听力原文：W: City utility department, how may I help you? M: Yes, I'm new here and trying to figure out how garbage and recycle collection work. My understanding is that garbage is collected on Wednesdays, and recyclables on Thursdays. W: No. Recyclables are Wednesday, and garbage Thursday. You need to put your garbage can and recycling containers in front of your house by 7 a. m. On both those days, our pick-up trucks will be there between 7 a. m. and 5 p. m. M: I see. Thank you very much for your assistance. What is the main topic of the conversation?