请为我解答这个题目---**Question Stem:** 二、涂色部分占整个图形的几分之几？ (Translation: Second, what fraction of the entire figure is the shaded part?) **Figure 1:** Description: A rectangle divided vertically into 3 equal rectangular parts. The left and right parts are shaded, and the middle part is unshaded. Below the figure are blank spaces for a fraction: ( ) --- ( ) **Figure 2:** Description: A square divided into a 3x3 grid of 9 smaller squares. - The central square is fully shaded. - The four corner squares are each divided by a diagonal line. One triangular half of each corner square is shaded (specifically, the triangle in the bottom-right of the top-left square, the triangle in the bottom-left of the top-right square, the triangle in the top-right of the bottom-left square, and the triangle in the top-left of the bottom-right square). - The four middle squares on the sides are unshaded. Considering the whole figure divided into 9 equal squares: The shaded area is 1 full square (center) + 4 * (1/2) squares (corners) = 1 + 2 = 3 square units. The total area is 9 square units. The shaded fraction is 3/9, which simplifies to 1/3. Below the figure are blank spaces for a fraction: ( ) --- ( ) **Figure 3:** Description: A rectangle divided horizontally into 2 equal rectangular parts. The left part is shaded, and the right part is unshaded. Below the figure are blank spaces for a fraction: ( ) --- ( ) **Figure 4:** Description: A six-pointed star (hexagram) formed by two overlapping equilateral triangles. The figure is divided into 12 equal smaller triangles (6 outer triangles and a central hexagon composed of 6 inner triangles). The 6 outer triangles forming the points of the star are shaded. The central hexagon, composed of 6 inner triangles, is unshaded. Total equal parts: 12 triangles. Shaded parts: 6 triangles. The shaded fraction is 6/12, which simplifies to 1/2. Below the figure are blank spaces for a fraction: ( ) --- ( )