如图:小明从点A出发,沿直线前进5m后向左转30°,再沿直线前进5m后,又向左转30°,照这样方式走下去,他第一次回到出发点A时,一共走了( )
A:50m
B:60m
C:70m
D:80m
— _____bag is this?
— It's Daming's. ( )