A、He has some interest in music. B、He is a double major. C、He is a professional in music. D、He is crazy about music. D

W: You have a very good stereo system ... What a fine sound it produces! I feel like I’m sitting in a grand concert hall.
M: It is a good system. It has fine treble, soft bass and perfect surround effects.
W: What did you buy this expensive system for? Do you like music?
M: Very much. I like music so much that the moment I get home I’ll turn on my stereo.
W: You are crazy about music.
M: Yes, I am. I can’t live without it.
W: What type of music do you like the most?
M: I enjoy listening to almost all categories of music -- classical, jazz, country-western, the heavy metal type of rock ... Yes, my favorite music is new age -- I’m really very fond of it.
W: I’d suggest that you should major in music instead of English.
M: Absolutely. But English is fine. I like English as much as music. I wish I were a double major. Actually I’m more fascinated and delighted with the hardware of music reproduction.
W: The hardware of music reproduction?
M: I mean musical instruments, such as the bone whistles of the Stone Age and the digital Synthesizers of this age.
W: You certainly are an expert on music. May I ask you a question?
M: Sure.
W: I hear people talk about "hi-fi". Is it a sound system or something else?
M: It’s popularly known as a stereo system. A more accurate definition is a stereo system that reproduces music very realistically with high fidelity quality. In the early stage, a hi-fi system used compact cassettes containing magnetic tape.
W: A cassette-tape player?
M: Right, but the weakness is that it produces annoying "hiss" noise while playing.
W: This was one of the reasons why I bought a CD player when the cassette player broke down.
M: The CD system’ will soon be out of date, replaced by some improved technology.
W: Yes, I Believe it won’t take long before the change occurs.