单项选择题

A．1995.
B．1997.
C．1998.
D．1999.
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population
单项选择题
A．Insufficient housing.B．Lack of drinking water.C．Lack of food.D．Infectious disease.
A．Insufficient housing.
B．Lack of drinking water.
C．Lack of food.
D．Infectious disease.
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