题目

根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。If you are in a crowd, the first and most important thing is to make yourself familiar with your surroundings and mentally notice alternate exits.__ 【1】___Make yourself aware of the type of ground you are standing on, and know that in a crowd of moving people wet or uneven ground can be slippery or hazardous, causing you to fall._【2】__ When in danger, a few seconds can make all the difference, giving you the possibility of taking advantage of escaping route. 阅读材料，回答下列问题。材料一　下图为某区域图。克拉斯诺亚尔斯克市是俄罗斯远东地区的新兴重工业城市，位于叶尼塞河和西伯利亚铁路的交会点，市西南有俄罗斯规模较大的水电站——克拉斯诺亚尔斯克水电站。材料二　下图为某时段鄂毕河①②③④河段水温变化情况示意图。(1)归纳图中北部地区河流的共同特点。(2)据材料二说明此时段①②③④河段哪段最易发生凌汛，并分析其原因。(3)说出克拉斯诺亚尔斯克发展炼铝业的有利条件。