听力原文:W: Could we talk a little about the problem of the old? I wonder if you could beg
M: Well, of course it is an increasingly serious problem, I mean a fairly large part of the old population becomes confined to the house. They cannot go out, because they don't want to trouble others, thus little by little they become a burden to the younger generation.
Q: What are the speakers talking about?
(17)
A.Population explosion.
B.Generation Gap.
C.Problem of the aged.
D.Climate changes.