1.claim n.声称(assertion)；v.声称(to assert)；认领(to take as the rightful owner)：索取(to ask for especially as a right)

词根记忆：本身为词根：叫喊

例:Many of the economists claim that the government's plan has been successful.,,She persuaded Charles VII of France to claim his throne.

2.clan n.部落;氏族( group of families descended from a common ancestor)

词根记忆：和tribe(n．部落；类)一起记

例:matrilineal dans母系氏族

3.clandestine a.秘密的,暗中从事的(secret)

联想记忆：clan(部落)+destine(命中注定)“部落”和“命定”都有一些“秘密”色彩-秘密的，暗中从事的

例:The demand for the clandestine product would be substantially reduced.

4.clarity v.澄清(to make clear, to free of confusion)

词根记忆：clar(清楚)+ify(使…)--澄清

例:The explanation clarrfied the details of the plan.

5.clarity n.清楚，明晰(the quality or state of being clear)

例:Many writers of modern English have acquired careless habits that damage the clarity of their prose.

6.classify v.分类(to arrange in classes);归类(to assign to a category)

词根记忆：class(种类)+ify(伎…)--分类

例:The pterosaurs(翼龙)should be classrhbd as birds, not reptiles.

派生词:classification(n.分类法)：classified(a.分类的)