题目内容：
A．AsthemanagerofaChinatowncareercenteronKearnyStreetinSanFrancisco,WinnieYuhaswatchedworking-classclientscomeandgo.Mostofthem,likeShenMingFa,havethemakingsofthetypicalChineseAmericanimmigrantsuccessstory.Shen,whois39,movedtoSanFranciscowithhisfamilyinthefallof2010,anEnglish-speakingfutureinmindforhis9-year-olddaughter.HisfirststopwasChinatown,wherehefoundaninstantcommunityandhelpwithjobandimmigrationproblems.
B．Butlately,Yuhasbeenseeingashift;ratherthancoming,herclientshavebeengoings--inpursuitofwhatmightbecalledtheChineseDream.
C."NowtheAmericanDreamisbroken,"Shentellsmeoneeveningatthecareercenter,hisfingersdrummingrestlesslyonthetable;hespeaksmostlyinMandarin,andYuhelpsmetranslate.Shenhasmostlybeenunemployed,pickinguppart-timeworkwhenhecanfindit."InChina,peoplelivemorecomfortably:inabighouse,withagoodjob.Lifeisdefinitelybetterthere."
Onhisfingers,hecountsoutseveralpeopleheknowswhohavegonebacksincehecametotheUnitedStates.WhenIaskhimifhethinksaboutreturningtoChina,heglancesathisdaughter,whoissittingnearby,thenlooksmeintheeye."Mydaughteristhriving,"hesays,carefully."ButIthinkaboutiteveryday."
D．RecentyearshaveseenstoriesofChinese"seaturtles"--thosewhoareeducatedoverseasandmigratebacktoChina--attractedbyChinese-governmentincentivesthatincludefinancialaid,cashbonuses,taxbreaks,andhousingassistance.In2008,ShiYigong,amolecular(分子的)biologistatPrinceton,turneddowna$10millionresearchgranttoreturntoChinaandbecomethedeanoflifesciencesatBeijing'sTsinghuaUniversity."Mypostdocsaregettinggreatoffers,"saysRobertH.Austin,aphysicsprofessoratPrinceton.
E.Butunskilledlaborersaregoingback,too.LaborshortagesinChinahaveledtobothhigherwagesandmoreoptionsinwheretheycanwork.TheMigrationPolicyinstitute,aWashington,D.C.-basedthinktank(智囊团),publishedapaperonChina'sdemography(人口统计学)through2030thatsaysthinkingofmigrationasmovinginjustonedirectionisamistake:theflowsareactuallymuchmoredynamic(动态的)."Migration,thewayweunderstanditintheU.S.,isaboutpeoplecoming,staying,anddyinginourcountry.Therealityisthatithasneverbeenthatway,"saystheinstitute'spresident,DemetriosPapademetriou.
F."Historically,over50percentofthepeoplewhocamehereinthefirsthalfofthe20thcenturyleft.Inthesecondhalf,thereturnmigrationsloweddownto25,30percent.Buttoday,whenwetalkaboutChina,whatyou'reactuallyseeingismorepeoplegoingback...Thismaystillbeatrickle(缓慢来或去的少量事物),intermsofourdatabeingabletocaptureit--there'salwaysgoingtobealagtimeofacoupleofyears--butwiththecombinationofbadlaborconditionsintheU.S.andsustainedorbetterconditionsbackinChina,increasingnumbersofpeoplewillgohome."
G.Inthepastfiveyears,thenumberofChineseimmigrantstotheU.S.hasbeenonthedecline,fromapeakof87,307in2006to70,863in2010.BecauseChinatownsarewhereworking-classimmigrantshavetraditionallygatheredforsupport,theriseofChina--andtheslowingofimmigrantflows--allbutensurestheendofChinatowns.
H．SmallerChinatownshavebeenfadingforyears--justlookatWashington,D.C.,whereChinatownisdowntoafewblocksmarkedbyarichlydecoratedwelcomegateandpopulatedmostlybychainslikeStarbucksandHooters,withsignsinChinese.ButnowtheChinatownsinSanFranciscoandNewYorkaredepopulating,becominglessresidentialandmoreservice-oriented.
Whentheinitial2010U.S.census(入口普查)resultswerereleasedinMarch2011,theyrevealeddropsincoreareasofSanFrancisco'sChinatown.InManhattan,thecensusshowedadeclineinChinatown'spopulationforthefirsttimeinrecentmemory--almost9percentoverall,anda14percentdeclineintheAsianpopulation.
I．Theexodus(大批离去)fromChinatownishappeningpartlybecausetheworkingclassisgettingpricedoutofthistraditionalcommunityandheadingtothe"ethnoburbs"(少数族裔郊区);developmentcontinuestopushresidentsoutoftheneighborhoodandintoother,secondaryareaslikeFlushing,Queens,inNewYork.Buttheinflux(大量涌入)ofmigrantswhoneedthenetworksthatChinatownprovidesisitselfslowingdown.Notably,thepercentageofforeign-bornChineseNewYorkersfellfromabout75percentin2000to69percentin2009.
J．Chinatownsalmostdiedoncebefore,inthefirsthalfofthe20thcentury,whenvariousexclusionactslimitedimmigration.PhilipChoy,aretiredarchitectandhistorianwhogrewupinSanFrancisco'sChinatown,hasobservedtheneighborhoodpopulationofChineseimmigrantsbeingreplacedbynewgenerationsofChineseAmericans."Chinatownmighthavedisappearedifitweren'tforthechangingimmigrationpolicies,"hetoldmerecently.Onlyafterthe1965ImmigrationandNaturalizationActliftedquotas(限额)didtheChinesereviveChinatownsallacrossthecountry--especiallythosecommunitiesinNewYork,SanFrancisco,andLosAngeles.Ofcourse,sincethedaysoftheGoldRush,theChinesealwaysthoughttheyweregoingtomovebacktoChinaafterearningtheirfortuneelsewhere.AsPapademetrioutoldme,whatcamebeforeoftenhappensagain.Onlynow,fortunecanbefoundathome.
Working-classChineseimmigrantsaretraditionallyinclinedtoseekhelpandsupportfromChinatown.
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