问题
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1,9,7,4,8,5,(),11 A、3 B、4 C、5
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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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2/3, 1/2, 3/7, 7/18,() A.5/9 B.3/13 C.4/11 D. 2/5
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2/3 ,1/2 ,5/9 ,(),11/15 A.2/5 B.6/11 C.3/4 D.7/12
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2/3, 1/2, 2/5, 1/3, 9/7,().A.1/4 B.1/6C.2/11 D.2/9
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2/3, 1/2, 2/5, 1/3, 9/7,().A.1/4 B.1/6C.2/11 D.2/9