(2015·徐州市高三考前信息卷)B.F.Skinner, the worldfamous psychologist, discovered that an animal rewarded for good behavior learns more rapidly than an animal punished for bad behavior. Later studies have shown that the same is true of human beings.
George is a section chief in charge of __1__ for an engineering company. One of his responsibilities is to __2__ that employees wear their hard hats when they are working. Whenever he __3__ workers who were not wearing hard hats, he would tell them with a lot of authority of the regulation and that they must obey. __4__， he threatened, they would have 10 percent of their bonuses taken away. As a result they would get silent and sometimes angry __5__， but often after he left, the workers would remove the hats.
