题目内容
4．Our classroom is very clean but theirs is very dirty．分析 我们的教室很干净，但是他们的很脏．
解答 答案：dirty．
根据所给首字母提示结合表转折的连词but推测句意是"我们的教室很干净，但是他们的很脏．"，根据设空处前面的is very判断设空处缺少形容词，所填单词"脏的"是dirty，所以答案是：dirty
点评 做这类题型，首先根据所给单词首字母明确句子所要考查的单词的拼写，再结合相关语法知识对单词做出形式上的变化．
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