PHILADELPHIA is a football city. Philadelphia is a baseball city. Well, which is it? Aw, that's probably a trick question. Anybody who hasn't been asleep for a month probably finds himself subconsciously spelling a six-letter word that is the plural of our national bird, still finds himself unable to get a certain ditty out of his head - Hit 'em low, hit 'em high . . . - and can recite all the details of Jeff Garcia's life story by heart.