Health: refers to a person with normal intelligence, reasonable behavior, ability to adapt to normal work, social interaction or learning, and resistance to general diseases. According to the definition of health, Which of the following are healthy:. ['University professor Lao Li, although in his fifties, is still energetic at work and has contracted flu this spring.', "Zhang Chong's 19-year-old son, Xiao Cong, was in his second year of elementary school when he was 11 years old, but he didn't have any serious illness since childhood.", "Xiao Hu's work performance has been excellent after graduating from master's degree. After an accident, when the work pressure is relatively high, he will be mentally disordered.", 'Xiao Liu is in good health, works very hard, and respects his parents, but many colleagues say that he is weird and would not associate with him.']