A．you have to be in two places at once
B．the cells are subject to an excessive burden
C．the body is free from diseases
D．you are involved in too many activities
A．Some pathological fatigue is good for people.
B．Everyone is vulnerable to pathological fatigue.
C．Pathological fatigue needs no medical attention.
D．Pathological fatigue harms people psychologically only.
A．Psychological fatigue happens to those involved in war.
B．Rest is the only solution for psychological fatigue.
C．Physically healthy people do not suffer from psychological fatigue.
D．Physical labor can get some people out of psychological fatigue.
A．The consequences of fatigue.
B．The reason why people need rest.
C．The dangers of fatigue.
D．Types of fatigue.