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

    分析 翻译：空气污染是我们生活中最大的污染之一．

    解答 根据表范围词的"in our life"判断句子应使用最高级，big的最高级需双写g再加est，故答案为：biggest

    点评 本题考查形容词的最高级，做此类题的关键是到句中寻找最高级的特征词，如：in，of all，among，one of，the+序数词+最高级

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