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1,2,2,4,4,6,8,8,()。 A.12B.14C.10 D.16
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72,36,24,18,()。 A.12B.16C.14.4D.16.4
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1,3/8,1/5,1/8,3/35,() A.1/12B.1/16C.1/18D.1/24
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2,3,6,5,(),7,20。A.12B.11C.10 D.8
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2,8,4,6,3,()。A.18B.16C.14 D.12
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2,-6,8,-4,-8,()A.12 B.16 C.20 D.24
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2,-6,8,-4,-8,()A.12 B.16 C.20 D.24