2. As shown in Figure 7, the shaded part is composed of three small squares on the grid paper, and such a pattern is called an "L-shape". Therefore, on a grid paper composed of $4 \times 5$ small squares, the number of different L-shape patterns that can be drawn is ( ) .
(A) 16
(B) 32
(C) 48
(D) 64
(2006, National Junior High School Mathematics Competition, Zhejiang Province Preliminary)
(提示: each $2 \times 2$ small square L-shaped pattern has four different ways to be drawn, and there are 12 different positions for the $2 \times 2$ small square patterns, so the number of L-shaped patterns in different positions is $12 \times 4=48$.)