3656 . 单选题 Puls

下面Python代码执行后输出的是?

import turtle
for i in range(4):
    turtle.left(180)
if i % 2 == 0:
    turtle.color("red")
else:
    turtle.color("blue")
if i < 2:
    turtle.circle(25)
else:
    turtle.circle(50)