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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