【1】.2,3/2,10/9,7/8,18/25,( )
A.5/14 B.11/18 C.13/27 D.26/49
【2】.2,4,6,9,13,19,( )
A.28 B.29 C.30 D.31
【3】.21,28,33,42,43,60,( )
A.45 B.56 C.75 D.92
【4】.1,3,0,6,10,9,( )
A.13 B.14 C.15 D.17
【5】. 2, 2, 0, 7, 9, 9, ( )。
A.13 B.15 C.18 D.20