whiCh oF thE Following BEst ExprEssEs thE mAin iDEA oF pArAgrAph 1
A．womEn usuAlly workED outsiDE thE homE For wAgEs.
B．mEn's AnD womEn's rolEs wErE EAsily ExChAngED in thE pAst.
C．mEn's rolEs At homE wAs morE Firmly FixED thAn womEn's.
D．mEn's AnD womEn's rolEs wErE usuAlly quitE sEpArAtED in thE pAst