题目

阅读理解According to the majority ofAmericans, women are every bit as capable of being good political leaders as men.The same can be said of their ability to dominate the corporate boardroom. And accordingto a new Pew Research Center survey on women and leadership, most Americans findwomen indistinguishable from men on key leadership traits such as intelligence andcapacity for innovation, with many saying they're stronger than men in terms ofbeing passionate and organized leaders.So why, then, are women in shortsupply at the top of government and business in the United States? According to已知平行四边形ABCD的周长为56，AB=12，则BC的长为(　　)A.4B.16C.18D.24