2. 外语
  3. Many big cities in the world__________( 正面临着淡水资源短缺的问题).

Many big cities in the world__________( 正面临着淡水资源短缺的问题).

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问题 Many big cities in the world__________( 正面临着淡水资源短缺的问题).
选项
答案are facing the problem of lack/shortage of water resources
解析 ①现在进行时态；②“短缺”lack/shortage；③“淡水资源”water resources。
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大学英语四级

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