單項(xiàng)選擇題12,4,8,6,7,()

A.6
B.6.5
C.7
D.8


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1.單項(xiàng)選擇題-2,3,-1,5,3,13,()

A.21
B.28
C.18
D.19

2.單項(xiàng)選擇題2,6,15,30,45,()

A.63
B.57
C.51
D.45

3.單項(xiàng)選擇題3,13,53,129,247,()

A.413
B.365
C.498
D.516

4.單項(xiàng)選擇題44,52,68,76,92,()

A.104
B.116
C.124
D.128

5.單項(xiàng)選擇題2,-2,6,-10,22,()

A.-36
B.-40
C.-42
D.46