请以资深中国数学教师的身份，解析图片上习题的答案，要求讲解过程图文并茂，用不同的颜色标注，语言风格风趣幽默，简单易懂。---**Extraction Content:** **Question Stem:** 如左下图所示为一个正方体展开图的 5 个面, 再在 ( ) 的位置添一个面, 就可补全这个正方体的展开图。 *(Translation: The figure below shows 5 faces of a net of a cube. Add one more face at position ( ) to complete the net of this cube.)* **Options:** A. ① B. ② C. ③ **Chart/Diagram Description:** * **Type:** Geometric figure (Net of a cube) * **Main Elements:** * A partial net of a cube consisting of 5 connected squares. The arrangement is one square on top, connected to the middle of a row of three squares, with the fifth square attached below the rightmost square of the row of three. * There are three locations marked with dashed boxes and circled numbers: * Position ①: Above the leftmost square of the row of three squares. * Position ②: To the left of the leftmost square of the row of three squares. * Position ③: Below the rightmost square of the row of three squares. * The existing 5 squares form an L-shape with an extra square on top of the corner of the L. Specifically, from left to right, there are 3 squares in a horizontal row. A fourth square is directly above the second square from the left in this row. A fifth square is directly below the third square from the left in this row. * Position ① is above the first square from the left in the horizontal row. * Position ② is to the left of the first square from the left in the horizontal row. * Position ③ is below the third square from the left in the horizontal row.