单选题
小明想要绘制如图所示的图形，已知指令如下，大圆的半径为70，小圆的半径为50，请问横线处需要补充的指令依次是？（）
import turtle "red",70,"blue",50 "blue",70,"red",50 "red",50,"blue",70 "blue",50,"red",70
turtle.fillcolor(____)
turtle.begin_fill()
turtle.circle(____)
turtle.end_fill()
turtle.fillcolor(____)
turtle.begin_fill()
turtle.circle(____)
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