单项选择题
A.2,4,3,9,12,12,11,11,18,9, B.3,4,2,7,9,8,6,5,11,10, C.2,3,1,6,8,7,5,4,10,9, D.1,2,3,6,8,7,5,4,10,9,
A.24 B.28 C.32 D.36