单项选择题

The author specifically mentions that speech is ______.

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
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单项选择题
Applauding is specifically mentioned as an example of ______.
A．communication by sound
B．gesture and mini-cry
C．communication by touch
D．a simple system of visual communication
单项选择题
Which of the following statements about communication by touch is true
A．Touch is not important 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.
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