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    18．The scientist has put forth a newtheory（理论） in his research field．

    分析 这个科学家已经在他的研究领域提出一个新的理论．

    解答 答案：theory，考查名词的用法，由中文意思可知使用名词theory，由前面冠词a可知使用其单数形式，故答案为theory．

    点评 考查词汇的记忆，在平时的学习中，要对词汇的应用进行积累．

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