The last time a member of Cathy's family asked, "When are you going to start a family?" her answer was, "We're a family!"Cathy and Wayne belong to a growing number of young married couples who are deciding not to have children. A recent survey showed that in the last five years the percentage of wives aged 25 to 29 who did not want children had almost doubled. What lies behind this decision which seems to fly in the face of biology and society?Perhaps the most publicly outspoken childless couple are Ellen Peck and her husband William. They are not against parenthood but against the social pressures that push people into parenthood whether it is what they really want or not."It's a life-style choice," Ellen says. "We chose freedom and spontaneity (自发性), privacy (隐私) and leisure. It's also a question of where you want to give your efforts -- within your own family or in the larger community. This generation faces serious questions about the continuity of life on earth as well as its quality. Our grandchildren may have to buy tickets to see the last redwoods (红杉) or line up to get their oxygen ration (氧气). There are men who complain about being caught in a traffic jam for hours on their way home to their five kids but can't make the association between the children and the traffic jam. In a world seriously threatened by the consequences of overpopulation we're concerned with making life without children acceptable and respectable. Too many children are born as a result of cultural pressure. And the results show up in the statistics on divorce and child-abuse."17. The number of childless young couples ____.

Cathy and Wayne are in their late 20's, have been married five years, and are childless. The last time a member of Cathy's family asked, "When are you going to start a family?" her answer was, "We're a family!" Cathy and Wayne belong to a growing number of young married couples who are deciding not to have children. A recent survey showed that in the last five years the percentage of wives aged 25 to 29 who did not want children had almost doubled. What lies behind this decision which seems to fly in the face of biology and society? Perhaps the most publicly outspoken childless couple are Ellen Peck and her husband William. They are not against parenthood but against the social pressures that push people into parenthood whether it is what they really want or not. "It's a life-style choice," Ellen says. "We chose freedom and spontaneity (自发性), privacy (隐私) and leisure. It's also a question of where you want to give your efforts -- within your own family or in the larger community. This generation faces serious questions about the continuity of life on earth as well as its quality. Our grandchildren may have to buy tickets to see the last redwoods (红杉) or line up to get their oxygen ration (氧气). There are men who complain about being caught in a traffic jam for hours on their way home to their five kids but can't make the association between the children and the traffic jam. In a world seriously threatened by the consequences of overpopulation we're concerned with making life without children acceptable and respectable. Too many children are born as a result of cultural pressure. And the results show up in the statistics on divorce and child-abuse." 17. The number of childless young couples ____. A. is decreasing B. is increasing C. has more than doubled D. remains unchanged