单项选择题

[听力原文]6-8
W: Hello, is that 342289
M: Yes, it is.
W: I’m inquiring about the flat which was advertised in the evening paper
M: Oh yes
W: I wonder if you could tell me how much the rent is a month, please
M: It’s $130.
W: I see. Is it near the city centre
M: Yes, it’s only about a kilometer away.
W: Which floor is it on
M: On the first floor.
W: I see. Would it be possible for me to see it tomorrow, say 6 o’clock
M: Yes, certainly.

Which floor is the flat on（）

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