Whatismostimportantwhenlaunchingnewproducts,flankerbrandsextensionsofwell-knownbrands,orinfrequentlypurchasedbrands;orgoingafteranundefinedtargetmarket.（）
Adultssometimesenvychildrenwhoplayallthetime____theythemselveshavetowork.rainorshine.
Asthenumberofparticipantshasincreasedfrom60to98,wewonderifwecanuseLectureHall'A'as'B'willbetoosmall.