The best title for this passage is . Clouds are formed from .

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问题 The best title for this passage is ______.
Clouds are formed from ______.

选项 A、water vapor
B、evaporation
C、the hydrologic cycle
D、groundwater

答案A

解析从文章第一段第三句：“．．．water turning into vapor which then forms clouds in the sky．．．”可推出云是由水蒸气形成的。故应选A。

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公共英语二级笔试

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