单选题 Under normal conditions the act of communication requires the presence of at least two persons: one who sends and the other who receives the communication. In order to communicate thoughts and feelings, there must be a conventional system of signs and symbols which means the same to the sender and the receiver.
The means of sending 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, of which sight, hearing and touch play the most important roles.
Examples of visual communication are gesture and mimicry. 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. Feelings may be simply communicated by touch, such as by hand-stroking. Although a highly developed system of hand-stroking has enabled blind, deaf and dumb persons to communicate intelligently. Whistling to someone, applauding in a theatre, 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 communication: 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.

单选题 In the author"s opinion, the reception of communication should be dealt with first because ______.

单选题 Gesture is specially mentioned as an example of ______.

单选题 Which of the following statements about communication by hearing is true?

A、 Communication by hearing is more important than communication by sight.
B、 Whistling and applauding are the only two forms of communication by hearing.
C、 Handshaking, as well as hand-stroking, has enabled the blind to communicate by hearing.
D、 It is possible to communicate intelligently by hearing.

单选题 According to the passage alone, which of the following statements is NOT TRUE?

A、 The spoken language is the most highly developed form of auditory communication.
B、 Normally, the act of communication requires the presence of at least three persons.
C、 The means of communication mentioned in the passage last only for a moment.
D、 Fire, smoke, flags and flashing lights can all be signals of visual communication.

单选题 What is the passage mainly about?

A、 Spoken is the best way of communication.
B、 Reception of communication can be achieved by our sight, hearing and touch, and these means of communication share two features in common.
C、 In communication a conventional system of signs and symbols means the same to the sender and receiver.
D、 The means of communication are restricted in time and space.