题目内容：
根据以下材料，回答题"Hithere.How'sitgoing?""Oh,fine.Fine.Howaboutthisweather,huh?""Well,Iguesswecanalwayusetherain."Whatisthat?Thisstory?Oh,justalittlelookatsmalltalk.Youknow,thoseseeminglymeaninglessconversationsyouhavedozensoftimesaday.Maybeyou'rewaitingfortheelevator,orinalineatthebank.Itallseems
prettytrivial.Idlechatterabouttrafficdoesn'tdomuchmorethanfilltheairwithemptywordsthatarequicklyforgotten.Butyoushouldknowthatsmalltalkactuallyhasabigplaceinourlives.
PatOliver,assistantprofessoronarts,saysthat,"Leftunchecked,smalltalkcanbeaninvasion.It'ssopowerful.Itdoessomethingtoyou.""Everymorningafterspendinganhourandahalfonthe
freewayIstartthedaywithsmalltalkwithmysecretary,"Oliversays,"IfIdon'tmakesmallconnectionwithanotherperson,Ican'twork."
Whatcausesit?Asarule,you'reeithertryingtoforcesomethingintoyourlife,oryou'reusingconversationasaninvisibleforcefieldtokeepthemout.Youcanbewantingtoconnectwithanotherperson,and
smalltalkisyourintroductiontomoremeaningconversation.Thewaypeopleusesmalltalkisusuallydeterminedbywheretheyhappentobeatthetime.
Taketheelevator,forinstance.Nowthere'sprimeterritory.Nobodyknowsanyoneandthere'snoreasontostartaconversation,butinvariably,someonedoes."Makingconversationinsuch
peacefulsocialsettings,"accordingtoOliver,"canconfirmyourterritory.It'sawayoffeelinglikedandaccepted."
Thetopicsofsmalltalkdon'tmatter.Infact,youdon'twantanythingmoretaxingthantheweatherorthetraffic.It'snon-threateningtalkinathreateningsituation.However,theruleschangequicklywhenyou'rewithlotsofpeopledoinglotsoftalking.Let'ssayyou'reataparty.Nowit'stimetousesmalltalkasaway
ofmakingothersfeelmorecomfortablearoundyou,sodon'tlooksillystandingbythefoodtablealoneallnight.
"Smalltalk",asinterpretedbytheauthor, A．hasnorealfunctionincommunicationatall
B．isusuallymeaninglessandthereforeuseless
C．isnotasidleasitmayseemtobe
D．isrestrictedtocertaintopicsonly
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答案解析：