B.not have absorbers.

　　C.achieve a pleasing mixture of sound.

　　D.have smooth surfaces.

　　44.【题干】Large pillars and corners may_____

　　A.make sound rich and full.

　　B.be cures for sound problems.

　　C.be sources of sound problems.

　　D.function as effectively as clouds.

　　45.【题干】The word "acoustic" in the last paragraph has something to do with_____

　　A.performance.

　　B.sound.

　　C.audience. (责任编辑：admin)