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单项选择题

A．Its seaport.
B．Its culture.
C．Water transportation.
D．Its safety.
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单项选择题A．They are in land.B．They are seaports.C．They are agricultural.D．They are saf

A．They are in land.
B．They are seaports.
C．They are agricultural.
D．They are saf

单项选择题A．Before two years.B．Eight years old.C．Five years old.D．Seven years ol

A．Before two years.
B．Eight years old.
C．Five years old.
D．Seven years ol