题目内容

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

分析 科学家在癌症治疗方面取得了重大突破．

解答 答案：breakthrough 
考查名词．根据所给的汉语提示"突破"和空前的形容词major可知，此处应用名词形式，结合前面的冠词a，所以应用名词单数形式，"突破"的英语是breakthrough，故填breakthrough．

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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