A . 26
B . 25
C . 3
D . 21
[单选题]2 , 10 , 5 , 25 , 9 , 45 , 3 , ( )A. . 17B. . 20C. . 2D. . 15
[单选题]2/3, 1/2, 2/5, 1/3, 9/7,( ).A.1/4B.1/6C.2/11D.2/9
[单选题]0,7/3 ,22/5 ,45/7 ,76/9 ,( )A.12B.13C. 103/11D. 115/11
[单选题]:2,3,5,9,17,( )。A.27B.30C.33D.35
[单选题]2,3,5,9,( ),33。A.15B.17C.18D.19
[单选题]2,3,5,9,( ),33。A.15B.17C.18D.19
[单选题]2,3,5,9,( ),33。A.15B.17C.18D.19
[单选题]2,3,5,9,( ),33。A.15B.17C.18D.19
[单选题]2,3,5,9,( ),33。A.15B.17C.18D.19
[单选题]2,3,5,9,( ),33A.15B.17C.18D.19