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【題目】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】考查單詞意思辨析。A項“非法進入，闖入”；B項“突破”；C項“破裂”；D項“失敗，損壞”。根據句意“在過 去的幾年里，科學家在癌癥的治療上已經取得了重大突破”。所以答案是B。

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