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:3,15,7,12,11,9,15,()。 A.6 B.8 C.18 D.19
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:1 5,7,12,11,9,1 5,()。 A.6 B.8 C.18 D.19
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7, 8, 11, 7, 15, (), 19,5 A.8 B.6 C.11 D.19
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1 5,7,12,11,9,1 5,()。 A.6 B.8 C.18 D.19
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15,7,12,11,9,15,()。 A.6 B.8 C.18 D.19
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2,3,5,7,() A.8 B.9 C.11 D.12
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3 15 7 12 11 9 15 ( )。 A.6 B.8 C.18 D.19