听力原文:W: Would you help me for a minute, please? M: Of course. What do you want me to do? W: Could you hold these packages while I look for the key to the door? M: I'd be glad to. What's in these packages? They're extremely heavy. W: Just the filings we need for the picnic tomorrow. M: Well, hurry up and open the door. I told you these things were heavy. W: I can't find the key. You must have it. M: You are right, but how can I get the key while I'm holding all these packages? (18)