2. 外语
  3. Water on the earth is being continuously recycled in a process known as the hydrologic (水文的) cycle. The first step of the cycle

Water on the earth is being continuously recycled in a process known as the hydrologic (水文的) cycle. The first step of the cycle

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问题     Water on the earth is being continuously recycled in a process known as the hydrologic (水文的) cycle. The first step of the cycle is the evaporation (蒸发) of water in the oceans. Evaporation is the process of water turning into vapor, which then forms cl
选项 A、evaporation
B、water vapor
C、outer space
D、the hydrologic cycle
答案B
解析 细节题。本题要求回答“云是由什么形成的”，文章的第一段第三句话“Evaporation is the process of water turning into vapor，which then forms clouds in the sky. ”意思是：蒸发是水转化为蒸汽的过程，这个过程使得云在天空中形成。因此，应选择答案“水蒸气”，故选B。
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本试题收录于： 大学英语三级B级题库大学英语三级分类
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