41.【题干】This passage is mainly about_____

　　A.sound waves and their effects.

　　B.the types of music orchestras play.

　　C.walls of an auditorium.

　　D.the design of an auditorium.

　　42.【题干】Wagner operas and Mahler symphonies with full-sound effect have_____

　　A.a short reverberation time.

　　B.an intermediate reverberation time.

　　C.no reverberation time.

　　D.a long reverberation time.

　　43.【题干】This passage suggests that a good auditorium should_____

　　A.get rid of all reflections. (责任编辑：admin)