1. [词海垂钓]从词典中“钓”出一串同根词吧。
ob-（=towards）
2. [由此及彼]根据已知单词的词义推断出其同根词的词义。
① consecutive a.连贯的→inconsecutive a.
② consequent a.符合逻辑的→inconsequent a.
③ consequential a.重大的→inconsequential a.
3. [同义相连]将左栏中的单词和右栏中相对应的词义连接起来。
① consequence a.结果；后果
② subsequence b.随后（发生的事）
③ execution c.执行；处死刑
④ persecution d.起诉；告发
⑤ prosecution e.虐待；迫害
4. [寻根问底]指出下列单词的词根并领会其词义的由来。
① executioner n.死刑执行人，刽子手
② sequela n.后患，后遗症
③ sequacious a.顺从的，盲从的；合乎逻辑的
④ self-consequence n.妄自尊大
⑤ obsequious a.奉承的；顺从的
5. [节外生枝] sequ还有一个异形根sue，以下是主要的派生词。
① sue v.控告，起诉；请求
② ensue v.接着发生；接着而来；结果是
③ pursue v.追赶；追捕；追随；追求
pursuance n.追赶；追求；实行；从事
pursuant a.追赶的；追求的
84. sid, sess [L]=to sit坐
在常用词president，reside，session和possess中，有一对同源异形根sid和sess。sid来自拉丁动词sidere的不定式词干，sess来自动名词词干，其意思相当于to sit（坐）或to settle（安放）。
preside [pre-=before前；sid=to sit坐；-e→“to sit before others坐在其他人前面”→] v. sit in authority;act as chairman主持；作会议主席：to preside at a meeting 主持会议
▽presider [presid(e);-er n.] n.（会议的）主席；主持者
presidium [presid(e);-ium n.] n.主席团；常务委员会
president [presid(e) v.主持，当权；-ent n.=person人→] n. person chosen to preside over a nation, university or any other organization总统；大学校长；会长；社长等
▽presidency [pre-;sid;-ency n.] n.总统等的职位或任期
presidential [president;-ial a.] a.总统（或校长等）的
reside [re-=back, down回，下；sid=to sit or settle坐，安放；-e→“to sit backward, to settle down靠背安坐，安顿下来”→] v. make one's home at a place安家，居住：to reside in the city在城市居住
▽resident [resid(e);-ent n.] n.居民
residence [resid(e);-ence n.] n.居住；住宅
subside [sub-=under, down下；sid=to sit or settle坐，停留；-e→“to settle down停在下面，停息”→] v.① sink down下沉；沉降：The building subsides gradually.这座房子逐渐下沉。② fall into a state of quiet平息：The wind has subsided.风停了。
▽subsidence [subsid(e);-ence n.] n.下降；沉降；平息
dissident [dis-=apart分开；sid=to sit坐；-ent n.=person人→“person who sits apart from others 与别人分开坐的人”→] n. person openly disagreeing with an opinion; dissenter 持异议者；反对者：political dissidents持不同政见者
▽dissidence [dis-;sid;-ence n.] n.异议；不一致
assiduous [as-(ad-)=to, at面向；sid=to sit坐；-u-;-ous a.=having the quality有……性质的→“having the ability to sit at a place to work能面壁而坐坚持工作的”→] a. constant or unwearied in application;diligent刻苦的；勤奋的：He is assiduous in his study.他学习勤奋。
▽assiduity [as-;sid;-u-;-ity n.] n.刻苦；勤奋
insidious [in-=in内；sid =to sit坐；-i-;-ous a.=like像……的→“like sitting in a hidden place, like setting an ambush像坐在暗处的，像打埋伏的”→] a.① intended to entrap伺机为害的：insidious diseases暗疾② deceptive;treacherous暗中为害的；阴险的：an insidious tempter阴险的诱惑者
▽insidiousness [insidious;-ness n.] n.阴险；狡诈
session [sess=to sit坐；-ion n.=the act or state表行为或状态→] n.① act of sitting坐；就座② sitting, or time of sitting, as of a court or public body开会；开庭；会期；开庭期：plenary session全体会议
▽sessional [session;-al a.] a.开会的；开庭的
possess [pos（来自potis）=able能……的；sess=to sit坐→“to be able to sit in a place能坐在一个位置上”→] v.① inhabit, or occupy居住于；占据②have or hold as property;own具有；占有：He possessed landed property.他拥有地产。③ maintain, or control保持；控制：She was possessed by the desire to be rich.她被发财的欲望所支配。
▽possessor [possess;-or n.] n.占有人；所有人
possession [possess;-ion n.] n.占有；占有物；财产；领地
possessive [possess;-ive a.] a.占有的 n. [语法]所有格
assess [as-(ad-)=to, at在；sess=to sit坐→“（judges in a court）to sit at or sit by（法官等在法庭）就座”→“to judge or estimate作判断，估计”→] v.① fix the value or profits of对……进行估价：His property is assessed at one million dollars.他的财产估价为100万元。② decide the amount of (a tax )征收（税款）：to assess a tax of ten pounds征税10镑
▽assessment [assess;-ment n.] n.估价；评价
assessor [assess;-or n.] n.估价财产的人；确定税款的人
assessable [assess;-able a.] a.可估价的；可征税的
