1、.重点单词识记联想运用会书写一、核心单词1.escape v.逃跑 2.feed v. 喂养;为提供食品 3.hang v. 绞死;吊死 4.drag v. 拖;拉;硬拽 5.eager adj. 热切的;渴望的 6.lock v. 用锁锁(起来)7.reward n. 酬谢;奖赏;赏金 8.seize v. 抓住 9.scream v. 尖叫;高声喊叫 二、阅读单词1.attain v. 获得,达到2.corporation n. 公司,企业 3.distribute v. 分发,分配,分送4.appetite n. 胃口;食欲5.pedestrian n. 行人6.repay v. 报答;
2、回报7.swallow v. 吞下;咽下(食物或饮料)8.welfare n. 幸福,福祉;健康9.whisper v. 低声地说;耳语10.illegally adv. 违法地;非法地11.mourn v. 悼念,哀悼,为哀痛12.nutrition n. 营养(作用);滋养三、拓展单词1.intend v.打算intention n.打算,目的,意图2.desperate adj.绝望的desperation n.绝望desperately adv.绝望地,拼命地,不顾一切地;非常地3.healthy adj.健康的health n.健康unhealthy adj.不健康的 4.scene
3、 n.场面;场景 scenery n.风景,景色(总称)5.accomplish v.完成(任务等),取得(成功)accomplishment n.成就;完成6.cruel adj.冷酷的cruelty n.残酷;冷酷 7.serve v.端上(饭菜等)service n.服务;服侍 8.starvation n.挨饿,饿死starve v.(使)挨饿,(使)饿死9.concern n.关心(的事),担心v.影响到;涉及concerned adj.关心的,担心的;有关的concerning prep.关于10.accumulate v.积累accumulation n.积累,积聚会积累1.“奖
4、赏,奖金”名词小聚reward奖金,奖品award 奖品,奖励prize 奖品,奖赏bonus 奖金,红利scholarship 奖学金2.“说”之动词集锦whisper 低声地说murmur 低声说address 讲话repeat 重复retell 复述3.ate结尾动词一览accumulate 积累;积聚accelerate (使)加快advocate 提倡,主张allocate 分配 appreciate 欣赏;感激 concentrate 集中4.serve相关词汇串记serve v. 招待,供应;为服务;端上(饭菜等)service n. 服务;服侍 deserve v. (不用于进
5、行时态)应得, 应受 observe v. 观察, 监视, 观测 preserve v. 保护, 保留, 保存reserve n.& v. 储备;预定 会应用用所给词的适当形式填空1.She becomes more and more desperate in the days of desperation,_but she still saves the situation desperately.(desperate)2.With the intention of becoming famous and rich, many ordinary people intend to take p
6、art in some TV shows, such as The Voice of China.(intend)3.The old man was starved to death.People felt pity for his starvation.(starve)4.Everyone in the world is eager for happiness.That is to say, all people on the earth eagerly hope for happiness.(eager)5.Our parents are concerned about our healt
7、h and future.As far as Im concerned,_we should talk with our parents and tell them our concerns.(concern)6.The manager promises that when we accomplish this task, he will hold a party to celebrate our accomplishment.(accomplish)7.She accumulated a large fortune after years of hard work, and the accu
8、mulation process was full of bitterness.(accumulate).核心短语识记联想运用会书写1.be_cruel_to对冷酷 2.pick_out 挑选,挑出 3.suffer_from 遭受 4.escape_from 从逃离 5.a_huge/large_amount_of 大量的 6.stare_at 凝视,盯着看 7.in astonishment 惊讶地,吃惊地8.in a.voice 用声音_(说)_9.let go of 放开,放弃10.bring sth to the attention of sb 使某人关注某事11.put up 张贴
9、,搭建,建造会积累1.“动词out”短语荟萃give out分发,发放 work out 得出(结果、总数等)go out 出去,熄灭 find out 查明;弄清 look out 当心 sell out 售完 think out 仔细考虑 hold out 递出;拿出;伸出;坚持;维持;坚守,守住lay out 布置,设计;铺开,展开2.“in抽象名词”短语集锦in astonishment 惊讶地in silence 默默地in surprise 惊讶地in peace 和平地in secret 秘密地会应用选用上表左栏短语填空1.I need a_large_amount_of mon
10、ey to buy that expensive apartment.2.When her family received the news, everyone kept a short silence in_astonishment.3.My daughter stared_at me angrily, as if I were her wicked stepmother.4.He was picked_out from our school to take part in the English competition to be held in the city.5.Along with
11、 the advance of society more and more problems are_brought_to_theattention_of the public.6.The discovery of the new drug is of great significance to people who suffer_from heart disease.经典句式分析背诵仿写句型公式1:not until.位于句首时,句子用部分倒装。教材原句 Not until at least thirty seconds had passed, was the man able to spe
12、ak.至少过了三十秒钟,这个人才能说出话来。句型仿写 Not until 2016 did the increase of the boxoffice income of Chinese movies slow_down.(2017江苏卷满分作文)直到2016年中国电影票房收入的增长才放慢速度。句型公式2:only修饰状语放在句首时,句子用部分倒装。 Only then did Oliver understand his situation.只有在那时奥利弗才明白自己的处境。Only by understanding and learning from each other can_we_sp
13、end these days together happily.(天津卷书面表达) 只有通过相互理解和学习,我们才能一起开心地度过这些美好的日子。句型公式3:no sooner.than.“一就”。教材原句 No sooner had the boy spoken these words than the warden hit him on the head with the soup spoon.孩子的话刚出口,大师傅就操起汤勺狠狠地敲打他的脑袋。句型仿写 No_sooner_had_we_seen_the_videos_than the memories of the past came
14、flooding back, which further strengthen a firm bond to our school.(2017北京卷满分作文)我们一看到这些视频,回忆潮水般地涌回,这更加强了与我们学校的坚固纽带。.语篇填空回顾补全热诵根据课文内容,在空白处填入1个适当的单词或括号内单词的正确形式。Oliver Twist and his panions(company) in the workhouse slowly starved for three months and they became quite wild with hunger because each boy
15、2.was_served (serve) only one bowl of soup and no more.Among them,there was a boy 3.whose father had kept a cook shop.One day,he said if he did not have another bowl of soup each day,he might eat the small young boy who slept next to him.So the boys decided 4.to_choose (choose) one to ask the warden
16、 for more food.Oliver Twist was picked out.5.Desperate (desperately) with hunger and misery,Oliver Twist walked towards the master to ask for more food.The warden stared at the child in complete 6.astonishment (astonish).No sooner had the boy spoken these words 7.than the warden hit him on 8.the hea
17、d.Then he seized Olivers arms and shouted for Mr Bumble.The next morning a notice was put up on the door of the workhouse,9.offering(offer) a reward to anybody who 10.would_employ (employ) Oliver Twist.核 心 词 汇1.serve v.为服务;为服役;供应;侍候(顾客等);端上(饭菜等);(给某人)提供;满足一词多义写出下列句中serve的含义Mrs.Smith served the guest
18、s tea and cakes in the garden.提供He served more than 20 years in the army.服役The new hospital serves the needs of the local community.满足Frank has served this company his whole working life.为服务(1)serve the people heart and soul全心全意为人民服务serve as充当;担任serve sb (with) sthserve sth to sb拿/用某物招待/款待某人(2)servi
19、ce n.服务at your service愿为您效劳;听候您的吩咐From this experience I have learnt that questioning can serve as a bridge that helps us to seek the truth.从这次经历中我得知,质疑可以当作帮助我们寻求真理的一座桥梁。Serving (serve) as the manager of the company provided me with a lot of chances to get to know many talented people.担任公司经理为我提供了许多结
20、识有才干的人的机会。The hotel promised to provide good service (serve) to every customer.这家旅店承诺向每位顾客提供优质的服务。2.intend v.想要,意欲,打算(1)intend doing/to do sth打算做某事 intend sb to do sth 打算让某人做某事 intend that.(should) do sth 打算;主张had intended to do/thatintended to have done 本来打算做(事实上没做成)be intended for. 为打算(或设计)的(2)int
21、ention n. 意图,目的,打算 have no intention of doing sth 不打算做某事I intend to_join/joining (join) a Dragon Boat Training Camp.I wonder if youd like to go with me.我打算参加龙舟训练营,我想知道你是否愿意和我一起参加。We had_intended (intend) to arrive at our destination at 9 oclock, but we didnt because of the traffic jam.我们本来打算在9点钟到达目的
22、地,但是由于交通堵塞我们晚点了。My mother bought a book for me with the intention of learning French, which is intended for beginners.我妈妈为了让我学法语给我买了一本书,这本书是为初学者设计的。3.reward n.酬谢;奖赏;赏金 v.酬谢;奖励(1)as a reward for.作为对的回报in reward for. 为了酬谢或报答give/offer a reward to sb for sth give/offer sb a reward for sth为某事而给某人报酬/回报(2
23、)reward sb for (doing) sth为(做)某事报答/奖赏某人reward sb with. 用报答/回报某人(3)rewarding adj. 值得做的;有益的The next morning a notice was put up on the door of the workhouse, offering_a_reward_to anybody who would employ Oliver Twist.(教材原句)第二天早上在济贫院的门上贴出了一张通知:给任何一个雇用奥利弗的人提供一份奖赏。In addition, the team set up a separate
24、experiment that suggested that the baby birds that most closely imitated their moms voice were_rewarded_with the most food.(2017江苏卷)除此之外,这个团队还做了一个单独的实验,实验表明那些模仿其妈妈的声音最接近的雏鸟被奖赏最多的食物。When asked for his views about his teaching job, Philip said he found it very interesting and rewarding (reward).当被问到他对
25、他的教书工作的看法时,菲利普说他觉得它非常有趣和有意义。 辨析比较reward, award名词动词reward报酬,奖金或一些非金钱类的报酬多指因对方的工作、服务、帮助而给予的报答或奖赏、奖金award奖品,奖金,与prize用法相似指正式地或官方地颁发、授予、给予;往往鼓励杰出的表现或对所提出的要求而进行的一种奖励。常用搭配:award sb sth award sth to sb选用以上单词填空After being awarded the first prize, he expressed that he would continue to reward the people and
26、the society with his hard work.4.eager adj.热切的,渴望的(1)be eager to do sth渴望做某事,热心做某事be eager for sth 渴望得到某物be eager in sth 热衷于某事be eager that. 热切地希望(2)eagerness n. 热心,渴望I couldnt hide my eagerness (eager) to get back home.我无法掩饰想回家的渴望。The little girl works very hard and she is_eager_for her parents app
27、roval.这个小女孩学习非常努力,她渴望得到父母的赞许。Now that Helen understood the key to language, she was very eager to_learn (learn) more and use it as much as she could.既然海伦理解了语言之谜,她非常渴望学习更多并且尽可能多地使用它。5.hang v.绞死;吊死;悬挂hang up挂断(电话)hang out/about/around 闲荡;闲逛hang onhold on(打电话时)别挂断;坚持,不放弃;等一下,停一下;抓紧 hang on to 抓紧;保留,不卖掉
28、,不放弃Sorry, I have to hang_up now.Its time for class.OK, Ill call back later.对不起,现在我要挂电话了,到了上课的时间了。好的,过一会我再打过去。The line was engaged and the operator asked if Id like to hang_on.电话占线,话务员问我是否愿意稍等一下。The principal warned the students not to hang_out/about around the corner drugstore after school.校长警告学生放学
29、后不要在街角的杂货铺里闲逛。名师指津词义不同的hang有其不同的变化形式:意义过去式过去分词现在分词绞死,吊死hangedhangedhanging悬挂,垂下hungHunghanging用hang的适当形式填空He hanged himself two hours after arriving at a mental hospital last month.There is a curtain hanging before his window in the bedroom.“Dont expect any present this year,” Dad said, pointing at
30、the socks I hung in the living room.6.whisper v.低声地说;耳语 n.低语,耳语;传闻(1)whisper sth to sb对某人耳语某事It is whispered that.传闻说,有人私下里说(2)in a whisper/in whispers ( in a low voice)小声地The boys whispered_to_each_other,_and those next to Oliver nudged him.(教材原句)男孩们彼此低声说着话,靠近奥利弗的那些男孩把他推开。It was_whispered (whisper)
31、 that he would soon die and he did.有人私下说他将不久于人世,他果然死了。In order not to let the others hear what he said, he told me the news in a whisper.为了不让别人听见他说的话,他小声告诉我那个消息。7.a huge/large amount of大量的(1)a huge/large amount of修饰不可数名词(2)“a huge/large amount of不可数名词”作主语时,谓语动词用单数(3)“huge/large amounts of不可数名词”作主语时,
32、谓语动词用复数Lots of students in our class spend a_large_amount_of time doing homework, but show little interest in physical exercise and afterclass activities.我们班很多同学花费大量时间来做家庭作业,但对体育锻炼和课外活动却不感兴趣。A good amount of sleep every night is (be) also important for your health.每晚保证大量的睡眠对你的健康也很重要。Large amounts of
33、 water are_needed (need) for cooling purpose.冷却要用大量的水。名师指津常见数量修饰语分类:修饰可数名词复数:many, a good/great many, a good/large number of 修饰不可数名词:much, a good/great deal of, a large amount of, large amounts of 既可修饰可数名词复数又可修饰不可数名词:a lot of, lots of, a quantity of, quantities of, plenty of重 点 句 型No_sooner had the
34、boy spoken these words than the warden hit him on the head with the soup spoon.孩子的话刚出口,大师傅就操起汤勺狠狠地敲打他的脑袋。句中no sooner.than.表示“一就”,引导时间状语从句,主句通常用过去完成时,从句通常用一般过去时。no sooner 位于句首时,主句要部分倒装,而than引导的从句不倒装。有类似用法的还有hardly.when.。常见的表示“一就”的句式还有:(1)as soon as.(2)the moment/minute/instant/second.(3)immediately/i
35、nstantly/directly.(4)on/uponn./v.ing.(5)at the sight/thought/mention/sound of.一看到/一想到/一提到/一听到就Hardly had the football game begun when it started raining.足球比赛才刚刚开始就下起雨来。Instantly/Immediately Eason Chan appeared on the stage of Sing! China, the audience cheered up.The moment/instant/minute_Eason Chan
36、appeared on the stage of Sing! China, the audience cheered up.陈奕迅一出现在中国新歌声的舞台上,观众们就欢呼起来。当 堂 达 标.单词拼写1.A reward (奖赏) will be paid to anyone who brings back the money Mr.Brown lost, according to the advertisement.2.The monkey suddenly emerged from behind the tree, frightening Lucy into screaming (尖叫).
37、3.Word came that the government hanged (绞死) the hero.Local residents reacted angrily to it.4.I often have a hard time dragging (拉;硬拽) myself from my bed or even rolling over to write everything I have dreamt in my notebook.5.Platpus is a strange animal that lays eggs but feeds (喂养) milk to its young
38、.6.He must have gone out.I heard the noise of the door being locked (锁) when I was still in bed.7.Students are eager (渴望的) for new knowledge to suit themselves to the future jobs in various fields with which they are unfamiliar.8.Helen Keller ever wrote in her article that only through experiences o
39、f trial (尝试,努力) and suffering can success be achieved.单句语法填空1.The woman got nothing in reward for her kindness, which made her very upset.2.Its a custom in China to have some tea or other drinks before the meal is_served (serve).3.Whoever breaks the school rules will surely receive punishment (punis
40、h).4.The picture hanging (hang) on the wall is painted by my nephew.5.I had hardly got to the office when my wife phoned (phone) me to go back home at once.6.He touched me with his finger, whispering (whisper) to me in my ear, “The teacher is coming.”7.I dont want to work under stress and I am eager
41、 for a job that isnt stressful.8.In some places there are many laws against cruelty (cruel) to animals.单句改错1.When international aid is given, steps must be taken to ensure that the aid reaches the people to whom it is intended.第二个tofor_2.Although we are beaten, we must hang up.upon3.Before the boys
42、dead body was buried, the soldiers stood at silence.atin_4.A huge amount of money have been spent on the new bridge.havehas5.No sooner had she got out of her car when two men in black pushed her into the car with a gun pointing at her.whenthan.一句多译/句型转换1.学生们用一些苹果来招待邀请来的专家。The students served some ap
43、ples to_the_invited_experts.The students served the invited experts with_some_apples.2.我送给他一本书来答谢他的帮助。I gave him a book as_a_reward_for his help.In_reward_for his help,I gave him a book.I rewarded_him_with a book for his help.3.电影院太黑了,我认不出我的朋友。It was so dark in the cinema that_I_could_hardly_pick_ou
44、t_my_friend.It was so dark in the cinema that_I_could_hardly_make_my_friend_out.It was so dark in the cinema that_I_could_hardly_recognise_my_friend.4.I had no sooner walked into the room than the phone rang.I had_hardly_walked into the room when the phone rang.Hardly/No_sooner_had_I_walked into the
45、 room when/than the phone rang.5.The child was whispering to his mother in the corner.The child was telling his mother something in a whisper in the corner.课 下 作 业题型组合练.语法填空(2018河南省高三毕业班第一次模拟考试)It was my first time visiting the United States.Before 1._ (leave) for Washington D.C.,I downloaded some i
46、ntroductions about some tourist 2._ (attract) in the city.Therefore I knew something about this city before the trip.A lot of things happened during my trip to Washington D.C.However,3._ impressed me most is the International Spy Museum,which I visited on the 4._ (three) day of the trip.In my spare
47、time, I often watched movies about spies with my parents because I was 5._ (extreme) interested in spies.I acquired 6._ good knowledge of that after I read the descriptions in the museum.I learned that spies usually hid important letters in an umbrella, in a shoe, or even in a pair of ordinary 7._(g
48、lass).When they thought they were probably found out, they could have their appearances 8._ (change) in a few minutes.They put on fake hair, eyes or teeth.If they had an emergency,they even changed a smaller pair of shoes to change their walking styles in order not to 9._ (recognize).10._ conclusion
49、, it was a nice trip.I had a good time in Washington D.C.I will remember this trip forever.【语篇导读】本文是一篇记叙文。文章主要介绍了作者去美国的一次旅游经历。1.leaving考查非谓语动词。leave与其逻辑主语I之间是主动关系,故此处应用leave的现在分词形式。故用leaving。2.attractions考查名词的复数。attraction是可数名词,根据其前的“some”可知,此处应用其复数形式。tourist attractions意为“旅游景点”。故用attractions。3.what
50、考查名词性从句。分析句型结构可知,“_ impressed me most”是主语从句;空格处在从句中作主语,表示“的东西”。故用what。4.third考查序数词。此处表示“第三天”,定冠词the与序数词连用,表示“第几”。故用third。5.extremely考查副词。此处应用副词extremely修饰形容词interested,意为“非常感兴趣”。故用extremely。6.a考查冠词。acquire a knowledge of.为固定短语,意为“学会、获得的知识”。故用a。7.glasses考查名词的复数。根据空格前的“a pair of”可知,此处指“一副眼镜”,表示复数概念。故用
51、glasses。8.changed考查非谓语动词。此处构成have sth done的结构,意为“使某物被”。此处指“使他们的外貌被改变”。故用changed。9.be recognized考查被动语态。根据句型结构分析可知,动词recognize与句子主语they之间是被动关系,意为“他们甚至换了一双小一些的鞋子,改变了走路的样子,就是为了不被认出来”;to后用动词原形。故用be recognized。10.In考查介词。in conclusion意为“总之”,符合语境。注意首字母大写。故用In。.短文改错(2018湖南省衡阳市高中毕业班联考)Good morning, everyone!W
52、hat Id like to share it with you today is my source of strength.My grandmother died of the incurable illness last year, and I still miss her terribly.I will never see her again, never share a laugh with her and buy her a new scarf.The older I get,the more I realize that love, unconditional love, is
53、rarely.When you lose a grandparent, you lose one of the few persons who love you.So much has happened from my grandmothers death.Time keeps rushed forward.Sometimes I wish I can make it stop.In the chaos of these changing times, my grandmother gave me numerous sweet memory that I can hold on to.I ma
54、y not always know Im going, but I will always know where I came.To me, that was a source of great strength.答案Good morning, everyone!What Id like to share with you today is my source of strength.My grandmother died of incurable illness last year, and I still miss her terribly.I will never see her aga
55、in, never share a laugh with her buy her a new scarf.The older I get,the more I realize that love, unconditional love, is .When you lose a grandparent, you lose one of the few persons who love you.So much has happened my grandmothers death.Time keeps forward.Sometimes I wish I make it stop.In the ch
56、aos of these changing times, my grandmother gave me numerous sweet that I can hold on to.I may not always know Im going, but I will always know where I came.To me, that a source of great strength.书面表达 (2018齐鲁名校教研协作体山东、湖北部分重点中学高考冲刺模拟)假设你是李华,你班将于本周六去龙湾度假村(Longwan Resort)春游。请你根据以下信息给外教Adam写封信,邀请他参加。1.出
57、发及返回时间;2.活动:骑车、钓鱼、划船、烧烤。注意:1.词数100左右;2.可适当加入细节,以使内容充实、行文连贯;3.信的开头和结尾已给出,不计入总词数。Dear Adam,Yours,Li Hua【参考范文】Dear_Adam,Im one of your students,Li Hua.Our class is planning to go for an outing this Saturday,so I am writing on behalf of our classmates to invite you to join us.Since spring is coming with
58、 all the trees turning green and blossoming,we all think it is a good opportunity for us to get close to nature and relax ourselves.Weve scheduled to gather at the school gate at 9:00 a.m.,and take a bus to Longwan Resort,which will take about half an hour.The varieties of activities will definitely
59、 appeal to us.Well have a lot of fun:riding bicycles,fishing,rowing boats in the take and even barbecuing.About 3 hours later,well be back to school.Im sure you will like this program.We sincerely hope you can come and enjoy a good time with us.Yours,Li_Hua基础回扣练(回扣B7M1B7M3).单词拼写 1.Its difficult for
60、him to support(养活) himself on such a small salary.2.George seized (抓住) the good chance to present his proposal to the director, and at last, it was adopted.3.The picture hanging (悬挂) in my study was painted by a famous artist.4.She started singing to the baby and was rewarded (酬谢) with a smile.5.The
61、 moment I saw him, his name simply escaped (被遗忘) me, and I stood there not knowing how to address him.6.Education should adapt to the childrens needs and abilities(能力).单句语法填空1.As a reward for being admitted to college, many students got iPhone 8 as presents.2.The total sales of the company didnt amo
62、unt to more than a million dollars.3.My daughter is considering buying (buy) a digital camera,which is considered to be a great help to her work.4.As you mentioned that you are particularly keen on traditional magical novels with superb fantasy, I do recommend Journey to the West to you.5.I must set
63、tle down to finishing (finish) writing the book.It is very urgent.6.She was upset to_know (know) that her application for the position was refused.选词填空 stare at, in astonishment, look back at, have fun, if necessary1.The authors purpose of writing the text is to look_back_at his childhood with adven
64、tures.2.Children should be taught not to stare_at handicapped people because it is impolite.3.I have_fun playing games because it gives me time to be with friends, learn new things, and work as a team.4.I looked at him in_astonishmentI didnt expect to see him again here.5.While speaking to foreigner
65、s, you must try to make yourself understood by using body language if_necessary.根据提示词或结构补全句子1.直到莉莉走进办公室时,她才意识到她把合同落在家里了。(only置于句首)Only when Lily walked into the office did_she_realize that she had left the contract at home.2.学好英语不容易,但是如果你能坚持下去,你最终会成功的。(hang)It is not easy to learn English well, but
66、if you hang_on,_you will succeed in time.3.我们正在操场上踢足球,这时突然下雨了。(when) We were_playing_football on the playground when it began to rain.4.你绝对可以信赖他的话,因为他总是说老实话。(rely on/upon) You may rely_on/upon his words absolutely,for he always speaks the truth.单元语法专练一、单句语法填空1.Hardly had we arrived in Jiangxi Provin
67、ce the next morning when we found many places flooded by the thunderstorm.2.Dont try to threaten (threat) me.I wont compromise with you.3.It was with his ironfist approach to fighting corruption in the southern state that the 70yearold man built a political name.4.She was a bright and eager student
68、and, consequently (consequent), did well in school.5.What the author of the book intends to express is not the loneliness of being trapped on a deserted island but the faith in overcoming any problem ahead.6.Some members of the committee expressed reservations (reserve) about the proposal.7.Shutting
69、 doors, finishing chapters or whatever; what matters is not what we call it but to leave in the past those moments in life that are over.8.The limits of a persons intelligence, generally speaking, are fixed at birth, but whether he reaches these limits will depend on his environment.二、单句改错1.No soone
70、r had I got on the train when it started to move.whenthan2.What the doctors really doubt is that his mother will recover from the serious disease soon.thatwhether_3.What really flatters a man is how you think him worth flattering.howthat_4.Whether bothers me is that the young man seems to know a bit too much.WhetherWhat_5.Whoever has helped to protect the environment are worth praising.areis