Regularchildcareprovidedoutsidehomeorbysomeoneotherthanthemotherdoesnotinitselfundermine（削弱）healthyemotionalconnectionsbetweenmothersandtheir15-month-oldinfants（幼儿）accordingtoalong-termnationalstudy．Thefindingholdsevenifcarebeginsduringthefirst3monthsafterbirthandrunsfor30hoursormoreperweek．

Amonginfantswhoreceiveunkindandunresponsivecarefromtheirmothershoweverthemother-carerelationshipmaybedamaged．"Thisresearchhelpsusputapartcomplexitiesregardingchildcarethathavenotpreviouslybeenstudiedindetail"contends（主张）JayBelskyapsychologistatPennsylvaniaStateUniversity．Belskyandseveralofhiscolleaguesannouncedtheirfindingslastweekattheinternationalconference．

Theinvestigationconsistsof1153childrenandtheirfamilieslivinginornearBoston．Theyoungstersnomorethan1montholdwhenenteredthestudyin1991willbetrackeduntiltheageof7．Experimentersgavequestionnairestomothersintheirhomesandvideotapedbabycaretaker’sinteractingwiththekidsatages16and15months．Independentobserversratedthequalityofeachchildcareeffortsandnotedinfantnervousness．Unlikemostpreviousstudiesthisoneallowsresearcherstoobserveeachcaretaker’spersonalityatchildnursingandkid’semotionalreactionbytheequipment．Aftertakingfamilyfactorsintoconsiderationotherpsychologistsstatethattheresearchersfoundnorelationbetweenthequalityofchildcareandinfant’sresponse．Buttheexperimenterscontendthattheboyswhospentmorethan30hoursperweekinchildcareexhibitedmoreemotionfortheirmothersthanotherboyswhodidn’tandthegirlswhospentthesamehoursperweekinchildcareshowedamodest（适度的）riseinthisemotion．Thereforequalityofchildcareoutsidehomeplaysanimportantroleintheconnectionbetweenmothersandinfants．

55．Fromthefirstparagraphweknowthat_____．

A．mothercareisthebestaccordingtoanationalstudy

B．childcareoutsidehomeisthebestinaccordancewiththestudy

C．regularchildcareoutsidehomemayplayaroleasamother

D．connectionsbetweenmothersandinfantsaredamagedbyoutsidecare

56．Accordingtothepassageunresponsi