C
The way people hold to the belief that a fun-filled, painfree life equals happiness actually reduces their chances of ever getting real happiness．If fun and pleasure are equal to happiness then pain must be equal to unhappiness．But in fact, the opposite is true: more often than not things that lead to happiness is connected with some pain．
As a result, many people avoid the very attempts（尝试）that are the source of true happiness They fear the pain brought by such things as marriage, raising children, professional achievement, religious commitment（承担的义务），self-improvement．
Ask a bachelor（单身汉）why he refuses marriages even though he finds dating to be less and less satisfying, if he’s honest he will tell you afraid of making a commitment．For commitment is in fact painful．The single life is filled with fun, adventure, excitement．Marriage has such moments, but they are not its most unusual features．
Couples with baby children are lucky to get a whole night’s sleep or a three-day vacation．I don’t know any parent who would choose the word fun to describe raising children．But couples who decide not to have children never know the joys of watching a child grow up or of playing with a grandchild．
Understanding and accepting that true happiness has noting to do with fun is one of the most liberating realizations．It liberates（解放）time; now we can devote more hours to activities that can increase our happiness．It liberates money: buying that new car or those fancy clothes that will do nothing to increase our happiness now seems pointless．And it liberates us from envy: we now understand that all those who are always having so much fun actually may not be happy at all．
48．Raising children, in the author’s opinion, is________．
A．a duty we should have to perform      B．a thankless job
C．a source of pain that can’t be avoided    D．a rewarding task
49．To understand what true happiness is one must________．
A．have as much fun as possible during ones lifetime
       B．make every effort to free oneself from pain
C．put up with pain in all conditions
D．be able to tell happiness from fun
50．What is the writer trying to tell us?
A．One must know how to get happiness
B．Happiness often goes hand in hand with pain
C．It is important to make commitments
D．Pain usually leads to happiness