8．Air pollution is one of thebiggest（big） problems in our life．

分析 翻譯：空氣污染是我們生活中最大的污染之一．

解答 根據(jù)表范圍詞的"in our life"判斷句子應(yīng)使用最高級(jí)，big的最高級(jí)需雙寫(xiě)g再加est，故答案為：biggest

點(diǎn)評(píng) 本題考查形容詞的最高級(jí)，做此類(lèi)題的關(guān)鍵是到句中尋找最高級(jí)的特征詞，如：in，of all，among，one of，the+序數(shù)詞+最高級(jí)

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