题目

Air pollution is a big problem for cities. Many people are dying from it. But how can we tell the air quality(质量) is good or bad?Joris Lam has invented a birdhouse that can tell us about the air quality. On a tree next to a canal (运河) in Amsterdam, a small birdhouse will shine bright green when the air is clean. If you are standing near the birdhouse, it will also give you a free Wi-Fi connection. So Joris’s birdhouse is called TreeWifi. It can be put on a tree around your house to test the air quality. People can see a screen with information about local air quality and how to impro钢铁厂于19世纪初建在M地，20世纪80年代将炼铁厂从M地迁至N地，炼钢厂仍留在M地，如下图所示，该钢铁厂所用的铁矿石一直依赖进口，图中河流可以通航。据此回答9～10题。 9．该钢铁厂最初选择建在M地的有利条件有(　　) ①接近燃料地  ②接近铁矿 ③接近消费市场  ④廉价劳动力充足 A．①③　　　                                               B．③④　　　 C．②④　　　                                               D．①④ 10．该钢铁厂将炼铁厂迁至N地，可以降低(　　) A．燃料运输费用                                          B．铁矿石运输费用 C．产品运输费用                                          D．废弃物的排放量