Once environmental damage（）, it takes many years for the system to recover.

A．warn young people of the trials what a successful writer experiences early in his/her career
B．advise young people to give up their dreams of becoming a professional writer
C．show young people it's unrealistic for a writer to pursue wealth and fame
D．encourage young people to pursue a writing career

A．who think too much of the darker side of life
B．who regret giving up their careers halfway
C．who think of lot without making a decision
D．who are full of imagination even until death