听力原文：W: Dave. I'm going to the supermarket to pick up food and drink for Saturday's picnic. Any suggestions？
M: Well, everyone has been talking about having a barbecue down by the river, so why don't you pick up some hamburger and hot dogs？
W: Okay, but how much hamburger are we going to need？ And hot dogs too？
M: Uh, I don't know. How about three pounds of hamburger and a couple packages of hot dogs？
W: Oh, that's not going to be enough. Do you remember the last picnic we went on？ Your roommate, Jim, ate about ten hamburgers by himself!
M: You're right. Let's see. I'd better write this down. Uh, let's see about nine pounds of hamburger meat and, uh .... seven packages of hot dogs.
W: And you'd better pick up some chicken for those who don't like hamburger or hot dogs.
M: Okay. How about five or six bags of potato chips？
W: Humm. Better make that eight or so.
M: All right. Oh, and we're gonna need some hamburger and hot dog buns, How about five packages a piece？ I think that sounds about right.
W: Yeah, you'd better pick up some mustard, catchup, and mayonnaise too.
M: Okay. What else？ Uh, we're gonna need some soft drinks. How about ten of those big 2-liter bottles？
W: Sounds fine, but be sure to buy a variety of drinks.
M: Okay. And what about dessert？
W: Well, maybe we could ask Kathy to make a few cherry pies like she did last time.
M: Well, I heard that she's been very busy working two jobs, so we'd better not ask her, uh... Hey, why don't you whip up some of your oatmeal cookies？ Hey, you could even ask, uh... what's her name.., yeah that new girl, Susan, the one that moved in across the street! I bet she'd be willing to help you !
W: Nah, I don't think I could ask her, I haven't got a phone number. Anyway, I can try myself.
(20)
A．At a park.
B．At the beach.
C．At Dave's house.
D．By a river.
