单项选择题

A．At low latitudes.
B．At mid-latitudes.
C．At high latitudes.
D．At high altitudes.
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单项选择题
A．It is a good place to land at by aeroplane.B．It is a good place to fly over.C．It is a good place to travel to by land.D．It is a good place to live at.
A．It is a good place to land at by aeroplane.
B．It is a good place to fly over.
C．It is a good place to travel to by land.
D．It is a good place to live at.
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