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听力原文:M: Fancy seeing you here. I didn't know you rode the subway. W: I'm fed up with driving and paying so much for gas, and the buses are crowded and unreliable. M: Yeah, I really appreciate taking the subway! From the Scott Street station, it's only half a block to our office. And going home, the 52nd Street stop is only two blocks from my apartment. W: Plus, the trains leave every 5 minutes, so if I miss one, I don't have to wait long for another. What are the speakers mainly discussing?