1.raffle n.抽奖（lottery）
联想记忆：raff(大量，一大堆)+le--在一大堆里抽--抽奖

例：raffle tickets抽彩券

2.ragtime n．拉格泰姆音乐（一种早期黑人爵士乐）(rhythm characterized by strong syncopation in the melody with a regularly accented accompaniment in stride-piano style)；a．滑稽的(funny)
联想记忆：rag(破衣服)+time(时候)--黑人穿破衣服的时候跳的爵士舞

例：Scott was a preeminent ragtime composer.

3.raid n./v.劫掠(foray);突袭（a surprise attack）
例：The king began to raid and conquer the enemy territory.

派生词：raider(n.袭击者)

4.railroad n.铁路（a permanent road having a line of rails)
词根记忆：rail(铁轨)+road(路)--铁路

例：The government should lower the railroad companies' property taxes.

5.rally n．（行情、价格等）跌后复升，反弹(rebound)

例：Economists predicted that there would be a rally in stocks and bonds.

6.ranch n．大农场(large farm, esp. in U.S. or Canada, where cattle are bred)

派生词：rancher(n．农场主)

7.rangeland n．牧场(land used or suitable for range)

联想记忆：range(漫游)+land(土地)--牛羊可以漫游的土地--牧场

8.ransom n．赎金(a consideration paid or demanded for the release of someone or something from captivity);v.救赎(to deliver from sin or its penalty)
联想记忆：ran(跑)+som（看作sum一笔钱）--用一笔钱跑--赎金
注意：random(a．随意的)

例：The hijackers demanded a ransom of a million pounds.//The prisoners should be ransomed.

9.ratification n．正式批准(formal confirmation)
词根记忆：来自ratify(v．正式批准)
例：The role 'of Congress in the ratification of treaties with sovereign nations was eventually undermined.