A、An American family. B、One of their friends. C、A foreign custom. D、An unpleasant journey. C

W: You know, many countries are involved in the nuclear issue and disputes between them have been arising. So I believe that nuclear-related products are not good for the world peace.
M: Well, every thing has its pros and cons. It’s terrific to use energy carefully to produce power, but if it leaks out and threatens human health, totally dangerous.
Q: What does the man say about the nuclear issue?

M: When I was traveling in America I couldn’t get used to their custom of using people’s first names.
W: They usually call their good friends by their first names.
Q: What are the speakers talking about?