题目内容
12．It's rude to talk back to your teacher．分析 跟老师顶嘴是无礼的．
解答 答案：rude．
根据所给首字母提示结合语境推测句意是"跟老师顶嘴是无礼的．"，根据设空处前面的系动词is判断设空处缺少形容词，所填单词"无礼的/粗鲁的"是rude，所以答案是：rude
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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