填空题
A.4,5,6,4,5,6, B.1,2,3,4,5,6, C.4,5,6,1,2,3, D.6,5,4,3,2,1,
A.1,2,3,4,5,6,7,8,9,10, B.10,9,8,7,6,5,4,3,2,1, C.2,3,1,6,8,7,5,4,10,9, D.10,9,8,7,6,1,2,3,4,5,