题目内容：
根据下面内容，回答题 Friendsplayanimportantpartinourdailylives,andalthoughwemaytakefriendshipforgranted,weoftendon'tclearlyunderstandhowwemakefriends.Whilewegetonwellwithanumberofpeople,weareusuallyfriendswithonlyveryfew.Inallthecasesoffriendlyrelationship,twopeoplelikeoneanotherandenjoybeingtogether,butbeyondthat,thedegreeofintimacy(亲密)betweenthemandthereasonsfortheirsharedinterestvaryenormously.Aswegettoknowpeople,wetakeintoaccountthingslikeage,race,economiccondition,socialposition,andintelligence.Althoughthesefactorsarenotofmajorimportance,itismoredifficulttogetonwithpeoplewhenthereisamarkeddifferenceinageandbackground.
Somefriendlyrelationshipcanbekeptonargumentanddiscussion,butitisusualforclosefriendstohavesimilarideasandbeliefs,tohaveattitudesandinterestsincommon--theyoftentalkabout"beingonthesamewavelength".Itgenerallytakestimetoreachthispoint.Andthemoreintimatelyinvolvedpeoplebecome,themoretheyrelyononeanother.Peoplewanttodofriendsfavorsandhatetobreakapromise.Equally,friendshavetolearntoputupwithannoyinghabitsandtotoleratedifferencesofopinions.
Incontrastwithmarriage,therearefriendshipceremoniestostrengthentheassociationbetweentwopeople.Butthesupportingandunderstandingofeachotherthatresultfromsharedexperiencesandemotionsseemstocreateapowerfulbond,whichcanovercomedifferencesinbackgroundandbreakdownbarriersofage,classorrace.
Intheauthor'sopinions,friends__________. A．arethosewhogetonwellwitheachother
B．arecloserthanthosewhojustgetonwellwitheachother
C．musttolerateeachotherwhatevertheydo
D．areonlythosewhoareinneed
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答案解析：