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5,17, 21, 25,() A、29;B、36;C、41;D、49
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2, 5, 10, 17, 26, () A.29 B.33 C.37 D.41
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2, 5, 10, 17, 26, () A.29 B.33 C.37 D.41
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3,5,9.17,()。 A.25 B.29 C.33 D.41
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29,21,15,(),9。 A.17 B.11 C.25 D.7
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13, 17, 21, 25, (), 33。A.27 B.29 C.31 D.32
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13,17,21, 25,(),33。A.27 B.29 C.31 D.32