（2015•威海）已知：抛物线l₁：y=﹣x²+bx+3交x轴于点A，B，（点A在点B的左侧），交y轴于点C，其对称轴为x=1，抛物线l₂经过点A，与x轴的另一个交点为E（5，0），交y轴于点D（0，﹣$\frac{5}{2}$）．

最近以来，福建沿海地区频频发生因食用麦螺而中毒甚至死亡的事件。这是赤潮导致一些藻类产生的毒素，通过食物链进入麦螺体内，使昔日的美味佳肴成了人们餐桌上的“杀手”。

赤潮也危及到闽江口湿地。福州市仓山区南台岛东南端的道庆洲、草洲等地，是闽江口的低盐沼泽湿地，这里的动植物资源曾经十分丰富。由于各种污水排放日益严重，湿地的水质污染加剧，生物多样性发生了较大变化，一些湿地濒临消失……

下图显示闽江口湿地不同区域生物物种的生存现状。请回答下列问题：

①《中华人民共和国土地改革法》公布 ②人民公社化运动 ③农业生产合作化 ④家庭联产承包责任制

    Long long ago, there was a man living in a village with his wife and two children. They had a hen. It laid a golden egg every day. The man sold the golden egg and the family lived a rich and comfortable life.

    But the man was very greedy (贪婪的). He wanted to get all the golden eggs from his hen at a time. So, he thought hard every day about how to achieve it and he got a plan at last. He decided to kill the hen and get all the eggs. He didn't want to tell his wife about the plan because he wanted to give her a big surprise. He was so excited about his great plan. He even started to sing when he thought of the plan.

    The next day when the hen laid a golden egg, the man couldn't wait to take a knife and cut its body open. However, there was nothing but blood(血液) all around. There weren't any eggs at all. He was very sad because he would not get even one egg now.

    Their life used to be comfortable with one egg a day, but now their life changed a lot.

    How silly he was!