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在一次教学活动中,教师先出示下列两图:然后问:左图有几个长方形?学生:有4个长方形。教师:右图有几个三角形?学生:有2个三角形。教师:只有2个三角形吗?学生:还有2个梯形。教师摇摇头,说:你
In a teaching activity, the teacher first shows the following two pictures: Then ask: What are the left rectangles? Student: There are 4 rectangles. Teacher: There are several triangles on the right? Student: There are 2 triangles. Teacher: Only 2 triangles? Student: There are 2 trapezoid. The teacher shook his head and said: you