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

試題分析:考查名詞辨析:A. reform      改革,B. approach方式,方法,C. boundary邊界,D. breakthrough突破,句意:這兩個中國科學(xué)家做出重大發(fā)現(xiàn),這標(biāo)志著這個領(lǐng)域的重大突破。選D。
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