单项选择题

A．How Aswan Dam Was Built.
B．How Holland Solved Its Drainage Problem.
C．Transporting with Canal Boats.
D．Canals and Their Uses.
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单项选择题
A．Navigation.B．Drainage.C．Irrigation.D．Electricity.
A．Navigation.
B．Drainage.
C．Irrigation.
D．Electricity.
单项选择题
A．themB．whichC．whomD．that
A．them
B．which
C．whom
D．that
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