单项选择题

A．Navigation.
B．Drainage.
C．Irrigation.
D．Electricity.
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单项选择题
A．themB．whichC．whomD．that
A．them
B．which
C．whom
D．that
单项选择题
A．Cheaper and sometimes faster.B．More expensive, but faster.C．Cheaper. but more dangerous.D．Moro expensive and slower.
A．Cheaper and sometimes faster.
B．More expensive, but faster.
C．Cheaper. but more dangerous.
D．Moro expensive and slower.
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