In Europe _______ are the two leading contenders for a global reservations system.
A、SABREandGALILEOC
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Heshookhandswiththevisitors________astoconveyhisapology.
Whichofthefollowingisnotaninternationalvisitor?
Bythemiddleofthe21stcentury,thevastmajorityoftheworld’spopulationwillbelivingincities_______inthecountry.
AccordingtoMaslow,self-actualizationneedexcludes_______
Hefound_______difficulttostudymaths.
