单项选择题
A.27B.45C.49D.56
1,3,4,6,11,19,()A.21B.23C.25D.34
单项选择题1,3,4,6,11,19,()
A.21 B.23 C.25 D.34
18,9,4,2,(),1/6A.3B.2C.1D.1/3
单项选择题18,9,4,2,(),1/6
A.3 B.2 C.1 D.1/3
6,4,8,9,12,9,(),26,30A.12B.16C.18D.22
单项选择题6,4,8,9,12,9,(),26,30
A.12 B.16 C.18 D.22