Over years, scientists have made a great _____in the treatment of cancer.
A．break-inB．breakthroughC．breakupD．breakdown
B
詞義辨析。     A. 闖入  B.突破   C. 解體  D. 故障；崩潰。句意：過去幾年中我們?cè)诎┌Y的治療方面取得了巨大的突破。故選B。
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