According to the passage, what do the human beings depend on to structure the world in important ways

A．Ozone is an extremely inactive gas.
B．Ozone only exists in the upper atmosphere.
C．Ground-level ozone is closely related to people’s health.
D．Children breathe more air per pound of body weight than adults.

A．Ask for some pills to stop it.
B．Punish children for their misconduct.
C．See the doctor first.
D．Dry the beddings as soon as possible.