高一必修一英語(yǔ)完形填空訓(xùn)練及詳解_第1頁(yè)
高一必修一英語(yǔ)完形填空訓(xùn)練及詳解_第2頁(yè)
高一必修一英語(yǔ)完形填空訓(xùn)練及詳解_第3頁(yè)
已閱讀5頁(yè),還剩38頁(yè)未讀, 繼續(xù)免費(fèi)閱讀

下載本文檔

版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請(qǐng)進(jìn)行舉報(bào)或認(rèn)領(lǐng)

文檔簡(jiǎn)介

1、.高一年級(jí)完形填空練習(xí)及詳解來源: 網(wǎng)絡(luò) 發(fā)布時(shí)間: 2009-09-05 編輯: 娟子 我來糾錯(cuò) 我來說兩句(0) 字號(hào):大 中 小Marriage is still a popular institution in the United States, but divorce(離婚) is becoming_1_as“popular”.Most American people get married, _2_,at the present time, and fifty percent of American marriages end _3_ divorce. However, four

2、 out of five divorced people do not _4_ single. They get married a second time to _5_ partners. Sociologists(社會(huì)學(xué)家)tell us that in the next century, _6_American people will marry three _7_ four times in one lifetime. Alvin Toffler, an American sociologist, _8_this new social form serial(連續(xù)的)marriages

3、. In his book Future Shock, Toffler gives many _9_ for this change in American marriage. In modern society, _10_ lives dont stay the same for very long.Americans_11_ change their jobs, their homes, and their circles of _12_So,the person who was a _13_ husband or wife ten years ago is sometimes not a

4、s good ten years _14_After some years of marriage, a husband and wife can _15 _that their lives have become very different, and they dont 16the same interests anymore. For this reason, Toffler says, people in the twenty first century will not _17_ to marry only one person for an _18_ lifetime. They

5、will plan to stay married to one person for perhaps five or ten years, and then marry _19_.Most Americans will expect to have a “marriage carrier”that _20_ three or four marriages.1. A. already B. almost C. ever D. even2. A. anyway B. then C. but D. therefore3. A. with B. from C. in D. for4. A. live

6、 B. take C. make D. stay5. A .new B. old C. young D. pretty6. A. most B. main C. few D. mostly7. A. and B. by C. or D. to8. A. asks B. calls C. tells D. lets9. A. causes B. chances C. problems D. reasons10. A. humans B. peoples C. persons D. mans11. A. frequently B. quickly C. rapidly D. fast12. A.

7、parents B. classmates C. neighbors D. friends13. A. polite B. strict C. good D. unfriendly14. A. late B. latter C. lately D. later15. A. imagine B. feel C. believe D. suppose16. A. enjoy B. hold C. divide D. share17. A. desire B. plan C. wish D. design18. A. entire B. extreme C. total D. whole19. A.

8、 the other B. others C. other D. another20. A. appears B. happens C. includes D. carries解析1almost“幾乎”,這里表示在美國(guó)結(jié)婚和離婚都很普通。答案為B。2.多數(shù)美國(guó)人結(jié)婚,但是,美國(guó)又有一半的人最終離婚。答案為C。3. end in divorce表示“以離婚結(jié)束”。答案為C。4. stay single表示“保持單身”,五分之四離婚的人都不愿意保持單身。答案為D。 5. get married to是一個(gè)固定搭配,表示“跟某人結(jié)婚”,這里指跟新的、另外的人結(jié)婚。答案為A。6. A表示“多數(shù)”。答案

9、為A。7. C表示“三到四次”,多數(shù)美國(guó)人一輩子結(jié)婚三到四次。答案為C。8call表“稱作,稱為”。答案為B。9. reasons表示“原因,說明的原因”。答案為D。10. peoples lives表示人們的生活,不會(huì)保持很長(zhǎng)。答案為B。11. frequently表示“經(jīng)常地,不斷地”,在這里指美國(guó)人不斷地改變自己的工作。答案為A。12. 他們的朋友圈子也在改變。答案為D。13. 人們的審美標(biāo)準(zhǔn)在不斷地發(fā)生變化。答案為C。14. 十年前的標(biāo)準(zhǔn)和十年后的標(biāo)準(zhǔn)有很大區(qū)別。答案為D。15. B表示“感覺到”,答案為B。16. share the same interests“有共同的興趣”。答案

10、為D。17. plan to do sth表示“計(jì)劃做”。答案為B。18. an entire life表示“整個(gè)一生”。答案為A。19. marry another表示“跟另外一個(gè)人結(jié)婚”。答案為D。20. includes表示“包括,包含”。答案為C。高一年級(jí)完形填空練習(xí)及詳解(一)來源: 網(wǎng)絡(luò) 發(fā)布時(shí)間: 2009-09-05 編輯: 娟子 我來糾錯(cuò) 我來說兩句(0) 字號(hào):大 中 小1. A. whichB. whenC. thatD. thisMrs. Jones was over eighty, but she still drove her old car like a woma

11、n half her age. She loved driving very fast, and was proud of the fact 1 she had never, in her thirty-five years of driving, been punished 2 a driving offence (犯規(guī),犯法).Then one day she nearly 3 her record. A police car 4 her, and the policemen in it saw her 5 a red light without stopping. Of course,

12、she was stopped. It seemed 6 that she would be punished.7 Mrs. Jones came up to the judge, he looked at her seriously and said that she was 8 old to drive a car, and that the 9 why she had not stopped at the red 10 was most probably that her eyes had become weak 11 old age, so that she had simply no

13、t seen it.When the judge had finished what he was 12, Mrs. Jones opened the big handbag she was 13 and took out her sewing. Without saying a word, she 14 a needle with a very small eye, and threaded it at her first attempt.When she had 15 done this, she took the thread out of the needle again and ha

14、nded 16 the needle and the thread to the judge, saying, “Now it is your 17. I suppose you drive a car, and that you are quite sure about your own eyesight.”The judge took the 18 and tried to thread it. After half a dozen tries, he had still not succeeded. The case (案例) against Mrs. Jones was 19, and

15、 her record 20 unbroken.2. A. aboutB. onC. toD. for3. A. keptB. wonC. missedD. lost4. A. watchedB. afterC. followed D. ran after5. A. passB. goC. runD. rush6. A. sureB. indeedC. certainD. perhaps7. A. BeforeB. WhileC. UntilD. When8. A. soB. veryC. tooD. quite9. A. causeB. reasonC. matterD. trouble10

16、. A. lightB. lampC. sign D. one11. A. withB. because C. forD. of12. A. speakingB. sayingC. talkingD. telling13. A. holdingB. gettingC. carryingD. bringing14. A. tookB. brought C. pickedD. chose15. A. almostB. hardlyC. successfullyD. successful16. A. bothB. allC. neitherD. either17. A. timeB. turnC.

17、chanceD. job18. A. threadB. glasses C. needlesD. needle19. A. dismissed B. passedC. settledD. studied20. A. wasB. kept C. seemedD. remained答案與解析:1-5 CDDCA 6-10 CDCBA 11-15 ABCDC 16-20 ABDAD1.C.fact后接that, 因?yàn)閠hat 引導(dǎo)的是一個(gè)同位語(yǔ)從句。2.D.for表示被懲罰的原因。3.D.她始終保持著記錄,但那天她差點(diǎn)兒丟了這個(gè)記錄,因?yàn)樗J了紅燈。4.C.警車跟在她后面,用followed,而wa

18、tched不妥,因?yàn)橹髡Z(yǔ)是警車,而不是人。ran after 也不對(duì),警車在此之前沒理由追趕她。5.A.pass a red light,而用go 則要說go by。6.C.用certain,不用sure,因?yàn)閟ure 常用人作主語(yǔ)。7.D.此處came為瞬間動(dòng)詞,不能用while。8.C.這是tooto結(jié)構(gòu),表示太而不9.B.reason是說明某事某現(xiàn)象的理由,而cause 則指火災(zāi)、水災(zāi)或事故的起因。10.A.紅燈,用red light。11.A.with此處相當(dāng)于because of。12.B.強(qiáng)調(diào)說話的內(nèi)容用say,指說話的動(dòng)作或講某種語(yǔ)言用speak。13.C.表示隨身攜帶,不強(qiáng)調(diào)方

19、向性,用carry,而bring則表示由遠(yuǎn)往近帶來。14.D.此處是挑了一根小眼的針,如用took, brought和pick都要加up或out。15.C.從下文看,老太太顯然是成功了。16.A.指針和線兩者,所以用both。17.B.your turn表示該輪到你了。18.D.為什么是針呢因?yàn)楹筮呌幸痪湔f她要thread it。19.A.be dismissed被取消了。20.D.remained表示過去是這樣,現(xiàn)在仍保持這一狀態(tài)。seemed,語(yǔ)氣不夠肯定。kept此處應(yīng)用was kept。高一年級(jí)完形填空練習(xí)及詳解(二)來源: 網(wǎng)絡(luò) 發(fā)布時(shí)間: 2009-09-05 編輯: 娟子 我來糾

20、錯(cuò) 我來說兩句(0) 字號(hào):大 中 小When Dave was eighteen, he bought a secondhand car for 200 so that he could travel to and from work more_1_ than by bus. It worked quite well for a few years, but then it got so old, and it was costing him _2_much in repairs that he decided that he had better _3_it.He asked among

21、his friends to see if anyone was particularly_ 4_ to buy a cheap car, but they all knew that it was falling to pieces, so_5_ of them had any desire to buy it. Daves friend Sam saw that he was _6_ when they met one evening, and said, “Whats _7_, Dave”Dave told him, and Sam answered, “Well, what about

22、 advertising it in the paper You may _8_more for it that way than the cost of the advertisement!” Thinking that Sams_9_was sensible(合理的),he put an advertisement in an evening paper, which read “For sale: small car, _10_ very little petrol, only two owners. Bargain at 50.”For two days after the adver

23、tisement first appeared, there was no _11_.But then on Saturday evening he had an enquiry(詢問).A man rang up and said he would like to_12_ him about the car. “All right,” Dave said, feeling happy. He asked the man whether ten oclock the next morning would be_13_or not. “Fine,” the man said, “and Ill

24、_14_my wife. We intend to go for a ride in it to _15_ it.”The next morning, at a quarter to ten, Dave parked the car in the square outside his front door, _16_ to wait there for the people who had_17_ his advertisement. Even Dave had to _18_that the car really looked like a wreck(殘骸).Then, soon afte

25、r he had got the car as clean_19_ it could be, a police car stopped just behind him and a policeman got out. He looked at Daves car and then said, “Have you reported this _20_ to us yet, sir”1. A. directly B. safely C. properly D. easily2. A. so B. such C. very D. too3. A. keep B. repair C. sell D.

26、throw4. A. anxious B. lucky C. ashamed D. generous5. A. some B. neither C. none D. most6. A. delighted B. upset C. calm D. astonished7. A. on B. up C. it D. that8. A. learn B. miss C. get D. find9. A. message B. advice C. request D. description10. A. uses B. loses C. has D. spends11. A. doubt B. hel

27、p C. trouble D. answer12. A. tell B. see C. agree D. call13. A. exact B. suitable C. early D. late14. A. follow B. meet C. bring D. introduce15. A. recognize B. gain C. admire D. test16. A. happening B. meaning C. turning D. failing17. A. read B. inserted C. answered D. placed18. A. forget B. show C

28、. disagree D. admit19. A. as B. that C. so D. such20. A. bargain B. sale C. accident D. result解析1. easily表達(dá)更容易,他買車的主要目的是為了上下班方便。答案為D。2. so muchthat,如此多以致于,這是一個(gè)固定結(jié)構(gòu)。too much不能和hat連用,我們經(jīng)常使用tooto。答案為A。3.根據(jù)上文修理花費(fèi)太多,所以就決定賣掉,而且下文也就是圍繞賣車而展開的。答案為C。4. be anxious to do sth急著干,Dave想了解是否有人急著買車,因?yàn)樗胭u掉自己的車。答案為A。5

29、前面已經(jīng)提到“it was falling to pieces”車很快要成碎片,所以沒有人愿意買。neither主要用于兩個(gè)人中沒有一個(gè),所以在這不合適。答案為C。6. upset表示“傷心的,難過的”。因?yàn)闆]人愿意買車,所以他很傷心。答案為B。7. “whats up”表示“怎么回事,發(fā)生了什么”。答案為B。8. “get”表示“得到”,在這兒是表示“你將得到的要比廣告花費(fèi)的多”。答案為C。9. advice表示“建議”,因?yàn)榍懊嬗幸痪洹皐hat about advertising it in the newspaper”這本就是一種建議“在報(bào)紙上登廣告怎么樣”答案為B。10. uses表示

30、“使用”,在這里表示車很省油。B. loses表示“丟失”;B. has表示“有”;spends表示“花費(fèi)時(shí)間、金錢、精力”。答案為A。11. no answer表示“回應(yīng)”,表示廣告登出去以后無人問津。A. doubt表示“懷疑”;B. help表示“幫助”;C. trouble表示“麻煩”,均不合題意。答案為D。12.這里表示來看車。答案為B。13.suitable表示“合適的”,在這里是問第二天早上十點(diǎn)鐘是否合適。答案為B。14. bring my wife表示把妻子帶來。A. recognize表示“認(rèn)出”;B. gain表示“獲得,得到”C. admire表示“羨慕”,均不合題意。答

31、案為C。15. “test”表示“測(cè)試”,買車的人將和妻子一道來測(cè)試一下車子。答案為D。16. “mean to”表示“打算做”在這兒是打算等買車的人。答案為B。17. “answer”在這里表示“回應(yīng)”,就是指那個(gè)看了廣告以后準(zhǔn)備來看車的人。答案為C。18“admit”表示“承認(rèn)”在這里表示他自己也不得不承認(rèn)自己的車看起來太舊了答案為D。19.這里是一個(gè)固定結(jié)構(gòu)“asas”。答案為A。20.“accident”表示“事故”。答案為C。111111高一年級(jí)完形填空練習(xí)及詳解(三)來源: 網(wǎng)絡(luò) 發(fā)布時(shí)間: 2009-09-05 編輯: 娟子 我來糾錯(cuò) 我來說兩句(0) 字號(hào):大 中 小The w

32、ord “plastic” comes from the Greek word “Platicos” and is used to describe_1_which can be easily shaped.The history of plastics is longer than you might_2_.In fact _3_ manmade plastics ever to appear on the market was made over a hundred years ago. It was called “celluloid(賽璐璐)”.It was discovered by

33、 both an Englishman and an American in the same year._4_it was the Americans who first produced it on a large scale during the year 1860.Everybody was _5_by this new material which could be moulded (用模子做) into shapes and _6_so cheap to buy.Poor young men _7_in cities with lots of smoke and dirt were

34、_8_ to buy white celluloid collars(領(lǐng)子).The collars were hard and uncomfortable. But they did not have to be sent to wash. The poor young men _9_ rub them clean every evening with soap and water! Poor mothers,_10_ had not been able to afford playthings _11_their children, were now able to buy them pl

35、aythings _12_ of celluloid. But celluloid had one very serious fault. It caught fire very easily. In fact it burned even more quickly than wood or cloth. There were many terrible accidents, particularly _13_ children. For years scientists worked hard to find a better plastic material than celluloid.

36、 They had _14_ success. Then in 1932 an American scientist called Baekeland produced a hard plastic material which did not burn. _15_ became known _16_ bakelite(酚醛塑料).Other plastic materials like bakelite were _17_ produced. They _18_ to make electrical fittings and plates and cups. Poor people like

37、d them because they were both cheap and safe, but rich people _19_ them because they were cheap, and because they could only be made _20_dark colours.1. A. something B. everything C. thing D. anything2. A. wish B. think C. want D. hope3. A. first B. at first C. for the first D. the first4. A. So B.

38、But C. And D. As5. A. surprised B. excited C. told D. frightened6. A. be B. were C. was D. is7. A. waiting B. running C. walking D. working8. A. going B. sure C. about D. able9. A. could B. ought to C. must D. should10. A. which B. who C. whom D. that11. A. for B. like C. in D. of12. A. done B. prod

39、uced C. worked D. made13. A. between B. on C. among D. about14. A. much B. great. C. never D. little15. A. The man B. He C. It D. The scientist16. A. as B. with C. by D. to17. A. already B. still C. also D. yet18. A. used B. hoped C. were used D. had19. A. took B. loved C. enjoyed D. disliked20. A.

40、in B. by C. from D. of解析1.這句話表示“plastic”這個(gè)單詞最早來源于希臘語(yǔ)“platicos”而且被用來描述那些容易成形的東西。答案為A。2.塑料的歷史要比你所想到的歷史長(zhǎng)。答案為B。3.這里表示最早的、最先的。答案為D。4.這里表示雖然英美兩國(guó)同年發(fā)現(xiàn),但是美國(guó)人率先生產(chǎn)。答案為B。5. be excited by“因?yàn)槎?dòng)”。答案為B。6.它的主語(yǔ)是“which”,而“which”指的是this new material,所以用單數(shù)。答案為C。7. working in cities是現(xiàn)在分詞短語(yǔ)做后置定語(yǔ)。這里指的是在城市里工作的貧窮的年輕人。答案為D。8

41、. be able to表示“能夠”。答案為D。9.could表示“能夠”。答案為A。10.這是一個(gè)非限定性定語(yǔ)從句,who指的是前邊提到的poor mothers,在非限定性定語(yǔ)從句中作主語(yǔ)。答案為who。答案為B。11. A表示“為”,在這里指的是那些貧窮的母親不能給孩子們買起玩具。答案為A。12. “made of”表示“由制成”。答案為D。13.“among children”表示“在孩子們當(dāng)中”。答案為C。14.“l(fā)ittle success”表示“沒有成功”。答案為D。15. It指的是前面所提到“a hard plastic material”。答案為C。16. “be know

42、n as”作為而著名。答案為A。17. also表示“也”,這里表示其它的塑料材料也被制造了出來。答案為C。18. “were used”表示“被用來”。答案為C。19. “dislike”表示“不喜歡”,這里表示富人們不喜歡塑料制品。答案為D。20. in dark colours這里表示“深色,黑色”。答案為A。高一年級(jí)完形填空練習(xí)及詳解(四)來源: 網(wǎng)絡(luò) 發(fā)布時(shí)間: 2009-09-05 編輯: 娟子 我來糾錯(cuò) 我來說兩句(0) 字號(hào):大 中 小In order to be a success in the American business world, you must “get a

43、long” with people. You must learn to conduct yourself in such a way _1_ you earn the affection and respect of others._2_ we have already pointed out, Americans_3_ business and pleasure. Therefore, learning how to _4_ informally can be a help with your American business _5_.Americans like to talk abo

44、ut a _6_of different topicssports, politics, cars, popular movies and television shows and personal interests. Many large American cities have sports teams. If you are _7_ with Americans in the United States, it would be a good idea to _8_out about the local sports teams so that you can _9_ in the a

45、lmost inevitable discussions about “how our _10_ will do this year” .Politics can be a _11_ topic unless everyone is of the same mind _12_.Limit your discussions to asking questions of your friends. Most Americans are _13_ owners and some are even obsessive about the subject. You can contribute _14_

46、talking about cars you have owned or by _15_ information you have read in automotive magazines. Americans watch television almost every night and attend movies regularly,_16_ naturally television shows and the _17_ movies become topics for discussions. If you are unable to _18_ American television o

47、r attend American movies, reading the _19_ section of such magazines as Time News week will keep you up to date on _20_is popular in America.1. A. which B. where C. as D .that2. A. While B. Since C. As D. Because3. A. mix B. enjoy C. like D. manage4. A. conduct B. appear C. behave D. chat5. A. frien

48、ds B. efforts C. contacts D. companies6. A. bit B. total C. group D. number7. A. meeting B. working C. living D. playing8. A. find B. learn C. go D. stay9. A. work B. participate C. succeed D. break10. A. group B. business C. company D. team11. A. common B. sensitive C. special. D daily12. A. politi

49、cally B. economically C. professionally D. personally13. A. house B. car C. business D. land14. A. to B. toward C. by D. through15. A. collecting B. sharing C. gathering D. analyzing16. A. so B. therefore C. thus D. hence17. A. interesting B. exciting C. excellent D. latest18. A. witness B. look C.

50、watch D. glance19. A. entertainment B. sports C. business D. movie20. A. which B. that C. what D. as解析1.suchthat在此引導(dǎo)的是結(jié)果狀語(yǔ)從句,意思為:你必須學(xué)會(huì)用這種方式指導(dǎo)你自己的行為以便能贏得他人的尊重。如用suchas就是定語(yǔ)從句,as作關(guān)系代詞在從句中做主語(yǔ)或賓語(yǔ)。而此句不缺此成分。答案為D2.As we have already pointed out表示:正如我們所指出的那樣。as引導(dǎo)非限制性定語(yǔ)從句答案為C。3.mix business and pleasure意思是:把工

51、作和娛樂混在一起。答案為A。4.learn how to chat informally是動(dòng)名詞短語(yǔ)作主語(yǔ),表示“學(xué)會(huì)如何進(jìn)行非正式交談”。答案為D。5.business contacts生意接觸/交往。答案為C。6.talk about a number of different topics談?wù)撚嘘P(guān)許多不同的話題。答案為D。7.work with sb.與某人一起工作。答案為B。8.find out查明,弄清。答案為A。9.participate表示“參與(談話之中)”。答案為B。10.第二段第一句有Many large American cities have sports teams.

52、答案為D。11.sensitive topic表示“敏感的話題”。答案為B。12.politically從“政治方面”(除非大家觀點(diǎn)或意見相同)。答案為A。13.car owners指“擁有汽車的人”。從下一句中可得知。答案為B。14.“by+動(dòng)名詞”表示以某種方式做某事。答案為C。15.share information you have read表示:把你所讀到的內(nèi)容或信息與他人分享。答案為B。16.so naturally表示“更不用說”。答案為A。17.latest movies最新上映的電影。答案為D。18.watch television看電視。答案為C。19.entertainm

53、ent section表示“娛樂版”。答案為A。20.on what is popular in America考查介賓從句,what在從句中充當(dāng)主語(yǔ),表示“有關(guān)于在美國(guó)很流行的東西”。答案為C。高一年級(jí)完形填空練習(xí)及詳解(五)來源: 網(wǎng)絡(luò) 發(fā)布時(shí)間: 2009-09-05 編輯: 娟子 我來糾錯(cuò) 我來說兩句(0) 字號(hào):大 中 小Youve been away from us for one year; you told us a lie which I came to know not long ago.On this special day for teachers across the

54、 country, I can _1_keep myself from telling your white lie to those who would lend me an ear.Do you still remember the happy _2_about six years ago We fixed our eyes upon you at your _3_.You, a beautiful young lady, _4_ us that you would live in our village.Soon after, we began to find you were part

55、 of your students and their simple honest parents. The villagers found their children _5_more time on their books _6_ after doing their homework and housework. Yet they still _7_ that one day you might leave. You _8_a smile all the time, which reduced to some degree their_9_ of your leaving. You went all out in the _10_ of your students, helping them not only in their studies but also in their tuition(學(xué)費(fèi)).You often emphasized to us the _11_ of ones life, so that must have been what you were _12_ in those five years!One cold morning when class began, you entered the room

溫馨提示

  • 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請(qǐng)下載最新的WinRAR軟件解壓。
  • 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請(qǐng)聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
  • 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁(yè)內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
  • 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
  • 5. 人人文庫(kù)網(wǎng)僅提供信息存儲(chǔ)空間,僅對(duì)用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對(duì)用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對(duì)任何下載內(nèi)容負(fù)責(zé)。
  • 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請(qǐng)與我們聯(lián)系,我們立即糾正。
  • 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對(duì)自己和他人造成任何形式的傷害或損失。

評(píng)論

0/150

提交評(píng)論