人们常在田间喷洒一定量的性外激素，干扰了蛾蝶类害虫雌雄个体间的通讯，这是利用了动物的（ ）

   A small town named Bundanoon in Australia has decided to stop the sale of bottled water(瓶装水). They say that bottled water can cause environmental problems. Too many resources(资源) are used to make bottled water. When people finish drinking the water, the bottles will be thrown away and go into dustbins. So they require local people in the town to stop buying bottled water and use tap water to drink. Visitors are encouraged to get water from water stations in the main streets, and fill the water in bottles that can be used again. The decision has been supported(支持) by all the shopkeepers in the town. Bundanoon is the world’s first town that has got its shop selling bottled water. Probably we should follow the example. Let’s stop buying bottled water and use tap water！

已知关于x的一元二次方程x²﹣4x+m=0．

我们生活中出现了“最美教师”、“最美司机”等很多最美人物，他们不仅组成了一道亮丽的风景线，更是中华民族的道德形象。他们留给我们的，除了感动，更是人性的真善美。最美人物身上值得我们学习的优秀品质有（  ）
①爱岗敬业，无私奉献
②助人为乐，关爱他人
③强烈的社会责任感
④善良大爱