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    5．They don't know theimportance （important） of saving energy．

    分析 他们不知道节约能源的重要性．

    解答 答案：importance 考查单词填空．根据题干：the后面要用名词，important是形容词，名词是importance

    点评 解答此题的关键是根据语境推测要填内容表达的含义，然后能理解各选项内容，有时可能没有必要细细区分每个单词的含义，仅根据句子语气就可以判断出正确答案．

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