單項選擇題1,1,-1,-5,( )

A.-1
B.-5
C.-9
D.-11


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1.單項選擇題4,4,2,-2,( )

A.-2
B.-4
C.-8
D.-16

2.單項選擇題6,18,( ),78,126

A.40
B.42
C.44
D.46

3.單項選擇題-2,-4,6,8,-10,-12,14,16,( ),( )

A.-17,-18
B.17,18
C.-18,-20
D.18,20

4.單項選擇題12,13,15,18,22,( )

A.25
B.27
C.30
D.34

5.單項選擇題18,-27,36,( ),54

A.44
B.45
C.-45
D.-44