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
网友回答
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。