27.Taste is a special sense closely related to smell. Taste conveys information about fairly high concentrations of chemicals dissolved in liquids while smell detects lower concentrations of chemicals in gaseous form. ______ For example, when the nasal passages are blocked, as when one has a cold, it is difficult to distinguish between bland foods. (A) The sensations perceived in the brain evidently result from a complex coding of the electrical impulses transmitted by the receptor cells. (B) A single taste receptor cell may alter its output of electrical impulses to any three or four of these so-called modalities (C) The tympanic membrane of the inner ear is mysteriously related to our perception of taste. (D) Often, smell plays an important role in the perception of many sensations considered to be tastes. (E) Because of the accessibility of taste receptors in some insects, much of the fundamental research on taste mechanisms has been conducted on these animals.