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请根据下面的图文资料，回答问题． 材料一 2006年7、8月份，我国四川和重庆地区出现持续大旱．气象学家分析，其中一个重要原因是西侧高原积雪偏少． 材料二 中国沿32°N纬线地形剖面图 （1）请简要分析材料一中高原积雪偏少的主要原因中______． （2）5?12汶川地震发生在材料二中______（填数字）地形区的西侧．有一批救灾物资就近从济南运往灾区，经过的铁路干线依次是京沪线-陇海线-______线． （3）材料二中③地形区上有我国到2010年将形成的四大高新技术产业密集区之一的______ （4）图中所示地势特点对我国气候的有利影响是什么？
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