题目

There are many thoughts on the origins of civilization. One of the major factors involved was the increase in population. The development of techniques, primarily irrigation and flood control, which permitted agriculture in special areas such as the flood plain of the Tigris and Euphrates rivers, made possible the support of large population. Once populations reach a certain number, the older pattern of social organization breaks down and new ones develop. Specifically the older system, whereby each individual participated in food production and maintained a similar standard of living and wher下图为“世界某科技公司的清洁能源开发计划图”。读下图，完成下列各题。【1】图中青藏高原B类能源丰富的主要原因是A. 空气稀薄，太阳能丰富 B. 纬度低，多晴朗天气C. 内陆地区，热力环流强 D. 高差大，河流流量大【2】图中C类能源丰富的主要原因是A. 西北风，风力大 B. 纬度低，多晴朗天气C. 内陆地区，热力环流强 D. 高差大，河流流量大