如图，在正方形ABCD中，点E是BC上一点，连接AE．请添加一条线段，使得图形是一个轴对称图形．（要求：画出示意图，并作出对称轴）

初中生小李看到一辆货车违章高速行驶，把一骑自行车的妇女撞倒。小李见状高喊停车救人，货车司机却加大油门逃跑。小李记下肇事货车的车号，并拦下一辆汽车，将妇女送往医院。对此，下列表述错误的是（  ）

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如图是饭后半小时，进出人体某器官血液的四种物质相对含量直方图．该器官是（　　）