Unintentional attention means that there is no predetermined purpose, no will effort, and involuntary attention to a certain thing. When unintentional attention, the direction and concentration of certain activities by psychological activities are caused by some subjective and objective conditions. According to the above definition, Which of the following are not unintentional:. ['During the class, the students were suddenly attracted by the butterflies flying in the window.', 'hungry Xiaoming, saw the bread on the table as soon as he entered the room.', 'Xiaohong dived into her homework and unknowingly passed a long time.', 'People saw small red flowers at a glance on the green grass.']