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Lesson 21,Triangle, rectangle, square,冀教版（一起）一年级英语下册,Shape eip,Rectangle rektl,Square skw,Triangle trail,square,rectangle,triangle,Play with the shapes.,The door is a rectangle.,The window is a square.,Whats this?Its a house.What shapes are they?They are a triangle and several rectangles.,Homework：,听课文录音磁带，并跟读。熟记下列单词： triangle, rectangle, square,GOODBYE！,
