The main income of the city of Valencia is from its （）

单项选择题What is the main difference between the two parts of the city（）

A．The colour of the buildings
B．The age of the buildings
C．The colour of the roofs
D．The length of the streets

单项选择题From the text, how many places have the name Valencia（）

A．One
B．Two
C．Three
D．Four