A Trip to the Forest
   One day Bob took two of his friends into the mountains. They put up their tents and then rode off to a forest to see how the trees were growing.
   In the afternoon when they were about ten kilometres from their camp（营地）, it started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp, and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp?
   Bob had an idea. The horses! Let the horses take them back! But what would happen if the horses took the road to his house? That would be a trip of thirty-five kilometres in such cold weather!
   It was getting late. They rode on and on. At last the horses stopped. Where were they? None of them could tell. John looked around. What was that under the tree? It was one of their tents!

在新一轮援疆建设中,江苏人突破“交钥匙”“交支票”的传统援建模式,构建了支援方和受援方团结合作、协同推进的新机制,使受援地掌握了先进的管理理念、工作方法,增强了“造血”机能。江苏新一轮援疆建设思路体现了（  ）

①系统优化的方法　②统筹全局,实现整体最优目标　③搞好局部,用局部的发展推动整体的发展　④辩证法的革命批判精神和创新意识

冰雹灾害是由强对流天气系统引起的一种剧烈的气象灾害，会对人们的生产生活产生巨大的危害。下图为某区域冰雹次数等值线（单位:次/年）分布图。