执行下面程序后,画布上会出现几只海龟?( )
import turtle t1=turtle.Turtle('turtle') t2=turtle.Turtle('turtle') t3=turtle.Turtle('turtle') t4=turtle.Turtle('turtle') t1.forward(50) t2.forward(100) t3.forward(150) t4.forward(200)
0
1
4
5