In the past, the global average temperature may have been 27℃. [br] Water vapor

游客2023-09-15 27

问题 In the past, the global average temperature may have been 27℃. [br] Water vapor plays almost no role in modern greenhouse warming.

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答案 Y

解析根据题干中的信息词water vapor和greenhouse warming定位到第二个小标题下的第二段，可知自然温室效应中最重要的气体是水蒸气，但水蒸气的聚集变化不大，所以水蒸气在由人类导致的现代温室变暖中几乎没起什么作用，故该句表述正确。

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