题目内容
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 |
D
解析试题分析：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。
考点：考查名词辨析
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