A . -53
B . -21
C . 21
D . 53
[单选题]1,6,6,11,16,26,41,()A.48B.51C.56D.66
[单选题]26,11,31,6,36,1,41,( )。A.0B.-3C.-4D.46
[单选题]11, 13, 16, 21, 28, ( )A.37 B.39C.41 D.47
[单选题]11, 13, 16, 21, 28, ( )A.37B.39C.41D.47
[单选题]11,13,16,21,28,( )A.7 B.39 C.41 D.47
[单选题]27,11,16,5,11,6,( )。A.5B.9C.13D.17
[单选题]1/2, 1/2, 1/2,7/16,11/32,( )A. 15/64B. 1/4C. 13/48D. 1/3
[主观题]1,1,8,16,7,21,4,16,2,()A.10;B.20;C.30;D.40;
[主观题]1,1,8,16,7,21,4,16,2,()A.10;B.20;C.30;D.40;
[单选题]:1,11,21,31,( )。A.39B.41C.51D.49