单项选择题
A．will have little time playing B．has to be successful in finding a job C．can still ask for help in time of trouble D．should be able to take care of himself
A．life is not enjoyable since, each age has some pains B．young men can have the greatest happiness if they work hard C．childhood is the most enjoyable time in one's life D．one is the happiest if he can make good use of each age in his life
A．examples of successful young men B．how to build up one' s position in society C．joys and pains of old people D．what to do when one has problems in life