1, 2, 12, 3, 4, ()。
A.5
B.14
C.24
D.34
1,2,2,6,3,15,3,21,4,() A.46;B.20;C.12;D.44;
4/9,1,4/3,(),12,36 A.2;B.3;C.4;D.5;
1/2,4/3,5/6,1/2,().A.10/11B.7/54 C.1 D.5/12
12,2,2,3,14,2,7,1,18,3,2,3,40,10,(),4 A.4 B.2 C.3 D.1
12, 3,4, 2, 2, 1, ()。A.4 B.8 C.1 D.2
12, 3, 4, 2, 2, 1,()。A.4 B.8 C.1 D.2