问题
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2,4,6,9,13,19,()A. 28 B. 29 C. 30 D. 31
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4,6,5,7,7,9,11,13,19,21,() A. 27,29 B. 32,33 C. 35,37 D.41,43
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1/4,2/7,2/5,8/13,1() A.9/16 B.3 C.32/19 D.28/17
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4,6,5,7,7,9,11,13,19,21,(),() A.27,29 B.32,33 C.35,37 D.41,43
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2,4,6,9,13,19,() A. 28 B. 29 C. 30 D. 31
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2,4,6,9,13,19 ()。A. 28B. 29C. 30D. 31