A:①②③④
B:①②④
C:①②
D:②③
如图为正三角形ABC与正方形DEFG的重叠情形,其中D、E两点分别在AB、BC上,且BD=BE.若AC=18,GF=6,则F点到AC的距离为____
____ (judge) from his ____ (excite) news, his friends have found the key to ____ (solve) the problem.
2×9+27=____