Questions 11 to 18 are based on the conversation you have just heard.

A．It was the largest city of Alaska.
B．There were a lot of wild animals around it.
C．It was a city of 40,000 people.
D．There was no sign of human presence around it.

A．It can increase production by 4.5 percent in factories at least.
B．It is sometimes very boring to the workers.
C．It can possibly give people better feeling and influence their attitudes.
D．It is always faster than any other music.