When a standard die is unfolded, faces adjacent to each other in a linear arrangement are opposite. In the given figure, faces with 1, 2, and 3 dots are adjacent to the face with 4 dots. Similarly, faces with 2, 3, and 5 dots are adjacent to the face with 1 dot. By observing the relative positions of the faces, the face with two dots is opposite to the face with a single dot.