单项选择题
A．the beginnings of oceanography B．the laying of the first undersea, cable C．the investigation of, ocean depths D．the early intercontinental communications
A．let women stay at home and have a baby B．allow only one of the parents to go out to work C．care for the growing needs of women for jobs D．punish the companies that permit women to leave
A．on B．by C．under D．with