8. A uniform cube has the numbers $1,1,2,3,3,5$ marked on its six faces as shown in Figure 4. When this cube is rolled once, the number on the top face is recorded as the x-coordinate of a point in the Cartesian coordinate system, and the number on the bottom face is recorded as the y-coordinate of that point. According to this rule, each roll of the cube yields a point in the plane. It is known that the two points obtained by Xiao Ming in his first two rolls determine a line $l$, and this line $l$ passes through the point $P(4,7)$. Therefore, the probability that the point obtained by his third roll also lies on the line $l$ is ( ).
(A) $\frac{2}{3}$
(B) $\frac{1}{2}$
(C) $\frac{1}{3}$
(D) $\frac{1}{6}$
8.A.

Each throw may result in 6 points with coordinates (two of which are overlapping): $(1,1),(1,1),(2,3),(3,2),(3,5)$, $(5,3)$. By plotting the points and calculation, it can be found that the line determined by any two of the three points $(1,1)(2,3)$, $(3,5)$ passes through point $P(4,7)$. Therefore, the probability that the point obtained by Xiao Ming's third throw is also on line $l$ is $\frac{4}{6}=\frac{2}{3}$.