2600.reward(名)报酬
Desert and reward seldom keep company.
赏罚不明乃司空见惯之事。

2601.rice(名)稻米、米饭
不可数
The rice has burnt.
饭烧焦了。

2602.rich(形)有钱的；丰富的
同义词pursy
My neighbor is rich businessman．
我的邻居是个很有钱的商人。

2603.riches(名)财富、财产
惯用复数
She gave away all her riches．
她放弃了所有的财产。

2604.ride(动)骑乘；(名)骑
不规作变化rode，ridden
(动):They rode in the back seat of the bus.
他们坐在公共汽车后面的座位上。
(名):I will give you a ride to school.我将载你去学校。

2605.rider(名)骑士
The horse bucked the rider off.
马跃起将骑士摔于马下。

2606.right(形)对的、正确的(名)杈利；正确
反义词wrong
(形):John was right in his answer.
约翰答对了。
(名):we have right to be free.
我们有自由的权利。

2607.ring(动)围住；回响(名)戒指、圈
不规则变化rang，rung
(动):My father's last words are still ringing in my ears.
我父亲的临终遗言还在我耳边回响。
(名)Is that your ring?
那是你的戒指吗？

2608.river(名)河流
The longest river in Africa is the Nile．
非洲最长的河流是尼罗河。

2609.roach(名)蟑螂
同义词cockroach
The girl was much frightened by a roach.
这女孩被一只蟑螂吓到了。

2610.road(名)道路
This is a road to success．
这是一条成功之路。

2611.robber(名)强盗
The robber broke open his house．
强盗砸开了他家的大门闯了进去。

2612.robberly(名)抢劫案
The news of the robbery of the bank was quickly bandied about.
银行遭到抢劫的消息很快传开了。

2613.robot(名)机器人
The current study is about space robot.
目前正在进行的研究工作是航空机器人。

2614.rock(名)岩石
Mountains are made of rock．
山是由岩石构成的。

2615.rocket(名)火箭
The planned to send a rocket to the moon.
他们计划向月球发射火箭。

2616.role(名)角色；任务
Robert denied any role in the robbery.
罗伯特否认曾经参与过这起抢劫案。

2617.roll(动)滚；摇晃
He rolled himself from side to side.
他左右摇晃。

2618.Roman(形)罗马的
R需大写
Roman culture was enduringly fertilized.
罗马文化不断地得到充实。

2619.room (名)房间、室
Come and see me in my room this evening.
今天晚上请到我家来看我。

2620.root(名)根；根源；祖先
These plants have very deep roots.
这些植物的根长得很深。

2621.rose(名)玫瑰
They engrafted a new rose onto a wild rose.
他们把一枝新品种玫瑰嫁接在野生玫瑰上。

2622.round(形)圆形的；大约的(名)一轮：回圈；巡回
(形):It'll cost somewhere round $50.
这大概要花50美元左右。
(名):The doctor is on his round of visits．
医生在巡回出诊。

2623.route(名)路线
We drove home by a round about route.
我们开车绕道回家。

2624.royal(形)皇家的、王室的
The royal family consists of the king and queen and their relations.
皇室是由国王、王后以及他们的亲属组成。

2625.royalty(名)王权：皇室成员
A crown worn as a sign of royalty.
王冠做为王权的象征。

2526.rubber(名)橡胶
This cable has a rubber casing.
这根电缆线外包有一层橡胶。

2627.rule(名)规则
He does everything by rules.
他事事墨守成规。

2628.ruler(名)统治者
The new nation needs modern-minded ruler．
这个新兴的国家需要具有现代思想的统治者。

2629.ruling(形)统治的
At this point,the ruling classes were willing to compromise.
在这个时候，统治阶层愿意妥协了。

2630.run(动)跑；行驶；继续
不规则变化ran，run
Are you running in the 100 meters?
你参加百米赛跑吗？

2631.runner(名)奔跑者、奔跑的人
The runner collapsed because of exhaustion.
那个奔跑者因为极度疲劳倒下了。

2632.sad(形)悲伤的、难过的
She's sad bacause her son is ill．
她因儿子生病而难过。

2633.safe(形)安全的；可靠的
反义词dengerous
A safe stateman is better than a clever one.
一个可靠的政治家比一个聪明的政治家更好。