A、One. B、Two. C、Three. D、Four. C本题询问他们有几个孩子。对话中女士说需要七个房间：一间是他们夫妻俩的卧室，一间厨房，一间浴室，一间起居室，这样还剩三间，每个孩子一人一间，即他们有三个孩子，故答案为C)。

M: I have been running the sports ground every morning for nearly a month. But the scale shows no hints of losing weight. I wonder if it is worth it.
W: You see, usually it seems very hard when you are starting out. It may work one month later.
Q: What does the woman mean?

M: How many rooms do you want in a house?
W: Well, to begin with, one bedroom for each of the children and one for us. And I want a bathroom, a big kitchen and a living room with lots of sunlight in it. Yes, altogether seven rooms.
Q: How many children do they have?