下图为某山地俯视图，读图完成小题。
张叔叔买来80棵树苗，栽种在一个正方形的菜园四周，每个角上有1棵树苗，每边有多少棵树苗?
How would you like if you were watching your favorite TV program and someone came into the room and just shut it off without asking you?
