题目内容
6．It's important to brush yourteeth（tooth） twice a day．分析 每天刷牙两次很重要．
解答 答案：teeth 考查单词填空．根据句意每天刷牙两次很重要．要用tooth的复数形式 teeth
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．
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