Based on love and guided by marriage.
The adaptability of human body to environment.
Irritation to the skin
You can wear headphones to listen to music for a long time, and there is no need to have a proper rest.
Neither of the first two statements is correct.
3 (if I remember correctly, it was one or two grades, and later it was divided into three grades: A, B and C)
trachoma
Rural and urban poor
Health is not only the absence of disease, but also physical health, mental health, good social adaptation and moral health.