1.contradiction n.矛盾(a statement or phrase whose parts contradict each other);反駁(act or an instance of contradicting)

詞根記憶：來自contradict(v.反駁；否認)

例:It indicates why a contradiction described in the previous paragraph has been overlooked by historians.

2.contrast n.對比;差別(the difference or degree of difference between things having similar or comparable natures)v.對比;使與對照(to compare or appraise in respect to diferences)

例:In contrast, in the year prior to the tax increase, sales had fallen one percent.

派生詞：contrastive(a．對比的)

3.contribute v.貢獻(to play a significant part in bringing about an end or result)；投稿(to submit articles to a publication);捐獻(to give or supply in common with others)

詞根記憶：con(全部)+tribute(給予)--全部給予--捐獻

例:Automobiles become less fuel efficient and therefore contribute more to air pollution as they age.

派生詞：contribution(n.貢獻;捐獻;投稿)

同根詞：attribute(v.歸屬；把…歸于)

4.contributor n.貢獻者，捐助者(one that contributes a sum of money)；投稿者(a writer who submits his articles to a publication)

詞根記憶：來自contribute(v.捐獻)

例:Sulfur dioxide,a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants.

派生詞：contributory(a．捐獻的;貢獻的)

同根詞：tribute(n．贈品)

5.control v.控制，管理(to rule);n.（實驗的）對照，參照物(an individual or group used as a standard of comparison in a control experiment)

詞根記憶：control作為“參照物”的意思時是專業(yè)術(shù)語

例:It served as a controlfor the experiment.

6.controversial a．引起或可能引起爭論的(causing controversy)

詞根記憶：contro(相反)+vers(轉(zhuǎn))+ial--反著轉(zhuǎn)--引起爭論的

例:The relationship between corpulence and disease remains controversial

派生詞：controversially(ad.頗有爭議地)

同根詞：controvert(v.爭論；辯論)

7.controversy n.爭論，辯論(dispute)

詞根記憶：contro(相反)+vers(轉(zhuǎn))+y--意見相反一爭論，辯論

例:There are some possible approaches to resolving this long-standing controversy.

派生詞：controversial(a．爭議的，爭論的)

8.convection n．對流(the circulatory motion that occurs in a fluid at a nonuniform temperature owing to the variation of its density and the action of gravity)

Theoretically, this convection would carry the continental plates（板塊）along as though they were on a conveyor belt. ．

9.convenience n.便利(fitness or suitability for perfoming an action or fulfilling a require-ment)

聯(lián)想記憶：con（共同）+ven（來）+i+ence--共同行動來維護便民設施一便利

例:People buying pancake syrup at convenience stores,unlike those buying it at supermarkets,generally buy it only a few times.

同根詞：convene（v.召集）

10.Conventiona a.醫(yī)印看守舊的(according w．th a mode of artistic representation that simplifies or provides symbols or substitutes for natur a forms)；傳統(tǒng)的(0f traditional design)

詞根記憶：來自convention（n.習俗，慣例）

例:Conventional wisdom has it that Iarge deficits in the United States budget Cause interest rates to rise.

派生詞：conventionally（ad按照慣例地）

同根詞：convene（v.召集）