单项选择题

A．Rats can populate rapidly.
B．Population explosion can lead to violence.
C．Overcrowdedness may have the same effects on man.
D．It is a natural law that animals live and die.
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单项选择题
A．Take herbal medicine.B．See another doctor.C．Drink chicken soup.D．Stay in bed.
A．Take herbal medicine.
B．See another doctor.
C．Drink chicken soup.
D．Stay in bed.
单项选择题
A．The unsmiling faces.B．The sun.C．The residents.D．The weather.
A．The unsmiling faces.
B．The sun.
C．The residents.
D．The weather.
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