【简答题】Depression involves sadness, pessimism, a preoccupation with personal problems, and perhaps feeling sorry for one's self, anguish, crying, and hopelessness. Depressed people often lose interest in man...
【简答题】How much sleep do we need?People are all different. Some people need only three or four hours of sleep a night. Others need ten hours of sleep a night. Most Americans sleep seven to eight hours a nigh...