______是中国古代建筑中等级最高的屋顶形式。
A.http://edu-image.nosdn.127.net/7799A2FF4A2810BB7D7F8880173764C1.jpg?imageView&thumbnail=890x0&quality=100
B.http://edu-image.nosdn.127.net/2380012151947A77F9EBA5A356C5A473.jpg?imageView&thumbnail=890x0&quality=100
C.http://edu-image.nosdn.127.net/66455ECBC9011FA8A02D41B66C720DCD.jpg?imageView&thumbnail=890x0&quality=100
D.http://edu-image.nosdn.127.net/DCCF80C40CD8224B97DFFC175C853C76.jpg?imageView&thumbnail=890x0&quality=100