题目

 It’s helpful to put children in a situation ________ they can see themselves differently. A．that  B．when  C．which  D．where 答案：D,分别代表铁路和公路，点M、N分别代表蔬菜和杂货批发市场．现要建中转站O点，使O点到铁路、公路距离相等，且到两市场距离相等．请用尺规画出O点位置，不写作法，保留作图痕迹．