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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