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17, 10, 9, 6, 1, 2, (. )。A.O B.1 C.2 D.3
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9,17,13,15,14,()A.13B.14C.13.5D.14.5
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1,2,1,6,9,10,()A.13B.12C.19 D.17
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9,17,13,15,14,()A.13B.14C.13.5 D.14.5
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1,3,O,6,10,9,()。A. 13B.14C.15 D.17
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9,17,13,15,14,()A.13B.14C.13.5D.14.5
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2,3,4,6,8,9,10,12,()。A.13B.14C.16D.18