Questions 18～21 are based on the following dialogue between two friends talking about traveling. What is the Japanese population in San Francisco

A．Pretty quick.
B．By8:00.
C．In a little while.
D．First thing in the morning.

A．Shift work had a direct effect on the attitudes and behavior of family members.
B．Shift workers could live a normal life.
C．Shift work couples had unconventional ideas about marriage.
D．Female shift workers were satisfied with the time spent together with their families.