Assuming thAt A ConstAnt trAvEl-timE BuDgEt, gEogrAphiC ConstrAints AnD short-tErm inFrAstruCturE ConstrAints pErsist As FunDAmEntAl FEAturEs oF gloBAl moBility, whAt long-tErm rEsults CAn onE ExpECt in high-inComE rEgions, {{u}} (41) {{/u}} northAmEriCA, our piCturE suggEsts thAt thE shArE oF trAFFiC {{u}} (42) {{/u}} suppliED By BusEs AnD AutomoBilEs will DEClinE As high-spEED trAnsport risEs shArply. in DEvEloping CountriEs, wE {{u}} (43) {{/u}} thE strongEst inCrEAsE to BE in thE shArEs First For BusEs AnD lAtEr For AutomoBilEs. gloBAlly, thEsE {{u}} (44) {{/u}} in Bus AnD AutomoBilE trAnsport ArE pArtiAlly oFFsEtting. in All rEgions, thE shArE oF lowspEED mil trAnsport will proBABly ContinuE its strongly {{u}} (45) {{/u}} DEClinE. wE ExpECt thAt throughout thE pErioD 1990～2050, thE {{u}} (46) {{/u}} northAmEriCAn will ContinuE to DEvotE most oF his or hEr 1.1-hour trAvEl-timE {{u}} (47) {{/u}} to AutomoBilE trAvEl. thE vEry lArgE DEmAnD {{u}} (48) {{/u}} Air trAvEl (or high-spEED mil trAvEl) thAt will BE mAniFEst in 2050 {{u}} (49) {{/u}} to only 12 minutEs pEr pErson A DAy; A littlE timE goEs A long wAy in thE Air. in sEvErAl DEvEloping rEgions, most trAvEl {{u}} (50) {{/u}} in 2050 will still BE DEvotED to nonmotorizED moDEs.BusEs will pErsist {{u}} (51) {{/u}} thE primAry Form oF motorizED trAnsportAtion in DEvEloping CountriEs For DECADEs.{{u}} (52) {{/u}} importAnt Air trAvEl BEComEs, BusEs, AutomoBilEs AnD {{u}} (53) {{/u}} lowspEED trAins will surEly go on sErving vitAl FunCtions.{{u}} (54) {{/u}} oF thE supEr-riCh AlrEADy CommutE AnD shop in AirCrAFt, But AvErAgE pEoplE will ContinuE to spEnD most oF thEir trAvEl timE on thE {{u}} (55) {{/u}}.

A．ADmirE
B．AssurE
C．AssErt
D．AntiCipAtE