What does the passage mainly discuss? All of the following are processes that decrease salinity EXCEPT______.

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问题 What does the passage mainly discuss?
All of the following are processes that decrease salinity EXCEPT______.

选项 A、evaporation
B、precipitation
C、run off
D、melting

答案A

解析文中第一段第三句说，导致海水盐度变化之一的是通过蒸发使水浓缩。第四句说，通过这种方式，海水含盐度将升高。题目问的是以下哪项不能使含盐度降低，可知A4“蒸发”符合题意。

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