单项选择题

Sign language is said to be very vivid and exact and can be used internationally except for ( )

A．spelling
B．ideas
C．whole words
D．expressions
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单项选择题
Which form other than oral speech could be most commonly used among blind people ( )
A．Picture signs.
B．Braille.
C．Body language.
D．Signal flags.
单项选择题
How many different forms of communication are mentioned here ( )
A．5.
B．7.
C．9.
D．3.
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