A、In family life. B、In education departments. C、In social contribution. D、In business world. A细节题。短文提到，社会中男女角色发生了很多变化，而最重要的变化发生在

Many changes are taking place in the way in which men and women look at their roles in society. We see these changes most dramatically in jobs and business situations. It is no longer unusual to find a male nurse or a female construction worker. Years ago, however, a man who worked as a nurse would have been looked down upon for doing a "woman’s job", and a female construction worker would have been roared off the construction site by her male co-workers. However, the most important changes that have taken place can be found in men’s and women’s roles in family life.
    Housework that used to be done by women is now often shared equally by men and women. Men have discovered at last that they too are capable of preparing the family dinner, rather than thinking that they are only capable of taking out the garbage.
     [20]Perhaps the greatest change that has taken place in the family is in parents’ new attitude towards bringing up children. While it is true that only mothers can breastfeed their infants, nowhere is it written that fathers cannot bathe their own babies or change diapers. And more and more of them are doing just that. These days, being a full-time parent is a job that fathers and mothers both share.
    As a result of these changes, we no longer insist that little boys play with trucks and grow up to be doctors, while little girls play with dolls and grow up to be housewives. Many men no longer feel that they must maintain a masculine attitude all the time, and many women no longer feel that they should be submissive and obedient. Changes like these do not occur overnight or even in a few years because they involve fundamental changes in attitude and behaviour.
19. Where does the most important change of men’s and women’s roles take place?
20. What is the greatest change that has taken place in the family?
21. What is the passage mainly about?