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5.已知数列\an\的前n项和为Sn,Sn=an+1,a2=-2,,则λ等于A.1或2B.2C.1D.2或
21.Which camp is suitable for the 5-year-olds?A.Ivy Academy. B.Beijing Playhouse.C.That's Mandarin. D.Prestige Education Centre.