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

分析 自從去年在一次事故中失去聽力后，他因難以理解老師而成績下滑．

解答 答案是hearing．
形容詞性的物主代詞his后面接名詞．根據(jù)后文的difficulty understanding his teachers可知是他失去了聽力．句意是：自從去年在一次事故中失去聽力后，他因難以理解老師而成績下滑．故答案是hearing．

點評 本題考查首字母填空．首先要掌握句意，然后判斷填寫的單詞及固定搭配，根據(jù)相關(guān)語法填寫正確的答案．

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