"Why don't I learn? The answers to life's problems aren't at the bottom of a bottle. They're on TV!"—Homer Simpson A thirty-second spot on ABC's "Roseanne" will cost advertisers $375,000 next year. "Roseanne" is the No. 1 show of the past television season. It's a comedy of lower-middle-class resentment, of a particularly modern kind. The heroine is a woman who struggles to balance the obligations of holding a job and raising a family in a world of sexism, oppressive bosses, dead-end jobs, pinched finances, and other social forces generally unhelpful to people in her position.