Questions 22 to 25 are based on the conversation you have just heard.

A．the fact that people of different nationalities or ethnical groups reside in different places
B．why people of one type prefer to isolate themselves from those of another type
C．peculiar characteristics of people from different countries in choosing living places
D．what types of people like to move frequently and why they keep changing their living places

A．The earth is a planet.
B．Stars in the sky are actually as small as they look.
C．Satellites are all made by men.
D．Men can conquer other planets.