2. 外语
  3. What does the passage mainly tell about? Scientists say that the salt in the ocean comes from______.

What does the passage mainly tell about? Scientists say that the salt in the ocean comes from______.

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问题 What does the passage mainly tell about?
Scientists say that the salt in the ocean comes from______.
选项 A、air
B、rocks
C、the earth
D、rain
答案B
解析 第二段提到科学家的解释：scientists will say that the salt comes from rocks，所以答案选B。
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