题目

阅读理解 There is no doubt that watching television andmovies can influence the way people behave. Moreover, it seems that people arespending more and more time watching some sort of entertainment, whether it isa television, a video tape or a DVD. Therefore, the effects of the visual mediacannot be ignored. One obvious effect of these media is that watching them persuades peopleto buy certain products. Television advertising is widespread nowadays, andeven movie theaters permit advertisements. Another way TV or movies affectpeople is that they give people either a broader view of the worl在数轴上，点A与表示的点的距离为3，则点A所表示的数是              ．