimesof"intensenervousirritability",somethingmodempsychologistswouldcertainlyrecognize.
回答(46)题 A．Thenumberincludedfivewhohadnotfoundanyreliefusingdrugtreatment.
B．Longandbriskwalksarenotnecessarilybeneficialtoeveryperson.
C．Theystudied12peoplewithseveredepressionthathadlastedanaverageofninemonths.
D．Theoutcomeindicatedaclinicalbenefitwhichcouldnotbeobtainedwithpharmacologicaltreatmentcurrentlyavailable,theysaid.
E．ThisisalsotheadvicethatexpertsfromtheFreeUniversityinBerlinaregivingtoday.
F．Accordingtotheregime,intenseactivitylastingthreeminuteswasalternatedwithwalkingathalfspeedforthreeminutes.
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