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

分析 這個(gè)科學(xué)家已經(jīng)在他的研究領(lǐng)域提出一個(gè)新的理論．

解答 答案：theory，考查名詞的用法，由中文意思可知使用名詞theory，由前面冠詞a可知使用其單數(shù)形式，故答案為theory．

點(diǎn)評(píng) 考查詞匯的記憶，在平時(shí)的學(xué)習(xí)中，要對(duì)詞匯的應(yīng)用進(jìn)行積累．

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