Heat-sealed cards. Mark the letter that matches the picture.

The heat-sealed cards are cards protected by a layer of transparent plastic, usually used to protect the content from external factors such as water and dust. They are used for various purposes such as business cards, certificates, and important documents. To conduct the activity "Point to the letter that matches the picture," you can present a set of pictures with multiple letter options, and participants are asked to point to the letter that matches the displayed picture. For example, if the picture is related to a heat-sealed card, the options can be: A, B, C, D, where participants choose the correct letter.