_______ you have visited the Great Wall, you can't imagine how great it is.
A:Because
B:Although
C:Unless
D:When
如图,在平面直角坐标系中,点A的坐标为(0,2),线段OA向右平移得到线段O′A′,点A的对应点A′在函数y=6x(x>0的图象上),则点O与其对应点O′之间的距离是( )
若 2×8n×16n=222 ,则n=____