Questions 19 to 22 are based on the conversation you have just heard.

A．Warm-hearted, self-disciplined, patient.
B．Hot-tempered, diligent, kind.
C．Easy-going, warm-hearted, stubborn.
D．Self-centered, hard-working, considerate.

A．The population of elderly people.
B．Nuclear weapon.
C．Violence in crime.
D．Living standards.