【题目】Over years，scientists have made a great________in the treatment of cancer.
A. breakin B. breakthrough
C. breakup D. breakdown
在线课程【答案】B
【解析】考查单词意思辨析。A项“非法进入，闯入”；B项“突破”；C项“破裂”；D项“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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