單項(xiàng)選擇題1.5,4.5,13.5,16.5,()

A.21.5
B.34.5
C.49.5
D.47.5


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1.單項(xiàng)選擇題-1,6,-15,28,()

A.-45
B.45
C.35
D.-35

2.單項(xiàng)選擇題7,14,10,11,14,9,(),()

A.19,8
B.18,9
C.17,8
D.16,7

3.單項(xiàng)選擇題7,23,55,()

A.108
B.109
C.110
D.121

4.單項(xiàng)選擇題6,7,3,O,3,3,6,9,()

A.5
B.6
C.7
D.8

5.單項(xiàng)選擇題28,18,32,14,36,10,()

A.42
B.40
C.6
D.4