An adult accompanying with two children aged 1 and 3 years old, how much will the adult pay for the travel if the normal fare is $ 220

A．how some bosses act displeasingly
B．how optimists explain some bad events
C．how pessimists think about the unhappy things around them
D．how the writer suggests people should do when facing something unpleasant

A．the dividing line between optimists and pessimists
B．young women today suffer a lot in doing housework
C．most of young wives are pessimists
D．the pessimists are used to thinking of everything negatively