A:①②③
B:②③④
C:①③④
D:①②④
红红火火(AABB):____、____、____
水淋淋(ABB):____、____、____
已知△ABC的三边长a=3,b=5,c=6,则△ABC的面积为( )
More historical buildings in the old town will fall down________we try our best to protect them.