执行如下代码: import turtle turtle.circle(100) turtle.circle(50,180) turtle.circle(-50,180) turtle.penup() turtle.goto(0,140) turtle.pendown() turtle.circle(10) turtle.penup() turtle.goto(0,40) turtle.pendown() turtle.circle(10) turtle.done() 在 Python Turtle Graphics 中,绘制的是 ()