单项选择题

When did the world's population reach six billion

A．October 10, 1999.
B．October 11, 1999.
C．November 10, 1999.
D．November 11, 1999.
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单项选择题
How long did it take for the world's population to increase from 2 billion to 3 billion
A．304 years.
B．123 years.
C．33 years.
D．14 years.
单项选择题
When will the world's population hit 10 billion
A．2010.
B．2002.
C．2036.
D．2054.
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