单项选择题

21()

A.by
B.for
C.with
D.in

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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

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.

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