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PASSAGE FOUR What does the passage mainly tell us?

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问题 PASSAGE FOUR
What does the passage mainly tell us?
选项
答案Warmer climate could cause a dramatic impact on water resources．
解析 该题为主旨大意题。根据全文可知，即使温室效应导致气温上升1至2摄氏度，也会对北美西部的水资源产生巨大影响。对该地区气候进行了模拟研究的科研小组警告说，在21世纪，随着气温逐渐上升，积雪场将大幅度减少，洪水泛滥将更为严重。
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