The main idea in the second paragraph is ______.

A．Because the traveling expenses are high.
B．Because the rents are too high for most people.
C．Because it is easier to get familiar with the area.
D．Because it is easier to join in the life of a city.

A．It was cleaned.
B．There was a large sale.
C．The employees had to work very late.
D．There was a robbery.