https://online2.tingclass.net/lesson/shi0529/0001/1240/12-3.mp3
https://image.tingclass.net/statics/js/2012
16.This is a purely _______ problem, not a political one.
A. additional B. assiduous C. adamant D. academic
<academic>
academic adj.學(xué)術(shù)的、理論的
</academic>
<additional>
additional 額外的、附加的
additive 添加劑
addendum 補充、附錄
adder 蝰蛇
deaf as an adder 充耳不聞
</additional>
<assiduous>
assiduous 勤奮的、好學(xué)的
insidious 陰險的、狡詐的
preside (over) 主持
consider 考慮
</assiduous>
<adamant>
adamant 固執(zhí)的
</adamant>
