求翻译：　　One year, the first class had been studying chemistry for several __6_ when Miss Richards suddenly asked, "What is water? Who knows? 7__ up?"是什么意思？

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　　One year, the first class had been studying chemistry for several __6_ when Miss Richards suddenly asked, "What is water? Who knows? 7__ up?"

问题补充：

匿名	2013-05-23 12:21:38 一流的一年，已研究几个_ 6_化学理查兹小姐突然问，“水是什么？谁知道？7__吗？”

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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