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  3. They would know that in very cold conditions water becomes a solid called ice and that when heating on a fire it becomes a vapor

They would know that in very cold conditions water becomes a solid called ice and that when heating on a fire it becomes a vapor

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问题 They would know that in very cold conditions water becomes a solid called ice and that when heating on a fire it becomes a vapor called steam.
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答案语态错误，应把heating改为heated。
解析 在时间、条件、让步等状语从句中，当从句主语和主句主语一致时，可以将从句主语和be动词省略。此题后一个分句就是将when ice is heated on a fire中的ice is省略了，所以应该用过去分词表示被动。
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