题目内容：
Questionsarebasedonthefollowingpassage. "Thereisasenselessnotionthatchildrengrowupandleavehomewhenthey're18,andthetruthisfarfromthat,"sayssociologistLarryBumpassoftheUniversityofWisconsin.Today,unexpectednumbersofyoungadultsarelivingwiththeirparents,"Thereisamajorshiftinthemiddleclass,"declaressociologistAllanSchnaibergofNorthwesterUniversity,whoseson,19,movedbackinafteranabsenceofeightmonths.
Analystsciteavarietyofreasonsforthisreturntothenest．Themarriageageisrising,aconditionthatmakeshomeanditspleasantnessparticularlyattractivetoyoungpeople．Ahighdivorcerateandadecliningremarriageratearesendingeconomicallypressedandemotionallyhurtsurvivorsbacktoparentalshelters．Forsome,theexpenseofanaway-from-homecollegeeducationhasbecomesoexcessivelygreatthatmanystudentsnowattendlocalschools,Evcnaftergraduation,youngpeoplefindtheirwingsclippedbyskyrocketinghousingcosts.
Livingathome,saysKnighton,aschoolteacher,continuestogivehersecurityandmoralsupport．Hermotheragreed,"It'sridiculousforthekidstopayallthatmoneyforrent．Itmakessenseforkidstostayathome."Butsharingthefamilyhomerequiresadjustmentsforall．Thcrcarcthehasslesoverbathrooms,telephonesandprivacy．Somefamilies,however,managethedclicatcbalancingact．Butforothers,itprovestoodifficult．MichcllcDclTurco,24,hasbccnhomethreetimes-andleftthreetimes．"WhatIconsideredasocialdrink,mydadconsideredanalcoholproblem,"shecxplains．“HcneverlikcdanyoneIdatcd,soIcithcrhadtohideawayormcctthematfricnds'house."Justhowlongshouldadultchildrenlivewiththeirparentsbeforemovingon?Mostpsychologistsfccllengthyhomecomingsarcamistakc．Children,strugglingtoestablishseparateidentities,canendupwith"ascnscofinadcquacy,dcfcatandfailurc"．Andagingparents,whoshouldbccnjoyingsomefinancialandpersonalfreedom,findthemselvesstuckwithresponsibilities．Manyagrccthatbriefvisits,howcvcr,canworkbcncficially.
Accordingtotheauthor,therewasonceatrendintheU.S.__________. A．foryoungadultstoleavethcirparcntsandliveindependently
B．formiddleclassyoungadultstostaywiththeirparents
C．formarriedyoungadultstomovebackhomcafteralengthyabsence
D．foryoungadultstogetjobsnearbyinordertolivewiththeirparents
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