由此推理()
A.2 B.3 C.4 D.5
单项选择题1 2,1 5,1 10,1 17,()
A.1/23 B.1/26 C.1/31 D.1/37
单项选择题13,56,15,17,(),21
A.68 B.76 C.80 D.86
单项选择题8,9,5,12,14,15,12,17,15,8,13,()
A.10 B.12 C.14 D.20
单项选择题3,9,11,17,20,26,30,()
A.21 B.24 C.36 D.38