Under normal conditions the act of communication requires the presence of at least two persons: one who sends and one who receives the communication. In order to communicate thoughts and feelings, there must be a conventional system of signs of symbols which mean the same to the sender and the receiver. The means of sending communications are too numberous and varied for systematic classification, therefore, the analysis must begin with the means of receiving communication. Reception of communicatio isachievedbyourenses.Sight,hearing,andtouch play the most important roles. Smell and taste paly very limited roles, for they cannot receive intellectual expression from fully developed systems of signs and symbols Examples of visual communication are gesture and mimicry (模仿). Although both frequently ac- company speech, there are systems that rely solely on sight, such as those used by deaf and dumb per- sons. Another means of communication visually is by signals of fire, smoke, flags and flashing lights. Feelings may be simply communicated by touch, such as by handshaking or backslapping, although a highly developed system of handstriking has enabled blind, deaf, and dumb persons to communicate intelligently. Whistling to someone, applauding in a theater, and other forms of communication by sound rely upon the ear as a receiver. The most fully developed form of auditory communication is, of course, the spoken language. The means of communication mentioned so far have two features in common: they last only a short time and the persons involved must be relatively close to each other. Therefore, all are restricted in time and space. 64. The author explains he will deal with reception of communication first because A. communication actually takes place when the message is received B. there are more means of receiving than of sending cmmunication C.reception of communications involves use of the senses D.it is difficult to organize by type the means of sending communication 65. Persons who cannot see, hear, or speak are able to communicate through a system of A. gesturing       B. handshaking      C. backslapping       D. handstriking 66. A form of visual communication often used with a type of auditory communicati A. gesturing     B. handshaking        C. backslapping       D. handstriking 67. The author specifically mentions that speech is A. often used when communication by touch B. necessary for satisfactory communication by gesture C. the only highly developed system of communication D.the most developed form of communication based on hearing 68.Which of the following statements about communication by touch is true? A. Touch is less important than taste as a means of communication. B. There is no well-developed system of communication based on touch. C. It is possible to communicate intelligently by touch alone. D. Touch must accompany visual communication.