A much-hyped rescue on "Lost",an all-star,and a host of blockbuster movies-of-the-week can only mean that the networks are using shameless stunts to get viewers to tune in.Broadcasters use the viewership numbers collected during four annual periods to set advertising rates for the rest of the year.In other words,_____ commonly co-occur when networks are trying to make themselves look attractive to advertisers.

Question

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Sweeps occur four times a year.They are the periods of the year in which Nielsen gathers audience rating data.

A Much-Hyped Rescue on "Lost",an All-Star,and a Host of Blockbuster