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    17．There are sevencontinents（洲） in the world．

    分析 世界上有七大洲．

    解答 continents 考查名词．根据所给的汉语提示"洲"和空前的数词seven可知，此处应用名词复数形式，故填continents．

    点评 名词是中学英语的重要语法，解题时首先要根据语境和逻辑来推断出空所需要的词性，或者是根据句子结构的需要来推断词性，然后根据所给的汉语提示写出正确答案．

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