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2．Scientists have made a major breakthrough （突破） in the treatment of cancer．

分析科學(xué)家在癌癥治療方面取得了重大突破．

解答答案：breakthrough
考查名詞．根據(jù)所給的漢語提示"突破"和空前的形容詞major可知，此處應(yīng)用名詞形式，結(jié)合前面的冠詞a，所以應(yīng)用名詞單數(shù)形式，"突破"的英語是breakthrough，故填breakthrough．

點評名詞是中學(xué)英語的重要語法，解題時首先要根據(jù)語境和邏輯來推斷出空所需要的詞性，或者是根據(jù)句子結(jié)構(gòu)的需要來推斷詞性，然后根據(jù)所給的漢語提示寫出正確答案．

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