Prepare several balloons, including the red balloon (Le Ballon Rouge), and divide the remaining colorful balloons into two categories. Put out the knowledge you learned in class before the "Red Balloon" was blown in the form of questions and answers. In the activity, draw lots to choose the representative, step on the red balloon and let him answer questions. If he is right, let him step on one of the colorful balloons and receive the prize. If he is wrong, go to another pile of colorful balloons to watch the punishment. It was fun.