单选题：Which of the following is NOT mentioned as a cause of the pr

题目分类：理工类
题目类型：单选题
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题目内容：

Which of the following is NOT mentioned as a cause of the problem discussed in the passage? A．Natural barriers to sea water have been destroyed.
B．The water table has gone down .after droughts.
C．Sea level has been continuously rising.
D．Evaporation of water leaves salt behind.

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