单项选择题
A．wives who can' t do any housework B．wives who don' t like to stay at home C．wives staying at home doing housework D．wives working outside home sometimes
A．husbands hire others to do their housework B．husbands pay their wives for their work at home C．policies he worked out on women' s wages D．women go out to work instead of working at home
A．the main cause of lung cancer is second-hand smoke B．most people know nothing about the danger of second-hand smoke C．public places are dangerous for people to stay D．children suffer most from second-hand smoke