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57（）

【参考答案】

F
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单项选择题
Which form other than oral speech would be most commonly used among blind people()

A．Picture signs.
B．Braille.
C．Body language.
D．Signal language.
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In the year 2000, it is expected that world population will be()

A．350 million
B．25,000 million
C．4,000 million
D．7,000 million
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