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16.This is a purely _______ problem, not a political one. A. additional B. assiduous C. adamant D. academic academic adj.学术的、理论的 additional 额外的、附加的 additive 添加剂 addendum 补充、附录 add(增加)end(结束：尾巴)um adder 蝰蛇 deaf as an adder 充耳不闻 insidious 阴险的、狡诈的 in(往里)sid(坐)ious(形容词缀) preside 主持 consider 考虑 adamant 固执的 adam(亚当)ant(蚂蚁) | 
