问题
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2/3,1/2,3/7,7/18,() A.5/9;B.4/11;C.3/13;D.2/5
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3,3,4,5,7,7,11,9,()A.13,11 B.16,12 C.18,11 D.17,13
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2/3, 1/2, 3/7, 7/18,() A.5/9 B.3/13 C.4/11 D. 2/5
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3,3,4,5,7,7,11,9,() A.13,11 B.16,12 C.18,11 D.17,13
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3,3,4,5,7,7,11,9,(),()A.13.11 B.16,12C.18,11D.17,13
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3,3,4,5,7,7,11,9,()A.13 B.16C.18D.17