单项选择题

Which of following is the best title of the text

A．Above sea level.
B．Below sea level.
C．At a changing level.
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A．The woman.B．John.C．Jack.
A．The woman.
B．John.
C．Jack.
单项选择题
A．Traffic.B．IrrigationC．Electricity.
A．Traffic.
B．Irrigation
C．Electricity.
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