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听力原文:W: Hi, Mike. This is Sally Harris from Four Seasons Heating. I'm calling to let you know that the part you have been waiting for is in. Should I send someone over today to install it? M: Absolutely. We've been freezing here without using the heating system over the weekend. I never realized that our heating system would break down during the coldest month of the year. W: This kind of problem happens a lot. I think I can have one of our staff over there by noon. He will call from his mobile phone when he' s on his way. M: Thanks a lot. It will be much warmer tonight. What is the purpose of Sally' s call?