Probably one of the most revolutionary innovations in science during this century was the recognition of the duality of matter;【

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问题     Probably one of the most revolutionary innovations in science during this century was the recognition of the duality of matter;【51】, in some aspects of its behavior matter is【52】described as a particle, and in【53】aspects as a wave. This revolution in scientific thought took place almost three-quarters of a century ago. By now most scientists have come to accept it【54】, happily for science, there are still some who are convinced that they can uncover a deeper【55】of truth in which the coexisting systems of thought will be replaced by a unified view.
    Those who resist this revolution【56】science are not regarded as a threat. They are not branded as counterrevolutionary. There is a good reason for【57】Stated simply, it is that if change marks a step forward on, say, 1 July 1997, then change can【58】represent progress at some future date.
    The concept of "one matter, two descriptions" introduced in the 1920s represented a【59】advance. But it constitutes no more than a step along the path toward greater【60】. The door remains open to further discoveries.   (185 Words)

选项 A、that is
B、it is
C、it was
D、which is

答案A

解析 A表示举例关系。
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