At first the author looked upon life as a process of getting. He formed this view of life because ______.

A．he overheard their conversation
B．he had received a lot of complaints for lack of post-office boxes
C．he was thankful for the letter the author had written
D．he was proud of their good service

A．it has a smaller population
B．it is an international city
C．it is more difficult to go somewhere on foot in Tokyo
D．its people are more friendly and more polite