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    4．After losing his hearingin an accident last year，his grades slipped because he had difficulty understanding his teachers．

    分析 自从去年在一次事故中失去听力后，他因难以理解老师而成绩下滑．

    解答 答案是hearing．
    形容词性的物主代词his后面接名词．根据后文的difficulty understanding his teachers可知是他失去了听力．句意是：自从去年在一次事故中失去听力后，他因难以理解老师而成绩下滑．故答案是hearing．

    点评 本题考查首字母填空．首先要掌握句意，然后判断填写的单词及固定搭配，根据相关语法填写正确的答案．

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