A、His diet. B、His habit. C、His living environment. D、His inheritance. D

M: I need a haircut. But you look pretty busy today. Do you have an opening for me?
W: Yes, we do. I can cut your hair right now if you like. Do you need a shampoo too? Or just a haircut?
M: Just a haircut. I washed my hair this morning.
W: Alright. (12)I will have an assistant wet your hair. Then I can start. Please step over there. How would you like to have your hair cut today?
M: Well, I had a haircut eight weeks ago. So my hair is pretty long. However, I want the same style as the last time.
W: I recommend you leave it a little long on top. But we should take in the back and sides a bit more. That’s more fashionable now.
M: Alright. You are the expert. I’m happy to have your recommendation.
W: And do you usually part your hair along here?
M: Yes.
W: Alright, I know just what to do. (13)Your hair seems quite dry, you know. And I see some split ends.
M: (13) Yes, I know my hair is quite thin. (14)It runs in my family. Everybody has very thin hair.
W: The problem is the split ends. They make your hair look frizzy (卷曲的) .
M: I don’t know what to do with it.
W: Well, it’s easy. Don’t blow-dry your hair for so long after you shower. (15)Let it dry naturally, then you won’t get split ends. M: Oh really? I will try. Thanks.
　　12.  What will the woman do before cutting the man’s hair?
　　13.  What’s the problem of the man’s hair?
　　14.  What causes this hair problem?
　　15.  What does the woman suggest the man do to deal with his hair problem?