【題目】In the past few decades, scientists have made a great ________ in the treatment of cancer.

A. breakout B. breakdown C. breakup D. breakthrough

【答案】D

【解析】

考查動(dòng)詞短語辨析。

句意：過去幾十年里，科學(xué)家在癌癥的治療方面取得了巨大的突破。A. 發(fā)生 B. 故障；崩潰 C. 解體,分手，放假 D. 突破。故選D。

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