11,13,17,19,23,()
A.27
B.29
C.31
D.33
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11, 13, 17, 19, ()。 A.21B.23C.27D.29
31 29 23()17 13 11 A.21B.20C.19D.18
31,29,23,(),17,13,11。 A.21B.20C.19D.18
13, 17, 21, 25, (), 33。A.27 B.29 C.31 D.32
(),11,13,17,19,23A.6B.8C.7D.9
13,17,21, 25,(),33。A.27 B.29 C.31 D.32