着温室效应和能源紧缺的状况越来越突出，风力发电作为一种清洁能源越来越受到人们的推崇。图中①②③④地最适宜兴建风力发电站的是A．①B．②C．③D．④6．下列有关甲、乙两省（区）叙述正确的是A影响两省（区）环境承载力差异的主要原因是土地资源数量的多少B．两省（区）风能资源都很丰富，但风力较大的季节不同C．N河流量的季节变化大予M河，年际变化小于M河D．甲乙两省（区）均有丰富的太阳能和天然气资源下图为（19511994年）我国部分地区的冬季冷冻灾害频次图，读图回答第7题。
7．图中A、B两地比较，B地冬季冻害严重，其原因为①B地位于山前地带，南下寒冷气流受山地阻挡在此滞留②B地冬季受冷空气影响的频率比A地高

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