It's Sunday afternoon. The weather is fine. There is a football match between class 2 and class 4. Many students are watching. They're excited. Now, Zhang Wei has the ball. He passes it to Wei Kun. But Wei Kun can't kick the ball. Then John has the ball. The ball flies to Zhang Wei's arm. Zhang Wei is very angry. The ball files into the goal. How is Zhang Wei feeling? He is so happy! Class 4 won the game. Class 2 is very sad.

材料一：匹兹堡位于美国东北部五大湖区，曾有“世界钢铁之都”之称。20世纪50年代以来，匹兹堡失去昔日的辉煌，其铜铁产品在国内市场的占有率大幅下降。为了改变衰退的局面，匹兹堡推出庞大的复兴计划。进入21世纪，匹兹堡已转型为以生物技术、计算机技术、机器人制造、医疗健康等闻名的工商业城市，成为美国城市经济转型的典范。

材料二：下图为美国部分区域略图。20世纪30年代，图中大平原地区曾经历过对农业资源的掠夺式开发，引发一系列严重恶果。