C级核心词汇推荐：
comprise v. 包含，由……组成;  (comprise – include - contain– be composed of – consist of – be made up of包含，由……组成)
concentrate v. 集中，浓缩 concentrate one’s attention on/集中精力在某方面，专心于concentrate upon/集中在，专心于; (concentrate on – focus on使…集中于一点 )
concept n. 观念，概念(concept – notion概念；观念);
concern vt. 涉及，关系到 n. (利害)关系，关心，所关心的事情as far as...be concerned/关于，至于，就……而言be concerned about/关心;
conclude v. 结束，终止, 作出结论vt. 推断，断定;
condition n. 条件，情形，环境 on condition that/如果..; be in good condition/完好无误;
conduct n.行为, 操行v.引导, 管理, 传导;
conference n. 会议a press [news] conference/记者招待会;
confident adj. 自信的，确信的;
confirm vt. 确定，批准;
conflict n. 斗争，冲突vi. 抵触，冲突in conflict with.../同……相冲突[有抵触，有矛盾]; 
confront vt. 使面临，对抗(be confronted with – be face up with - face面临，面对;
confuse vt. 搞乱，使糊涂;
confusion n. 混乱，紊乱 (confusion – chaos混乱)
congress n. (代表)大会，[C～] (美国等国的)国会，议会the National People’s Congress/[中]全国人民代表大会;
connect v. 连接，联合，关连 connect with/和……有联系，和……有关;
connection n. 联系
conquer vt. 战胜，占领，克服(困难等)，破(坏习惯等); (conquer – overcome克服)
conscious adj. 有意识的，有知觉的(be conscious of – be aware of 意识到)
consequence n. 结果(consequence – result结果), (in consequence – as a result因此) ;
consider vt. 考虑，认为(consider.. as.. – think of ..as..— take..as .../把……看作..); 
considerable adj. 相当大(或多)的，相当可观的;
consist vi. 由……组成，在于，一致 consist of包括，由……组成;
constant n. [数、物] 常数，恒量 adj. 不变的，持续的 (constant – continuous持续的);
construct vt. 建造，构造，创立; (construct – build up建造)
consume vt. 消耗，消费; (consume - use up - expend消耗)
consumer n. 消费者(consumer – customer消费者); 
contact n. 接触，联系vt. 接触，联系contact sb/和……联系be in/out of contact with.../和……接触，有联系[脱离接触，失去联系]; 
contain vt. 包含，容纳(contain – include –cover包含)