单项选择题

What was the worlds population in 1500

A．300 million.
B．310 million.
C．500 million.
D．510 million.
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单项选择题
When will the world's population hit 10 billion
A．2010.
B．2002.
C．2036.
D．2054.
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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