36, 20, 16, 12, 6, ()。
A.0
B.2
C.4
D.6
1,2,3,6,12,() A.16;B.20;C.24;D.36
77, 49, 28, 16, 12, 2, () A.10 B.20 C.36 D.45
77, 49, 28, 16, 12, 2, ()。A.10 B.20C.36 D.45
77,49,28,16,12,2,()A.10B.20C.36 D.45
77,49,28,16,12,2,()。 A.10 B.20 C.36 D.45
77,49,28,16,12,2,()A.10B.20C.36D.45