Which of the following is NOT mentioned as a caus
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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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答案：C
引起盐分渗入土壤的3个原因都在第四段里谈到了：第一是阻挡海水的天然屏障红树林被砍伐（A)；第二是在地中海地区严重的旱灾导致水平面下降，海水渗透（B); 第三是在拉丁美洲，水分被高温蒸发后留下了盐分（D)。