题目内容：
BigBrothersBigSistersisbasedonthesimplicityandpoweroffriendship．Itisaprogramwhichprovidesfriendshipandfunbymatchingvulnerableyoungpeople(ages7-17)withavolunteeradultwhocanbebotharolemodelandasupportivefriend.Volunteertutorscomefromallwalksoflife—married,single,withorwithoutchildren.BigBrothersandBigSistersarenotreplacementparentsorsocialworkers.Theyaretutors:someonetotrust,tohavefunwith,totalkandgotowhenneeded.
ABigSisterandLittleSisterwillgenerallyspendbetweenoneandfourhourstogetherthreeorfourtimeseachmonthforatleasttwelvemonths.Theyenjoysimpleactivitiessuchasapicnicatapark,cooking,playingsportorgoingtoafootballmatch.Theseactivitiesimprovethefriendshipandhelptheyoungpersondeveloppositiveself-respect,confidenceandlifedirection.
BigBrothersBigSistersorganizationsexistthroughouttheworld.Itisthelargeandmostwell-knownprovideroftutorservicesinternationallyandhasbeenoperatingfor25years.
EmilyandSarahhavebeenmatchedsince2008.Emilyisa10-year-oldgirlwhohasexperiencedsomedifficultiesbeingacceptedbyherschoolmatesatschool.“Iwasprettysuretherewassomethingwrongwithme.”
Emily’smumcameacrossBigBrothersBigSistersandthoughtitwouldbeofbenefittoEmilyby“providingdifferentfeedback(反馈)aboutherselfotherthanjustrelyingonschoolmatestomeasureherself-worth.
Sarahwantedtogetinvolvedinavolunteerprogram.“Igoogleditandfoundouthowtobeapartofit.Ithoughtitwouldbefunformetogetinvolvedinmakingtimetodosomethingbecausesometimesitisallworkandnoplay.”
BigBrothersBigSistershasbeenofgreatbenefitandenjoymenttobothEmilyandSarah.TheyloveandlookforwardtotheirtimetogetherandthepartnershiphascertainlyhelpedEmilybemorecomfortableinbeingthewonderful,happyanduniquegirlsheis!
WhatistheaimofBigBrothersBigSisters? A．Toofferstudentspublicservice
B．Tohelpstudentsimprovetheirgrade
C．Toorganizesportactivitiesforyoungpeopl
D．Toprovidepartnershipandfunforyoungpeopl
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