448.kid(名)小孩(动)开玩笑
(名):I just have a kid and life is a nightmare.我只有一个小孩，生活便如同噩梦。
(动):I was only kidding.我不过是在开玩笑。

449.kill(动)杀死、使……死亡；消磨时间
He killed ten good years on that job.他在那件工作上浪费了整整十年的时间。

450.kilogram(名)公斤
简称kg.
The largest brain possessed by any dinosaurweighed about a kilogram.最大的恐龙大脑约有一公斤重。

451.kind(形)仁慈的、慈爱的(名)种类
(形):They are very kind to me. 他们对我很好。
(名):There are all kinds of animals in the zoo.动物园里有各种各样的动物。

452.king(名)国王
He is a steel king.他是钢铁大王。

453.kiss(动)(名)亲吻
(动)：They kissed and said goodbye.他们亲吻道别。
(名):She gave her husband a kiss.她吻了她的丈夫一下。

454.kitchen(名)厨房
We usually eat in the kitchen.我们通常在厨房里吃饭。

455.kite(名)风筝；鸢
She had never learned to fly a kite.她一直没有学会放风筝。

456.knee(名)膝盖
She was on her knees weeding the garden.她跪在花园里除杂草。

457.knife(名)刀
复数knives
Put your knife and fork down on the plate if you've finished eating.如果你吃完了就把刀叉放在盘子上。

458.knock(动)击、打
The falling bottle knocked him on the head.跌落的瓶子砸在他的头上。

459.know(动)知道、晓得
不规则变化knew, known
There is one or two things I'd like to know about.有一两件事我很想知道。

460.knowledge(名)理解；知识
不可数
My knowledge of Mr. Brown is not very great.我对布朗先生了解不深。

461.lake(名)湖
He has a villa by the lake.他在湖畔有一座别墅。

462.lamp(名)灯
On the street, lamps are fixed to lamp posts.在街上，灯是固定在街灯柱上的。

463.land(名)陆地(动)登陆、降落
(名):Most mammals live on land.大多数哺乳动物生活在陆地上。
(动):The pilot landed the helicopter in a rice field.飞行员将直升飞机降落在一片稻田里。

464.language(名)语言
Language is an instrument for communication.语言是沟通的工具。

465.large(形)大的、巨大的
I want a large box, this is too small.我要一个大盒子，这个太小了。

466.last(形)最后的(动)维持、持续
(形);He was the last person to leave.他是最后离去的人。
(动):How long will the meeting last?会议要开多久。

467.late(形)晚的、迟的
He was late for school.他上学迟到了。

468.later(形)随后的、稍后的(副)较晚地；后来
(形):We will discuss this in detail in a later chapter.我们将在以后的章节中对这一点作详细地探讨。
(副):I went to bed later than usual.我比往常更晚睡觉。

469.laugh(动)笑、发笑
The jokes made everyone laugh.那些笑话使每个人都笑了起来。

470.lazy(形)懒惰的；无精打采的
His teacher thought he was lazy.他的老师认为他很懒惰。

471.lead(名)(动)领导、带领
不规则变化led, led
(名):All the children followed his lead.所有的孩子都以他为榜样。
(动):She led me into the living room.她带我进入客厅。

472.leader(名)领导者、领袖
He is a decisive leader.他是一个有决断力的领袖。

473.learn(动)学习、学会
My brother is learning English now.我的弟弟正在学英语。

474.least(形)最小的；最少的
He has least money in all of us.我们之中他的钱最少。

475.leave(动)离开
不规则变化left, left
Mr. Smith left the room at two o'clock.史密斯先生两点离开房间。

476.left(形)左边的
反义词right
Some people write with their left hands.有些人用左手写字。

477.leg(名)腿
I have a severe pain in my leg.我腿部剧烈疼痛。

478.lemon(名)柠檬；淡黄色
She drank a glass of lemon.她喝了一杯柠檬汁。

479.lend(动)借出
不规则变化lent, lent
Could you lend me your dictionary?你能把字典借给我吗？

480.less(形)少量的、较少的
He has less strength than I.他力气比我小。