6. Although some consider forcefulness and ___ to be two traits desirable to the same degree, I think that making a violent effort is much less useful than maintaining a steady one.
(A) persistence
(B) perseverance
(C) promptness
(D) aggression
(E) skillfulness
(F) lucidity
选AB
翻译：尽管有人觉得立竿见影和持之以恒(百折不挠、锲而不舍)同样值得追求，但我认为一通猛攻远不如不懈努力。
forcefulness 强力(比如有说服力)，有效
trait (性格等)特征，遗传特点，(笔等的)痕迹，少许、些微
violent 猛烈的，极端的，狂暴凶猛的，歪曲的
perseverance 坚持，百折不挠
promptness 及时的，迅速的，准时的
aggression 侵略挑衅，敌对情绪，攻击行为
lucidity 表述清晰、易懂，头脑清醒
