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The two Chinese scientists have made a wonderful discovery, which marks a major _______ in the basic research in the field.
A.reformB.approachC.boundaryD.breakthrough
D

试题分析:考查名词辨析:A. reform      改革,B. approach方式,方法,C. boundary边界,D. breakthrough突破,句意:这两个中国科学家做出重大发现,这标志着这个领域的重大突破。选D。
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