选择题
2015 AMC 8 Problem 12: Parallel Edges of a Cube
How many pairs of parallel edges, such as AB and GH or EH and FG, does a cube have?
2015 AMC 8 第12题：立方体的平行边
正方体有多少对平行边，例如AB和GH或EH和FG
A.
6
B.
12
C.
18
D.
24
E.
36