How is the table salt we use obtained? What is the passage mainly about?

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问题 How is the table salt we use obtained?
What is the passage mainly about?

选项 A、How the precipitation or runoff is actually formed.
B、How the table salt we use is obtained.
C、The processes that cause a change in oceanic salinity.
D、The processes the dissolved materials are left behind.

答案C

解析主旨题。根据文章内容，我们知道文章主要讲的是引起海水含盐量变化的三个过程，所以选项C是正确答案。

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大学英语四级

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How is the table salt we use obtained? What is the passage mainly about?

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