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

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单项选择题

A．what makes people feel cool near a lake or an ocean in summer
B．everything about the ocean
C．why the ocean does not get more and more salty
D．what happens to the salt in the ocean

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