Positive reinforcement, also known as "positive reinforcement," refers to the process by which an individual makes a certain behavior or reflects a subsequent or simultaneous reward, thereby increasing the behavior or reflection intensity, probability, or speed. It can also be said that positive reinforcement is by increasing A favorite stimulus to increase the probability of an event. According to the above definitions, Which of the following are positive reinforcements:. ['Xiaoming thinks Uncle Astronaut on TV is cool, he is determined to study hard, and he will go to space when he grows up.', 'Teacher inspires students to review their exams, and promises that students who have a score of 95 or above in mathematics may not do their homework.', 'In a middle school, students who use mobile phones in class are confiscated. After the implementation, almost no one dares to play mobile phones.', 'In order to encourage his son to study hard, Father D promised that if he could be admitted to the top three in the class, he would take him abroad to travel.']