48. What can we conclude from Stafford’s research? 　　
(A)Marriage gives men more freedom. 　　
(B)Marriage has effects on job choices. 　　
(C)Housework sharing changes over time. 　　
(D)Having children means doubled housework.

主旨大意：通过全文可以得知：Housework sharing changes over time.家务劳动的承担发生着变化。