职教组卷基于海量职教高考试题库建立的在线组卷及学习系统
职教组卷
  • 题型:英语知识运用 题类:其他 难易度:中档

    As we all know, ____________ cloning is the creation of cells or the whole animals using DNA from ____________ single “parent”.

    A. the; a B. a; a C. /; a D. /; the 
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