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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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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