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 did the world's population reach six billion
A．October 10, 1999.
B．October 11, 1999.
C．November 10, 1999.
D．November 11, 1999.
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.
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