题目

   The simplest way of listening to music is to listen for the sheer pleasure of the musical sound itself. That is the sensuous plane(感官层面). It is the plane on which we hear music without 29   in any way. One turns on the radio while doing something else and absent –mindedly bathes in the   30   .A kind of brainless but   31  state of the mind is caused by the mere sound effect of the music. This    32    to every normal human and is self-evident. The sensuous plane is an important one in music, a very important one, but it does not   33     the whole st只有一种试剂就能将NaOH、NaCl、BaCl2三种溶液鉴别出来，它是（       ）   A. CuSO4溶液                 B. Na2SO4溶液             C. 酚酞试液                D. FeSO3溶液