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 languag

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单项选择题

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

单项选择题

57（）

A. Can I help you
C. Safety belt, please.
E. Is there anything serious
G. What flight are you taking
B. We are taking off at last.
D. The engine went wrong.
F. Just a moment, please.
H. It should be OK in an hour.