听力原文:M: How do you keep in touch with old friends? W: I find email faster than the post and cheaper than phoning. I think I'd lose touch with people without it. Q: Why does the woman use email for keeping in touch with old friends? (18)
A.
She doesn't.
B.
It offers the best combination of speed and low cost.
C.
She believes that, in the modern world, it is essential.
D.
She thinks that people who do not have email will lose touch with their old friends.