Which of the following is NOT mentioned as a cause of the problem discussed in the passage?

题库:综合类 类型:最佳选择题 时间:2017-07-03 03:15:26 免费下载:《单选题》Word试卷

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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