During adolescence, the height and weight of boys and girls increase rapidly. In addition, the functions of nervous system, heart and lungs have also been significantly enhanced. Adolescent boys and girls also have certain physiological changes. Boys have nocturnal emission, and girls have menstruation. With the development of the body, sexual consciousness begins to sprout, which is often manifested from the initial alienation of the opposite sex to the gradual willingness to approach the opposite sex. Or have a hazy attachment to the opposite sex. These are normal psychological changes. At this time, we should pay more attention to setting up lofty ideals and concentrate on studying, working and cultivating noble sentiments. When boys and girls get along, they should help each other, encourage each other, make progress together and establish sincere friendship. In interpersonal communication, we should respect ourselves, do not smoke, and refuse drugs. So cut off all contact with the opposite sex.
So choose: C.