44.结论1:20世纪60年代,西居延海和东居延海相继干涸对当地生态环境带来了不利影响。(1分)论证:西居延海和东居延海相继干涸,会减少流域实际蒸发量,气候趋于干燥,沙尘暴等恶劣天气多发;(3分)西居延海和东居延海相继干涸会使水生生物群落消失,生物多样性减少,物种灭绝,生态平衡失调;(3分)西居延海和东居延海相继干涸使地下水位下降,严重影响湖岸植物生长,地面裸露,风蚀作用增强,土地趋于沙化。(3分)结论2:通过采取有效措施可以让东居延海重现波涛滚滚的景象。(1分)论证:通过采取统一管理、调度、控制流域内的水资源,制定合理、节约、有效利用水资源的措施,可以增加黑河径流量,进而增加入湖水量;(3分)通过营造防风固沙林、水源涵养林,保护绿洲,治理土地沙漠化,改善局部小气候等措施,可以增加流域降水量,增加湖泊的雨水补给和河流补给:(3分)通过调整农业结构,发展节水农业,加大中下游生态用水比重的措施,可以增加入湖水量。(3分)

书面表达Dear sir or madamI am Li Hua, a middle school student from China who is crazy about differentcultures around the world. Recently, I learned on your official website that therell be a summer camp in my city. I'm writing to participate in it.First, having learned English for almost ten years, I can speak English flu-ently. Moreover, with the development of China, there are more and more young-sters who show great interest in Chinese culture and this is really a wonderfulportunity for us to communicate the different cultures with each other, I will he a-hle to learn from other cultures to broaden my horizons and spread Chinese cultureI hope I can he accepted as a member in your summer caLooking forward to your reply.RegardsLi H

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