单项选择题

Which of following is the best title of the text

A．Traffic.
B．Irrigation.
C．Electricity.
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单项选择题
A．Cheaper and sometimes faster.B．More expensive, but faster.C．Cheaper, but more slower.
A．Cheaper and sometimes faster.
B．More expensive, but faster.
C．Cheaper, but more slower.
单项选择题
A．How Aswan Dam was buik.B．Transporting with canal boats.C．Canals and their uses.
A．How Aswan Dam was buik.
B．Transporting with canal boats.
C．Canals and their uses.
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