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

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题目类型：单选题
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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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请在第37处填上正确答案。

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