单项选择题

The author specifically mentions that speech is ________.

A．often used when communicating by touch
B．the most developed form of communication based on hearing
C．the only highly developed system of communication
D．necessary for satisfactory communication by gesture
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单项选择题
Which of the following statements about the ways of communicating ideas and feelings mentioned in the passage is NOT true
A．They can be used to communicate over long distances.
B．They require both a sender and a receiver.
C．They involve use of conventional signs and symbols.
D．They utilize the senses for reception.
单项选择题
By permissive period in education the author means a time ________.
A．when children are allowed to do what they wish to
B．when everything can be taught at school
C．when every child can be educated
D．when children are permitted to receive education
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