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【题目】Over years,scientists have made a great________in the treatment of cancer.

A. breakin B. breakthrough

C. breakup D. breakdown

【答案】B

【解析】考查单词意思辨析。A非法进入,闯入”;B突破”;C破裂”;D失败,损坏。根据句意在过 去的几年里,科学家在癌症的治疗上已经取得了重大突破。故答案为B。

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