单项选择题

A．To protect persons and property.
B．To collect taxes.
C．To teach and train citizens.
D．To save natural resources for future use.
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单项选择题
Port attracts subsidiary and independent industries.
A．Y
B．N
C．NG
单项选择题
Most people in a port city are engaged in international trade and finance.
A．Y
B．N
C．NG
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