江苏省某外国语学校高二英语作业4 1 UNIT3 THE WORLD ONLINE(牛津译林版选修7).doc
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
8 0人已下载
| 下载 | 加入VIP,免费下载 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 江苏省某外国语学校高二英语作业4 UNIT3 THE WORLD ONLINE牛津译林版选修7 江苏省 外国语学校 英语 作业 ONLINE 牛津 译林版 选修
- 资源描述:
-
1、一、单词拼写根据单词的首字母或汉语意思填写正确单词,注意形式变化。1. Everything has n _effects and also p_ effects.2. If you want to know about c_ affairs, you can read newspapers or surf the Internet. 3. I am fond of skiing while he is a_ to skating.4. I believe friendship should be based on c_ interests.5. We shouldnt judge a per
2、son by a_.6. We cannot always tell if the information is true or f_.7. The accident o_ on a cold night.8. When you come across new words in the text, its better to guess their meaning before c_ the dictionary.9. Her books enjoy a high p_ among teenagers in many countries.10 Dont i_ me in your family
3、 problems.11 Before making up your mind, you have to take everything into _(考虑).12 The weather _ (预报)said there would be sunny.13 She has _ (获得、习得)a knowledge of English by careful study.14 Buses run _(频繁 ) between the city and the airport.15 The public remain _(怀疑 ) of these claims.16 The figures a
4、re not _(准确 ).17 I lost touch with all my friends and I felt d_ from the world around me.18 When I come to a new place, itll take me a long time to get a_ to it.19 One of the greatest _ (优势 ) is that they can save people lots of time and energy.20 I dont think the price is _(合理 ), so I wont take it.
5、二、选词填空in need of, be addicted to, deal with, have an effect on, keep in touch with, get accustomed to, make out, make sense, make of, turn to1. You look sleepy. You are _ sleep.2. Can you tell me how to_ these old books?3. I_ my parents by telephoning them regularly.4. She has grown up and I cant _
6、her _.5._e for help if you have any difficulty.6. Theyve_ going to bed early and getting up early.7. Raising sheep and cows on hilly areas really_.8. This table is_ solid dark wood.9. The medicine _ instant _me. I am fine now.10. Those who _ drugs are suffering greatly.三、完成句子1. How much do you know
7、about international _ _ (时事)?2. Do you know how to _ _answers_ questions (搜索问题的答案) on Internet?3. With no one to _ _(求助), she felt hopeless and homesick.4. He prefers to _ _ (上网) _ _ (而不是) go shopping with his wife.5. Have you _ _ _ (把.考虑进去) all the possible delays on the way before leaving for his
8、office?6. I become _ _ _ (习惯于写) my most private thoughts in my diary.7. You may come to my home whenever you want to, only letting me know _ _ (提前).8. Whenever we run into new words, we may _ (查询) the dictionary.四、单项选择 1. Letter boxes are much more _ in the UK than in the US, where most people have
9、a mailbox instead. A. commonB. normalC. ordinaryD. instead2. It was already past midnight and only three young men _ in the teahouse. A. leftB. remainedC. delayedD. deserted3. Be quick! There are only ten minutes _. A. to remainB. remainedC. leftD. to leave4. Although he has taken a lot of medicine,
10、 his health _ poor. A. provesB. remainsC. maintainsD. continues5. It remains _ whether he is suitable for the position. A. seenB. to be seenC. seeingD. to see6. Please tell me how the accident _. I am still in the dark. A. was occurredB. was happenedC. came uponD. came about7. It suddenly _ to me th
11、at they went there by bike. A. occurredB. happenedC. took placeD. looked8. The boy has _ a fine knowledge of geography by careful study. A. requiredB. inquiredC. acquiredD. addressed9. She never seems at ease _ Ain my presence Bwith my presence Cwith presence of mine Dat my presence10. She _ worldwi
12、de recognition due to her unusual talent. A. gainedB. wereC. getD. was11. We must _ ourselves to the problem of traffic pollution. A. deal with B. work outC. solveD. address12. When I was young, I was always _ to my elder brother wherever he went. A. attachedB. attackedC. attendedD. surrounded13. We
13、 should _ importance to job training. A. concentrateB. devoteC. attachD. emphasize14. Fitness is important in sports, but of at least _ importance are skills/ A. fairB. reasonableC. equalD. proper15. He quickly became _ to TV soap operas. A. accustomingB. ashamedC. addictedD. accomplished五、翻译句子1. 这座
14、桥应该建在交通最繁忙的地方。2. 无论你在世界的任何地方都可以与家人保持联系。3. 尽管他只有有限的技术知识,但这个老工人有很多经验。4. 有多少比例的人上网查新闻?5. 比起乒乓球人们更喜欢什么运动?6. 这一段和十月革命有关系。7. 在昏暗的大街上,他找不到可以求助的人。8. 你习惯与住在乡下吗?9. 因特网对我们的生活方式有积极的影响。10. 在参加某项减肥项目前,你得考虑健康。六、任务型阅读形式1)The Internet has 1 effect on our livesIts 2 for people to look for information7 information1._3
15、_ for answers to questions 2.to advance_4_ about hobbiesAffecting peoples_10_livesTo build social _6_ 9 informationThe _8_ in the way people spend their timeThe ability to build groups online and form 5The Internet has positive effects on our livesTitle: the effects of the Internet on our lives2)Zhu
16、 Zhenfei and Lin Lei had a _about the pros and _of internet use. Zhu Zhenfei first analyzed the value for people who are looking for information. He also mentioned the ability to build groups online and form _.People can use it to build _ties. Internet friendships can be built based on common_. With
17、 the help of the Internet, the disabled can _with the outside world.But Lin lei lists the _ effects. He thinks the main _of the Internet are _ information and the _in the way people spend their time. He thinks that the _ of false information becomes more of a problem. Another disadvantage of the Int
18、ernet he refers to is that it is _ peoples private lives. 练习二Word power一、计算机用语英汉互译1. 硬件_ 2. 软件_ 3. 存储器,内存_ 4.打印机_5.Scanner_6. Paste_7. Virus_8. browse _ 9. minimize_ 10. 黑客_ 二、写出以下网络聊天用语全写并翻译成中文1. BTW _ 2. BBL _ 3. CU _ 4. FTF _ 5. IMO _ 6. OIC _ 7. TTUL_ 8. VG _ 9. OMG _ 10. B4_三、单项选择1. We have bec
19、ome to this house and would not like to move. A. attached B. responsible C. devoted D. applied2. If you keep on, youll succeed .A. in time B. at one timeC. at the same time D. on time3. As far as I concerned, education is about learning and the more you learn, .A. the more for life are you equippedB
20、. the more equipped for life you areC. the more life you are equipped forD. you are equipped the more for life4. On hearing the news of the accident in the coal mine, she _ pale. A. gotB. changedC. wentD. appeared5. , Id have told you.A. If I would have known itB. If I had have known it C. Had I kno
21、wn itD. Should I know it 6. fired, your health care and other benefits will not be immediately cut off.06.湖北卷A. Would you be B. Should you beC. Could you be D. Might you be7. If places alike, there would be little need for geographers.A. being B. are C. be D. were8. If you treat your coat so roughly
22、, it will soon.A. wear out B. wear it outC. be worn outD. worn out9. He was sentenced to be innocent in the court , ,the court set him free legally. A. therefore B. whats more C. thats to say D. in that case10. effects do you think the teachers behaviorhas the childrens growth? A. What ; in B. How;
23、inC. How; on D. What; on11(2007江西)Ouch! You hurt me! I am sorry. But I _ any harm. I _ to drive a rat out. A. didnt mean; tried B. dont mean; am trying C. havent meant; tried D. didnt mean; was trying12. I along the street looking for a place to park when the accident .A. went; was occurring B. went
24、 ; occurred C. was going; occurred D. was going; had occurred13. The dictionary is _for beginners of English. A. of great value B. of very valuableC. great value D. of very value14. She spent an afternoon her coins and stamps.A. sorting into B. sorting outC. to sort out D. to sort into15. He_have go
25、ne there yesterday.A. didnt need B. neednt C. dont need D. needing四、完形填空(04湖南)I grew up in a community called Estepona. I was 16 when one morning, Dad told me I could drive him into a 1._1_ village called Mijas, on condition that I took the car in to be _2_ at a nearby garage. I readily accepted. I
26、drove Dad into Mijas, and _3_ to pick him up at 4 pm, then dropped off the car at the _4_. With several hours to spare, I went to a theater. _5_, when the last movie finished, it was six. I was two hours late!I knew Dad would be angry if he _6_ Id been watching movies. So I decided not to tell him t
27、he truth. When I _7_ there I apologized for being late, and told him Id _8_ as quickly as I could, but that the car had needed a major repairs. Ill never forget the _9_ he gave me. “Im disappointed you _10_ you have to lie to me, Jason. ” Dad looked at me again. “When you didnt _11_, I called the ga
28、rage to ask if there were any _12_, and they told me you hadnt yet picked up the car. ” I felt _13_ as I weakly told him the real reason. A _14_ passed through Dad as he listened attentively. “Im angry with _15_. I realize Ive failed as a father. Im going to walk home now and think seriously about _
29、16_ Ive gone wrong all these years. ” “But Dad, its 18 miles!” My protests and apologies were _17_. Dad walked home that day. I drove behind him, _18_ him all the way, but he walked silently. Seeing Dad in so much _19_and emotional pain was my most painful experience. However, it was _20_ the most s
30、uccessful lesson. I have never lied since. 1. A. lonely B. small C. distant D. familiar2. A. kept B. washed C. watched D. serviced3. A. agreed B. planned C. determined D. promised4. A. villageB. community C. garage D. theater5. A. However B. Then C. Therefore D. Still6. A. realized B. found out C. t
31、hought D. figured out7. A. went B. ran C. walked D. hurried8. A. started B. left C. arrived D. come9. A. word B. face C. look D. appearance10. A. find B. decide C. believe D. feel11. A. turn up B. drive out C. go away D. come out12. A. questions B. problems C. mistakes D. faults13. A. ashamed B. fri
32、ghtened C. nervous D. surprised14. A. nervousness B. sadness C. silence D. thought15. A. you B. myself C. me D. yourself16. A. where B. how C. why D. when17. A. meaningless B. useless C. helpless D. worthless18. A. asking B. persuading C. begging D. following19. A. physical B. practical C. personal
33、D. natural20. A. indeed B. always C. also D. almost五、根据文章内容,用方框中所给词的正确形式填空distant change convenient increase log develop safe communicate spend beneficial The Influence of InternetWith the rapid _1_ of Internet, it has been influencing our daily life tremendously. Internet has transformed our lives
34、and the way we_2_, how we learn, how we work and _3_ free time. In fact, it has more or less _4_ every aspect of human society.We can benefit a lot from Internet. Firstly, it is more _5_ than ever before. Internet has greatly shortened the _6_ among human beings. Secondly, we can reduce our cost gre
35、atly. Although Internet has brought us many benefits, there can be no denying that it has brought us many inconveniences, even harms as well. First of all, it is not _7_ on Internet. Maybe thousands of people are staring at you when you _8_ onto Internet. On the other hand, with the sharply _9_ amou
36、nt of time spent on Internet, we are starting to lose ourselves, especially for those youngsters. However, Internet itself is neither right nor wrong. We can _10_ from it and may also suffer from it. Nobody can hold back the step forward of Internet. If we resisted it, we would certainly lag behind
37、other nations. What we should do is to take full use of its advantages and try to avoid the harms it may bring as well.练习三Grammar usage一、用联系动词的适当形式填空: 1. Wood _ hard. 2. The exercise _ easy, but in fact its very hard. 3. Dont you think the music of the song _ beautiful? 4. Most leaves begin to _ yel
38、low in autumn. 5. The fish _good; the children like it very much. 6. The girls face _ red when she heard his words. 7. Its true that parents _ old when children grow up.二、用所给词的正确形式填空: 1.Why dont you put the meat in the fridge? It will_(stay)fresh for several days.2.Lucy, hurry up. Im afraid you wont
39、 have time to get _(change)before the party.3.The gentleman whom you told me yesterday_(prove) to be a thief.4.Having a trip abroad is certainly good for the old couple, but it remains_ (see)whether they will enjoy it.5.The flowers _ (smell)sweet in the botanic garden attracted the visitors to the b
40、eauty of nature.三、单项选择1. The traffic lights _ green and I pulled away. (2006广东) A. came B. grew C. got D. went2. One of the best ways for people to keep fit is to_ healthy eating habits. (2006湖北) A. grow B. develop C. increase D. raise3. - I was wondering if we could go skiing on the weekend. - _goo
41、d. (2006湖北) A. Sound B. Sounded C. Sounding D. Sounds4. Someone who lacks staying power and perseverance is unlikely to _ a good researcher. (2006山东) A. make B. turn C. get D. grow5. In the dark forests _, some large enough to hold several English towns. (2005辽宁) A. stand many lakesB. lie many lakes
42、 C. many lakes lie D. many lakes stand6. Books of this kind well.A. sell B. sells C. are sold D. is sold7. Three fifths of the cattle sold abroad in the city. A. has B. has been C. have D. have been8. Three-quarters of the land covered with green grass while the rest _ covered with pine trees. A. is
43、;is B. is;are C. are;is D. are;are9. Do let your mother know all the truth. She appears _ everything. (上海 2001 ) A. to tell B. to be told C. to be telling D. to have been told 10. He is one of the students who _ winners of scholarship for three years.A. isB. areC. have beenD. has been11. I don t wan
44、t _ like I m speaking ill of anybody, but the manager s plan is unfair.(2005天津高考题) A. to sound B. to be sounded C. sounding D. to have sounded12. The cloth that _ smooth and soft _. A. feels; sells well B. feels; is well sold C. is felt; sells well D. is felt; sells good13. _ delicious, the food was
45、 soon sold out. A. Tasted B. Being tasted C. Tasting D. To taste14. Happy birthday, Alice! So you have _ twenty-one already. A. become B. turned C. grown D. passed15. The pilot asked all the passengers on board to remain _ as the plane was making a landing. A. seat B. seating C. seated D. to be seat
46、ing16. Be careful when you cross this very busy street. If not, you may _ run over by a car. A. have B. get C. become D. turn17. _ nice, the flower is popular all over the world.ATo smell B. Smelling CSmelled D. Smell18. I havent seen Mary these past few days. Im afraid she _ herself for some time.
47、A. isnt feeling B. hasnt been feeling C. hadnt been feeling D. wasnt feeling19. His parents wished him to be a doctor, but he _ a singer in the end.A. became B. gotC. grew D. turned20. We dont care if a pet dog smells _, but we really dont want him to smell _. A. well; well B. bad; bad C. well; badl
48、y D. badly; bad21. When they heard the bad news, they all looked _ at the master and felt quite_.A. sad; sad B. sadly; sadly C. sad; sadly D. sadly; sad22. I love to go to the seaside in summer. It _ good to lie in the sun or swim in the cool sea.A. does B. feels C. gets D. makes23.-How are you toda
49、y?-Oh, I_ as ill as I do now for a very long time.A. didnt feel B. wasnt feeling C. dont feel D. havent felt24. Our master teacher _ to be fifty; in fact he is just over thirty.Alooks B. appearsC. likes D. sounds25. As we joined the big crowd I got _ from my friends. ( NMET2001 ) A. separated B. spa
50、red C. lost D. missed 四、完形填空(07全国)In the United States there was an unusual tale telling of the daughter of a mechanic (技工). One day while walking along the bank of a lake, the girl 1 to see 20 eggs laid by a wild goose. After some time the girl 2 the mother would not return to her eggs and she 3 to
51、 take them home. There she carefully 4 the eggs in the heat of a lamp. Several days 5 the eggs broke and the baby geese came into the 6 .Geese are known to take the first living thing they see as their mother. 7 , to these young geese, the girl was their mother. As they 8 , the girl was able to 9 he
52、r birds to run across the grass, but she could not teach them to 10 . The girl became increasingly worried about this, both when 11 and in her dreams. Later, she had an 12 : She would pilot a plane to guide them in 13. She asked her father for a plane and he assembled(组装)a small aircraft for her. Ca
53、ring about 14 safety, the father decided to pilot the plane himself. However, the birds did not 15 or follow him, and 16 slept in the grass. One day, the girl17 into the plane, started it and soon left the 18 . Seeing their mother take to the air, the birds 19 flapped(拍打)their wings and 20 . She fle
54、w the plane freely in the sky, her young birds following. 1. A. managed B. attempted C. happened D. supposed 2. A. realized B. expected C. imagined D. admitted 3. A. helped B. decided C. afforded D. meant4. A. placed B. protected C. treated D. examined 5. A. ago B. out C. later D. long 6. A. family
55、B. lake C. home D. world 7. A. But B. Also C. Thus D. Still8. A. increased B. improved C. rose D. grew9. A. ask B. lead C. want D. allow10. A. fly B. race C. swim D. sing 11. A. asleep B. away C. around D. awake12. A. idea B. opinion C. explanation D. excuse 13. A. sky B. heaven C. flight D. plane14
56、. A. his B. her C. their D. its 15. A. respect B. remember C. recognize D. receive 16. A. so B. instead C. hardly D. too17. A. climbed B. looked C. reached D. fell18. A. house B. floor C. water D. ground19. A. secretly B. disappointedly C. patiently D. eagerly20. A. looked away B. set outC. went by
57、D. turned back五、任务型阅读请认真阅读下列短文,并根据所读内容在文章后表格中的空格Autumn blues? Let the sunshine in falling leaves, withering flowers, cold winds, faint sunshine. For many people late autumn can be a season of gloom and depression. Spirits can be low.people who suffer from the autumn blues often are extremely exhaust
58、ed, lack energy, need more sleep, feel increased appetite and gain weight.The exact cause of this condition, often called seasonal depression or seasonal affective disorder (SAD), is not known yet, says Chen Jue, associate professor at Shanghai Mental Health Center. But recent studies indicate that
59、weather change is influential and strongly suggest that this condition is caused by changes in the availability of sunlight.One theory is that with decreased exposure to sunlight, the biological clock that regulates mood, sleep, and hormones is delayed, running more slowly in winter. Exposure to lig
60、ht may reset the biological clock.Another theory is that brain chemicals that transmit information between nerves may be altered in individuals with SAD. It is believed that exposure to light can correct these imbalances.It is a sad season, but you can try to make it happy. Remember, spring always l
61、ives in your heart, Chen says. Here are some tips to deal with autumn depression.- Go outdoors and get some sunlight. Move around. Fresh air and exercise improve the respiratory(呼吸) system and blood circulation and regulate the nervous system. Thus, exercise is calming and relieves ones mood.- Relax
62、 at work. Stretch, breathe deeply. Take a tea break. Think of your next vacation.- Keep a chocolate bar in your pocket. Chocolate and sugar raise the spirits.- Look at bright colors, such as red and orange. Color therapy improves mood.- Listen to your favorite music. You can dance to it, or just lie
63、 on a cozy couch, reading a novel.- Decorate your room and work space with flowers. Blooming plants are cheering.- Call friends or family when you feel lonely or depressed. Recall some happy memories. Autumn BluesAutumn blues is also called autumn (1) .The real cause for it is still (2) to us. Expos
64、ure to sunlight can help to cure it.There are some (3) that can help to deal with it.The first reason is that exposure to sunshine can reset the biological clock (4)_ _mood, sleep and hormones.The second is (5)_ with the balance of nerves that transmit information.Outdoor (6)_May reduce the tension
65、that brings you the low spirits.You can relax yourselves while working. Food (7)_In calories and sugar does help too. (8)_Treatment also works in handling low mood. Music also (9)_a role in treating autumn blues.Green plants are cheering. Calling your friends will (10)_yourloneliness away.Thinking o
66、f the sweet past is regarded as a good way as well.练习四 Task & Project一、单词拼写:根据单词的首字母或汉语意思填写正确单词,注意形式变化。1. A blind man cant j_ colors.2. Her teeth are f_, but look very natural.3. Hes a t_ boy; no one likes to be with him.4. He related how the accident had o_.5. The garden is p_; only the owner can u
67、se it.6. He likes novels. Once getting in to one, he is a _ to it and forgets his meals.7. Mary looked at me to see how I would h_ the difficulty.8. Her books have grown in p_.9. He is a _ visitor to this country. (频繁的)10. I am _ about his chances of winning.(怀疑的)11. Your suggestion sounds r_, but w
68、ell have to talk about it.12. The audience a_ anything that pleased them in the concert.13. We are not to make any comments about you. How will you _ yourself? (评价)14. A lawyer is employed on l_ matters.15. She a_ a stamp to the envelope.二、词组互译1. another aspect of 13. 对有负面影响2. heavy Internet users 1
69、4. 急需3. the main drawbacks of 15. 听天气预报4. affect ones private lives 16. 与专家交流5. feel disconnected to the real world 17. 建立社会联系6. complete a diploma course 18. 影响某人的正常生活7. support ones arguments 19. 沉迷于网络8. be based on common interests 20. 记住,牢记9. be happy with the outcome 21. 急切地想做某事10. have no qual
70、ifications 22. 改正错误11. on that basis 23. 对.很肯定12. as a general rule 24. 被分成三、完型填空 (辽宁)Lang Lang is a world-class young pianist who grew up in ShenyangHe went to a piano school in Beijing when he was just eight“You need 1” his father said“But if you dont work hard, no fortune will come”What made him
71、said was 2 his piano teacher in Beijing didnt like him“You have no talent(天赋)You will never be a pianist” 3 a nine-year-old boy, Lang Lang was badly 4 He decided that he didnt want to be a 5 any moreFor the next two weeks, he didnt touch the piano 6 , his father didnt push, but waited Luckily, the d
72、ay came when his teacher asked him to 7 some holiday songsHe didnt want to, but as he placed his fingers on the piano keys, he 8 that he could show others that he had talent 9 That day he told his father 10 he had been waiting to hear-that he wanted to study with a new teacher11that point on, everyt
73、hing turned around!He started 12competitions(比赛)In the 1994 International Young Pianists Competition, when it was 13that Lang Lang had won, he was too 14to hold back his tearsSoon 15was clear that he couldnt stay in China forever-he had to play on the world big 16In 1997 Lang Lang 17again, this time
74、 to Philadelphia, USThere he spent two years practicing, and by 1999 he had worked hard enough for fortune to take overAfter his 18performance at Chicagos Ravinia Festival, gigs(特邀演出) in Lincolns Center and Carnegie Hall started 19, Lang Lang finally worked to reach the place where fortune spots(发现)
75、him, and lets him 201Aexercise Bfortune Cknowledge Dwealth 2Awhether Bwhy Cwhen Dthat 3ALike BWith CTo DAs 4Ahurt Bweakened Cruined Dfrightened5Asinger Bpianist Cconductor Dplayer 6AHopefully BPatiently CWisely DPainfully7Aplay Bsing Cwrite Dstudy8Aseemed Badmitted Cnoticed Drealized9Ain all Babove
76、all Cafter all Dat all 10Athat Bwhat Cwhich Dwhen 11AFrom BAs CSince DAfter12Areceiving Baccepting Cwinning Dbeating 13Atold Bmentioned Cannounced Drecognized14Aexcited Bencouraged Cshocked Dsatisfied15Athis Bit Cthat Dwhat16Aconcerts Btours Ccompetitions Dstages17Astarted Bleft Cmoved Dperformed18A
77、successful Bcheerful Crespectful Dmeaningful19Apulling Bbreaking Cfalling Dpouring20Abrighten Bshine Cadmire Ddevelop四、任务型阅读请认真阅读下列短文,并根据所读内容在文章后表格中的空格里填入最恰当的词。 Wen Jiabao arrived in Singapore yesterday for an official visit to the country. It is the first visit by a Chinese premier to Singapore in
78、eight years. In the arrival statement, When said he is looking forward to the meeting with Singing pore on ways to deepen East Asian cooperation between two nations so as to contribute to the building of a peaceful, harmonious relationship.Premier Wen Jiabao and Singapore Prime Minister Lee Hsien Lo
展开阅读全文
课堂库(九科星学科网)所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。
链接地址:https://www.ketangku.com/wenku/file-341093.html


鄂教版七年级语文下册第8课《诗两首》精题精练.doc
