<正>Aspecial-needs Bronx~2 boy spent 12 hellish hours on a city school bus during Thursday’s frozen fiasco~3—until his desperate mother finally reached him after a nine-hour trek~4 by car and foot, she told The Post~5.Frantic Christina Christie eventually ditched~6 her vehicle and marched a final 20 blocks through the driving sleet~7 to reach her shaken 5-year-old.