1.1,2,1,6,9,10,( )。
A.13
B.12
C.19
D.17
2.2,3,5,14,69,( )
A.99
B.498
C.965
D.1517
3.10,2,-2,-4,( )
A.-2
B.-5
C.-6
D.-8
4.3/5,4/7,7/11,12/17,19/25,( )
A.28/35
B.26/35
C.28/37
D.26/37
5.1/2,1/8,1/24,1/48,( )。
A.1/96
B.1/48
C.1/64
D.1/81
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