1.coaster n．杯垫(a small mat that is put underneath a glass or cup to protect the surface of a table)：（供娱乐用的）滑坡铁路

词根记忆：来自coast(n.海岸)

例:roller coaster过山车

2.cocaine n.可卡因(drug used as a local anaesthetic by doctors, and as a stimulant by drug addicts)

词根记忆：coca(古柯)+ine--可卡因

例:Thus enforcement efforts have ironically resulted in an observed increase in the illegal use of cocaine.

3.code n.法规(a body of law)；准则(a system of principles or rules)

例:the Education c6de教育法//code of ethics道德准则

4.codify v.整理（法律）（to classify）；系统化(to systematize)

词根记忆：来白code(n.法规)

例:Jim Crow laws did not go as far in codifying traditional practice as they might have.

5.cognitive a．认知的(of, characterized by, involving, or relating to cognition)

词根记忆：cogn(知道)+itive--知道的--认知的

派生词:cognitive ability认知能力

6.coherent a．连贯的(consistent)；清楚的（having clarity or intelligibility）；附着的，黏在一起的(sticking together)

词根记忆：co（-起）+her（黏着，黏附）+ent--附着的

例:The bacteria indeed form a large coherent group.

派生词:cohesive(a．黏着的)；coherence(n.一致)

7.coinage n.货币，货币制度(system of coins in use)

词根记忆：coin（币）+age(行为，结果)--货币

例:Debasement of the coinage had compensated for the loss.

8.coincide v.巧合(to concur)；-致，符合(to correspond)

词根记忆：co(共同)+in+cide(切)一共同切分--一致，符合

例:The discovery of leavened bread(膨松面包)roughly coincided with the introduction of a wheat variety.

派生词:coincidence(n.巧合之事)；coincident(a．巧合的)：coincidental(a.一致的)

9.collaborate v.协作(to work together)；勾结，通敌(to cooperate treasonably as with an enemy occupation force in one's county)

词根记忆：col(一起)+labor(工作)+ate--起工作--协作

例:The prisoners collaborated to plan the escape.

派生词:collaboration(n.合作；勾结)

10.collapse v./n.崩溃(to break down completely)；失败(to fail completely)

词根记忆：col( -起)+lapse(滑，落)--全部滑落--崩溃

例:The local sugar beet(糖用甜菜)industry collapsed in 1902.

同根词：elapse(让时间流逝)；lapse( v./n．失误)：relapse(v.旧病复发)