单项选择题

A．Water.
B．Hills.
C．Flat land.
D．Tall buildings.
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humanity
单项选择题
A．They are usually very high.B．They are always very low.C．they can be very different.D．They are actually the same.
A．They are usually very high.
B．They are always very low.
C．they can be very different.
D．They are actually the same.
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