问题补充：
The two Chinese scientists have made a wonderful discovery, which marks a major in the basic research in the field.
A. reform
B. approach
C. boundary
D. breakthrough
答案：
A. reform
B. approach
C. boundary
(答案→)D. breakthrough
解析：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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