What does the passage mainly tell about? Without______, it would be impossible for the salt from rocks to get to the ocean.

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问题 What does the passage mainly tell about?
Without______, it would be impossible for the salt from rocks to get to the ocean.

选项 A、rain
B、earth
C、rivers
D、both A and C

答案D

解析 文章提到盐的运动过程是:The rain then carries the salt into the earth and into the rivers.The rivers carry the salt into the ocean。所以rain和river都不可缺少。
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