题目内容：
根据以下材料，回答题Candogsandcatsliveinperfectharmonyinthesamehome?Peoplewhoarethinkingaboutadoptingadogasafriendfortheircatsareworriedthattheywillfight.Arecentresearchhasfoundanewrecipeofsuccess.Accordingtothestudy,ifthecatisadoptedbeforethedog,andiftheyareintroducedwhenstillyoung(lessthan6monthsforcats,ayearfordogs),itishighly
probablethatthetwopetswillgetalongswimmingly.Two-thirdsofthehomesinterviewedreportedapositiverelationshipbetweentheircatanddog.
However,itwasn'tallsweetnessandlight.Therewasareportedcoldnessbetweenthecatanddogin25%ofthehomes,whileaggressionandfightingwereobservedin10%ofthehomes.Onereasonforthisisprobablythatsomeoftheirbodysignalsarejustopposite.Forexample,whenacatturnsitsheadawayitsignalsaggression,whileadogdoingthesamesignalssubmission.
Inhomeswithcatsanddogslivingpeacefully,researchersobservedasurprisingbehavior.Theyarelearninghowtotalkeachother'slanguage.Itisasurprisethatcatscanlearnhowtotalk"Dog",anddogscanlearnhowtotalk"Cat".
What'sinterestingisthatbothcatsanddogshaveappearedtodeveloptheirintelligence.Theycanlearnhowtoreadeachother'sbodysignals,suggestingthatthetwomayhavemoreincom-monthanwepreviouslysuspected.Oncefamiliarwitheachother'spresenceandbodylanguage,catsanddogscanplaytogether,greeteachothernosetonose,andenjoysleepingtogetheronthesofa.Theycaneasilysharethesamewaterbowlandinsomecasesgroom(梳理)eachother.
Thesignificanceoftheresearchoncatsanddogsmaygobeyondpets--topeoplewhodon'tgetalong,includingneighbors,colleaguesatwork,andevenworldsuperpowers.Ifcatsanddogscanlearntogetalong,surelypeoplehaveagoodchance.
TheunderlinedwordswimminglyinParagraph1isclosestinmeaningto A．early
B．sweedy
C．quickly
D．smoothly
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