题目

House fires often happened. So it appears necessary to learn something useful to protect family from them. The following poster in the neighbourhood will tell you how to do it.Fire SafetyPut a smoke alarm in your house and test it every month. Half of all house fire deaths happen between 11 pm and 7 am. The risk of dying in a house fire is cut in half with working smoke alarms.Make sure your hearing aid, wheelchair or eyeglasses are next to your bed. Fire can spread through a house soon. You may have as little as two minutes to escape (逃离) safely. Be ready to act at once.Create a fire esca（2012?新化县二模）下列物品中，物质硬度最大的是（　　）A．刀片B．粉笔C．铅笔芯D．塑料尺