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

Henry Ford changed the American society ______.()

A. through numerous mechanical inventions
B. through automotive technological revolution
C. through great social revolution
D. through radical political reforms