1.pervasive a．普遍的，流行的(spreading throughout every part of)

词根记忆：来自pervade(v.遍及)

例：The ideology of eighteenth-century America was pervasive among farmers in early America.

2.perversion n.曲解，颠倒(the action of perverting)

词根记忆：per(始终)+vers(转)+ion--始终转过去--颠倒

例：This movie is a perversion of the author's book.

同根词：reverse(v.颠倒，倒退)

3.pesticide n.杀虫剂(an agent used to destroy pests)

词根记忆：pest(害虫)+i+cide(杀)--杀害虫的东西--杀虫剂

例：chemical pesticide化学杀虫剂

4.petition n.请愿（entreaty）；请愿书(a formal written request)

词根记忆：pet(寻求)+ition--寻求（帮助）--请愿

例：Do you want to sign a petition for statewide smoking restriction?

5.petroleum n．石油(mineral oil occurring in many places in the upper strata of the earth which is prepared for use as gasoline naphtha, or other products by various refining processes)

词根记忆：petro(石)+leum--石油

例：The petroleum company has recently determined that it could cut its refining costs.

6.pharmaceutical a．制药的(of the manufacture and sale of medicines)

词根记忆：来自pharmacy(n．药房；药剂学)

例：No industries other than the pharmaceutical industry have asked for an extension of the 20-year limit on patent protection.

同根词：pharmaceutics(n.制药学)