Clouds are formed from . [br] This passage mainly discusses.A、water

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问题 Clouds are formed from ______. [br] This passage mainly discusses______.

选项 A、water conservation
B、the hydrologic cycle
C、underground water
D、polluted ground water

答案 B

解析主旨题。本题要求回答“这篇文章主要讨论了什么?”从全文对水蒸气、海洋水、陆地水的介绍可以看出，本文主要是讲水的循环，所以答案选B。

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Clouds are formed from ______. [br] This passage mainly discusses______.A、water