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  3. In order to communicate thoughts and feelings, there must be a conventional system of signs or symbols which mean the same to th

In order to communicate thoughts and feelings, there must be a conventional system of signs or symbols which mean the same to th

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问题     In order to communicate thoughts and feelings, there must be a conventional system of signs or symbols which mean the same to the sender and the receiver.
    The means of receiving communications are too numerous and varied for systematic classification; therefore, the analysis must begin with the means of receiving communication. Reception of communication is achieved by our senses. Sight, heating, and touch play the most important roles.
    Example of visual communication are gesture and mini-cry. Although both frequently accompany speech, there are systems that rely solely on sight, such as those used by deaf and dumb persons. Another means of communicating visually is by signals of fire, smoke, flags or flashing lights. Feeling may be simply communicated by touch, such as handshaking , although a highly developed system of handshaking 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 feature 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.
The author specifically mentions that speech is ______.
选项 A、often used when communicating 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 heating
答案D
解析 由第三段最后一句可知，D为正确答案。
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