A．A disease can die, but never come back.
B．Cholera is a disease that doesn’t cause infections.
C．A comeback disease is only restricted in one area.
D．The comeback of a disease is due to a combination of many factors,

A．Loneliness is a risk factor.
B．The more time you spend with your family, the better.
C．People should not have cold relationships with others.
D．Reaching out to others is helpful to our bodies.