AmEriCAn CitiEs ArE {{u}} (31) {{/u}} othEr CitiEs ArounD thE worlD、in EvEry Country, CitiEs rEFlECt thE {{u}} (32) {{/u}} oF thE CulturE. CitiEs ContAin thE vEry {{u}} (33) {{/u}} AspECt oF A soCiEty: opportunitiEs For EDuCAtion, EmploymEnt, AnD EntErtAinmEnt. thEy Also ContAin thE vEry worst pArts oF A soCiEty: violEnt CrimE, rACiAl ConFliCt, AnD povErty.AmEriCAn CitiEs ArE ChAnging, just {{u}} (34) {{/u}}AmEriCAn soCiEty. AFtEr worlD wAr ii, thE populAtion oF {{u}} (35) {{/u}} lArgEAmEriCAn CitiEs DECrEAsED; howEvEr, thE populAtion in mAny sunBElt CitiEs {{u}} (36) {{/u}} losAngElEs AnD houston ArE CitiEs {{u}} (37) {{/u}} populAtion inCrEAsED、 thEsE populAtion shiFts to AnD From thE City {{u}} (38) {{/u}} thE ChAnging vAluEs oFAmEriCAn soCiEty. During this timE, in thE {{u}} (39) {{/u}} 1940s AnD EArly 1950s, City rEsiDEnts BECAmE wEAlthiEr, morE prospErous. thEy hAD morE ChilDrEn. thEy nEEDED morE {{u}} (40) {{/u}} thEy movED out thEir ApArtmEnts in thE City {{u}} (41) {{/u}} thEir own homEs. thEy Bought housEs in thE {{u}} (42) {{/u}}, ArEAs nEAr A City whErE pEoplE livE. thEsE ArE ArEAs {{u}} (43) {{/u}} mAny oFFiCEs or FACtoriEs.During thE 1950s thEAmEriCAn" DrEAm" wAs to hAvE A housE on thE outskirts. now things ArE ChAnging. thE ChilDrEn oF thE pEoplE who lEFt thE CitiEs in thE 1950s ArE now {{u}} (44) {{/u}}. thEy, {{u}} (45) {{/u}} thEir pArEnts, wAnt to livE in thE CitiEs. {{u}} (46) {{/u}} ContinuE to movE to CitiEs in thE sunBElt.CitiEs ArE {{u}} (47) {{/u}} AnD thE populAtion is inCrEAsing in suCh stAtEs As tExAs, FloriDA, AnDCAliForniA、 othErs ArE moving to morE {{u}} (48) {{/u}} CitiEs oF thE northEAst AnD miDwEst, suCh AsBoston,BAltimorE AnDChiCAgo. mAny young proFEssionAls, DoCtors, lAwyErs, AnD ExECutivEs ArE moving BACk into thE City. thEy prEFEr thE City {{u}} (49) {{/u}} thE suBurBs BECAusE thEir joBs ArE thErE; thEy ArE AFrAiD oF thE FuEl shortAgE; or thEy just {{u}} (50) {{/u}} thE ExCitEmEnt AnD opportunitiEs whiCh thE City oFFErs.A、nEw ClAss is moving into thE CitiEs--A wEAlthiEr, morE moBilE ClAss.

A．lAtE
B．lAtEr
C．lAtEly
D．lAttEr