听力原文:W: This refrigerator is not working properly. I think we should buy a new one, but I don't see how we can afford it right now. M: If only we hadn't bought that motorbike. Q: Why didn't they buy another refrigerator? (15)
【简答题】A.When actual suppliers and ultimate buyers deal through a middleman. B.When buyers and sellers agree to make settlement by means of letters of credit. C.When buyers don't agree to make payment on col...