extratrees用法
(完整版)完形填空式词汇意义用法测试
完形填空式词汇意义用法测试1.I hadn't seen him for years,but I____his voice on the telephone.A.realizedB.recognisedC.heardD.discovered2.The house is quiet because the carpets[地毯] are so____.A.heavyB.thickC.smoothD.long3.I didn't realize the girls were foreign.____English is very good.A.HerB.TheC.WhoseD.Their4.At breakfast time Mother told her child not to talk with his mouth____.A.wideB.openC.fullD.empty5.We arrived so late that all the retaurants were____.A.overB.closeC.shutD.finished6.The letter I had been expecting anxiously____me just now.A.arrivedB.receivedC.reachedD.got to7.I am afraid that there is no____for you in my car.A.placeB.roomC.seatD.space8.The North Star is always above the North Pole.The____of it doesn't changeA.positionB.shapeC.lightD.sight9.You'll be paid____money if you work late tonight.A.extraB.a lot ofC.muchD.little10.----Do you like fish? ----Well,it____what kind of fish.A.mattersB.expectsC.depends onD.minds11.Families once grew much of their own food.Today,however,most people____ their food from the market.A.cookB.haveC.keepD.get12.I'm very busy,so I can't____that problem with you for the moment.A.discussB.quarrelC.answerD.explain13.I don't____why he is so angry with us.A.believeB.understandC.thinkD.suppose14.You shouldn't eat so much chocolate____meals.A.exceptB.unlessC.betweenD.through15.When I asked him to have a drink with me,he said that he was in a hurry and had not a minute to_____.A.spendB.saveC.spareD.share16.Father will not_____us to use his recorder.A.haveB.letC.agreeD.allow17.The____to the moon took the astronauts three days.A.tripB.wayC.journeyD.flight18.The room was so quiet that she could hear the____of her heart.A.hittingB.beatingC.tappingD.striking19.The taxi driver was badly____when his car crashed into a wall.A.painedB.hitC.hurtD.wound20.These trees can't be grown in such a cold____as ours.A.weatherB.climateC.seasonD.space21.The government lost a great deal of____because of large increase in food prices.A.strengthB.supportC.powerD.progress22.The carrige was____by four white horses.A.rolledB.pushedC.drivenD.drawn23.Children____good food if they are to be healthy.A.haveB.recieveC.eatD.need24.I'm afraid you have no____but to come along with us.A.decisionB.interestC.choiceD.selection25.He ate what he could,and gave the____of the food to the birds.A.wasteB.partC.restD.most26.He told me he had been offered a very well-paid____abroad.A.serviceB.positionC.businessD.work27.I do_____I could speak French well.A.know B,want C.wish D.hope28.As he wa sill,he had to _____the party.A.missB.regretC.loseD.accept29.The____of the clock showed that it was time for dinner.A.handsB.fingersC.numbersD.arms30.The____from the forest fire could be seen miles away.A.smellB.steamC.smokeD.sight31.Because of the poor harvest wheat prices have____in the last six months.A.addedB.numpedC.developedD.dropped32.In today's newspaper it____that there will be strong wind this afternoon.A.tellsB.writesC.recordsD.says33.A heart that is being exercised beats more quickly than a heart that isat rest.Thus,a sleeping person has a_____heartbeat.A.warmerB.slowerC.higherD.louder34.Unless the workers' demands are____soon,there will be a strike.A.givenB.metC.permittedD.replied35.Mr Waker's new____fitted so badly across the should that he took it backto the shop. A.hat B.necklace C.shirt D.trousers36.I____her not to walk on the thin ice but she wouldn't listen.A.suggestedB.hopedC.warnedD.persuaded37.Police officers working on the murder have____hundreds of families.A.askedB.researchedC.questionedD.demanded38.Don't go too far into the sea,children,or the waves will____you off yourfeet. A.flow B.sweep C.beat D.take39.Her parents were both____,because she was out so late last night.A.sorryB.worriedC.lonelyD.calm40.What____you think Betty won't succeed?A.letsB.causes c.makes D.helps41.Mr.Smith is not in.Do you wish to leave any____?A.messageB.newsrmationD.idea42.It is____impossible to make such a long journey in such an old car.A.ratherB.veryC.fairlyD.quite43.The two men____all the way to the source of the river by boat.A.droveB.travelledC.rodeD.followed44.The world's tsllest man grew to be 8 feet,11.1 inches tall.No otherperson ever____this height.A.knewB.reachedC.grewD.became45.Voices were____at the argument between the two taxi drivers became more bad tempered.A.increasedB.repeated c.raised D.developed46.Mr and Mrs Green____a party for their daughter's twenty-first birthday.A.invitedidC.gaveD.called47.When you get to the highway,follow the____for Beijing.A.marksB.spotsC.waysD.signs48.It was a great____for him to be pleasant to people he didn't like.A.troubleB.effortC.sorrowD.horror49.Please____the milk carefully;I don't want it to boil over.A.look atB.seeC.noticeD.watch50.I washed this dress and the color____A.removedB.flowedC.ranD.went51.Because the children keeping interupting her whenever she reads a book,she is always____her place.A.missingB.losing c.forgtting D.looking52.It was too early in the____to expect many visitors to a seaside town.A.termB.seasonC.timeD.period53.The children____a line,and then walked into the cinema.A.gatheredB.formedC.stoodD.rowed54.Because of the low ceiling the bookshelf was much too____to go into theroom. A.tall B.high C.long D.big55.The two boys started to fight and an old man tried to____them.A.separateB.divideC.seizeD.share56.Many kinds of____animals are disappearing or have disappeared from theearth. A.tame B.unfriendly C.wild rge57.The rising____of living is as hard on country families as on city ones.A.priceB.costC.increaseD.food58.He won't____to buy some bread unless I tell him again.A.remindB.realizeC.rememberD.forget59.In this broadcast we'll study the____of music.A.soundB.rulenguageD.voice60.He fell in love with her at the first_______.A.scenceB.sightC.lookD.sign61.The seed had already taken root.It had begun to_____.A.growB.rootC.grow upD.raise62.A soldier ran all the_____from Marathon to Athens.A.roadB.wayC.pathD.route63.I____what her name is.I'm sure I know her face.A.rememberB.guessC.supposeD.wonder64.We couldn't cut the string because the____of the knife was not sharp.A.sideB.edge c.front D.point65.There are no big cities in the world_____air pollution.A.withB.withoutC.exceptD.besides66.The house was sold for $600,which was far more than its real____.A.costB.priceC.worthD.value67.What do you think would be the____of the ring,if I were to sell it?A.worthB.costC.valueD.price68.The Open University was started in order to help those who_____ having a university education when they were young.A.stopppedB.failedC.passedD.missed69.Today Paul is eating well,but_____.efullyB.wonderfullyC.harmfullyD.carefully70.The____river water goes 350 km out to sea.A.pureB.newC.sweetD.fresh71.She_____along the path,glad to be able to take her time.A.hurriedB.wanderedC.marchedD.tripped72.A European woman can____to live until the age of 74.A.supposeB.believeC.expectD.hope73.Breakfst is the first_____of the day.A.mealB.dinnerC.foodD.dish74.It is not_____for you to eat too much.A.wellB.fitC.goodD.necessary75.Bill doesn't____what people say about him.A.careB.matterC.wantD.interest76.The____of ice-cream sold increase sharply in summer months.A.priceB.amountC.numberD.quality77.Two of the children have to sleep in one bed,but the other three have ____ones.A.separateB.doubleC.differentD.lonely78.Things went well for him during his early life but in middle age his ____seemed to change.A.chanceB.successC.wayD.luck79.He climbed up into the tree and picked all the fruit____reach.A.nearB.withinC.insideD.at80.It will____time if we make the sandwiches the day before the picnic.A.spareB.save c.win D.get81.He said that he____my gift very much.A.delightedB.thankedC.welcomedD.appreciated82.Can you_____me a gallon of petrol?A.spareB.allowC.permitD.share83.Children can"t_____right from wrong.A.speakB.tellC.sayD.talk84.----Does your leg____? ----A little.A.painB.worseC.hurtD.wound85.How often do you____your watch?A.windB.turnC.whirlD.round86.Mr Johnson was____in the leg while fighting Japanese during the war.A.hurtB.harmedC.injuredD.wounded87.When we breathe,the oxygen in the air__with our blood and gives us life.A.fillsB.goesC.takes inD.mixes88.Few people could understand his theory at that time and even fewer would_______it.A.receiveB.acceptC.knowD.expect89.The manager wanted to know who wasn't_____fit for the office.A,good B.bad C.fit D.well90.Let's hurry to____that bus or we'll be late for school.A.takeB.catchC.rideD.get91.This building____an areas of 50 square meters.A.takesB.holdsC.coversD.includes92.It isn't quite____that he will be present at the meeting.A.sureB.certainC.rightD.exact93.Advice is something the wise don't need and fools won't_____.A.haveB.needC.catchD.take94.It is not good_____to show your learning before ladies.A.wayB.meansC.mannersD.enough95.She looked very happy when she ______the prize.A.wonB.enjoyedC.lookedD.thanked96.She ____ me why she wanted to leave early.A.toldB.expalinedC.warnedD.suggested97.That coat______her a week's wages.A.costB.spentedD.wasted98.She forgets to tell me which bus to ______A.haveB.takeC.travelD.ride99.If you work hard you will____a good teacher.A.haveB.makeC.followD.learn100.The police were____a search for the man who disapearedA.makingB.doingC.takingD.giving101.As I felt so much tired my doctor____me to take a holiday by the sea.A.consideredB.suggestedC.hopedD.advised102.They_____different conclusions from the facts.A.madeB.drewC.gotD.had103.I saw a_____good film on TV last night.A.lovelyB.prettyC.livelyD.nice104.The doorway is low,so _____ your head when you go in.A.mindB.take careC.expectD.attend105.The Dead Sea is below the sea_____A.surfaceB.level c.bottom D.top106.The police offered a ____to anyone who can give information about it.A.priceB.prizeC.rewardD.money107.If the boy had ____the dog alone,it wouldn't have bitten him.A.putB.setC.leftD.led108.As the train pulled out of the station,he began to ____the man opposite.A.tellB.sayC.talkD.quarrel109.I have such a bad cold that I have lost all____of smell.A.senseB.strengthC.tasteD.value110.If you want to phone him,you will have to____the number in the book.A.look atB.look afterC.look upD.look through111.When he____his burning eyes on me and laughed,I became very excited.A.fixedB.putC.lookedD.saw112.The child was told to_____for being rude to his uncle.A.excuseB.apologizeC.pardonD.thank113.Writing the composition_____George a whole afternoon.A.tookB.spentC.madeD.did114.At the beginning the whole party kept together,but by the end of theday the women and weaker men had fallen_______A.backB.awayC.behindD.out115.My uncle had promised to offer me everything he had and he____his words.A.tookB.keptC.madeD.held116.When I was a child,I ____many things from my mother.A.knewB.hadC.taughtD.learned117.On summer____many English men work in their gardens when they come back.A.eveningsB.nightsC.timesD.periods118.I_____him to arrive in time for dinner.A.hopeB.expectC.waitD.look for119.The shoes fitted her_____A.perfectlyB.fairlyC.rightlyD.nicely120.Jack is_____a black jacket today.A.having onB.wearingC.putting onD.dressed121.I could tell he was surprised from the____on his face.A.angerB.surpriseC.lookD.sight122.This pair of shoes isn't good but that pair is____better.A.ratherB.lessC.evenD.hardly123.If you ever have the____to go abroad to work you should take it.A.offerB.luckC.chanceD.advice124.I wish those boys wouldn't_____so much noise.A.doB.shoutC.makeD.cry125.I can hardly____the difference between these two words.A.pointB.speakC.tellD.talk126.After dinner the minister made a short____to the guests.A.talkB.pronuciationC.conversationD.speech127.Those are very pleasant rooms.How much do you____them?A.wantB.demandC.ask forD.ask128.A mistake is not serious unless it is_____.A.madeB.well-knownC.greatD.repeated129.He_____live in the country than in the city.A.prefers toB.likes toC.had betterD.would like130.You can____my surprise when I heard the news.A.supposeB.seeC.imagineD.believe131.Peter begged his neighbour to____him 20 pounds until the weekend.A.lendB.supplyC.borrowD.give132.I have always____you my best friend.A.regardedB.consideredC.trustedD.found133.I sat near the entrance for a long time____him,but he didn't arrive.A.expectingB.hopingC.wantingD.waiting134.Looking for new ways to do old jobs means_____.A.workB.goodnessC.successD.progress135.Bats don't see well.Instead they____where they are going.A.smellB.listen toC.watchD.ask136.I'm____to get the tickets for the show,as there are hardly any left.A.worriedB.anxiousC.eagerD.troubled137.The more you___things to chance,the less chance there is for you.A.leaveB.haveC.takeD.put138.This year the farmers were just able to gather in the____before the fine weather came to an end.A.fieldsB.plantsC.seedsD.harvest139.His_____of the plane was correct and could really fly.A.shapeB.patternC.designD.model140.He left in such a hurry that I____had time to speak to him.A.hardlyB.almostC.nearlyD.even141.In a low voice she____that someone was moving about upstairs.A.shoutedB.askedC.spokeD.whispered142.There is lots of food here,but we'll need____more.A.anyB.a fweC.evenD.little143.All life on the earth_____on the sun.A.livesB.feedsC.dependsD.keeps144.It seemed as if all of a____the animals had smelt danger in the air.A.momentB.suddenC.minuteD.shot145.Quite a few people watch TV only to_____time.A.wasteB.spendC.killD.pass146.I____an answer to my letter within a few days.A.hopeB.waitC.expect D,think147.He is____dark glasses to protect his eys from the sun.A.caryingB.bringingC.havingD.wearing148.It will do you good to______a hiloday.A.spendB.makeC.takeD.do149.I took the medicine but it didn't have any____on me.A.effectB.answerC.causeD.work150."What's your_____?" the doctor asked.A.troubleB.sicknessC.illnessD.matter151.The boy can't reach the branch,for it's_____above his head.A.goodB.fineC.wellD.nice152.We've made our plans and now we must put them into _____.A.workB.practiceC.promiseD.goods153,The printing press was invented in 1456.Before this time,books were prepared by_____.A.factoriesB.machineC.handD.memory154.The streets are wet because it has rained______all the morning.A.heavilyB.thicklyC.stronglyD.deeply155.He ran very fast and soon left the other runners_____.A.backB.behindC.awayD.far156.She was standing by an electric heater,and her nightdress____fire.A.caughtB.setC.tookD.had157."Here is the money I promised",he said.I always____my promise.A.agreeB.followC.makeD.keep158.Students should answer seven of the____questions.A.belowB.followingC.underD.added159.He came to my house last night and invited me to join in a___of footballA.matchB.teamC.gameD.party160.Mary said that she was____able to wash the plates herself.A.tooB.quiteC.muchD.plenty161.Kindness is the most important____a man can have.A.answerB.qualityC.habitD.charactor162.He had a good____of the exam result when he saw his daughter's face.A.reportB.thoughtC.ideaD.news163.After the party we all thanked Freda for____us a lovely evening.A.lettingB.askingC.enjoyingD.giving164.Freda said that she was very happy to_____us all.A.have B,take C.accept D.get165.Travelling across the country was once a____journey,but it's quite safe now.A.terribleB.dangerousC.expensiveD.noisy166.After two hours of hard fight,the southern army won the_____.A.forceB.powerC.warD.battle167.The college got some money by selling one of its old_____pictures.efulB.helpfulualD.valuable168.Since he began work,he hasn't____asked his father for money.A.greatlyB.very muchC.badlyD.ever169.I could go to the party because of a ______cold.A.quickB.surprisingC.suddenD.hurried170.When the headmaster____the room,all the pupils stood up.A.sawB.enteredC.appearedD.came171.You have to____to borrow my bike without asking my permission.eB.choiceC.pleasureD.right172.The shop assistant____me so much for the book.A.costB.chargedC.requiredD.asked173.I knew the visitor was a woman,because I could hear her_____.A.soundB.voiceC.noiseD.words174.The train leaves London at 10:00 and_____Bristol at 12:00.A.reachesesC.endsD.finishes175.I have promised to help you and I'll______my words.A.holdB.keepC.followD.take176.Like airplane pilots,people who_____must know how to direct the course of their ships.A.rideB.huntC.sailD.travel177.Henry Hundson discovered the Hundson River.That is why this body of the river is______after him.A.followedB.lookedC.flowingd178.It was midnight I didn't know the party would finish______like that.stteC.longD.at last179.Thses shoes are too dear;I am looking for_____ones.A.lowerB.cheaperC.dearerD.better180.The clock_____and we realized it was too late.A.struckB.hitC.turnedD.rang181.It was a hiloday but a paper on the shop-door said"____at 10:00"A.BeginB.OnC.OpenD.Doing182.Our table-tenis team____with the others from all over the world for the world cup.A.matchedB.playedC.triedD.fought183.----Can I have a drink? ----____yourself.A.HaveB.DrinkC.HelpD.Get184.It was ten o'clock in the evening but the sky was still_____.A.whiteB.lightC.sunnyD.fine185.Business has______Mr Staone here.A.fetchedB.takenC.drivenD.brought186.A kind of glass dish that____heat is useful.A.resistedB.rejectedC.defendsD.keeps187.The city's underground_____more people than the buses.A.bringsB.sendsC.fetchesD.carries188.I've______my things at home.A.forgetB.forgottenC.leftD.lost189._____at the door before you come into the room.A.KnockB.HitC.TouchD.Strike190.I_____to him for what I said.A.excusedB.apologizedC.pardenedD.expalined191.The car was repaired but not quite to the owner's________.A.joyB.pleasureC.satisfactionD.decision192.----How can we settle the problems?----Well,we must____it to her own judgement.A.believeB.expressC.leaveD.depend193.I'm very sorry.I've____your book at home.I will bring it tomorrow.A.forgottenB.leftidD.kept194.The reilway runs through a____under the mountain.A.pipeB.tunnelC.canalD.highway195.She had a nature that quickly_____her friendship of her workmates.A.gotB.wonC.hadD.caught196.He_____the cooking yesterday.A.didB.madeC.hadD.took197.It would be_____a risk to let the child go to school by himself.A.runningB.followingC.passingD.carrying198.Much_____to be settled.A.remainedB.rememberedC.leavesD.kept199.It_____them $200 a year to run a car.A.spendsB.costsC.takesD.pays200.----Who broke the window? ----I___.A.hadB.brokeC.wasD.did201.The horrible noise from the man's room simply_____me mad.A.putB.causedC.droveD.turned202.His father died and______him a lot of money.A.gaveB.leftC.sentD.offered203.The hotel was very different from what the advertising____us to expect.A.madeB.shownC.ledD.told204.I_____my watch by the church bell.A.putB.windC.setD.correct205.What would you_____to eat tonight?A.likeB.hopeC.wantD.wish206.The teacher_____her new students to be diligent.A.hopesB.demandsC.hasD.expects207.The two brothers____every day and there was no love lost between them.A.quarrlledB.hatedC.lovedD.worked208.It's a fine____! What do you make of it? Piccaso's?A.jobB.workC.bookD.table209.I have been looking for you everywhere.This is the____place in the world I would have expected to find you.A.rightstC.justD.only210.----Mr Lee wishes to see you. ----_____him in.A.BringB.LeadC.PointD.Show211.The____why Ellain didn't turn up was not made clear.A.causeB.truthC.reasonD.matter212.I want to learn more about the American political system but I don't know where to get the_______.A.conversationrmationC.situationD.article213.He stayed under water for two minutes,and then swam to the____.A.levelB.groundC.surfaceD.river.214.It is very difficult to____a secret from my family.A.keepB.learnC.takeD.hear215.He has very good manners and is very____when he speaks to people.A.shyB.politeC.proudD.anxious216.We had a long meeting yesterday.It____four hours.A.continuedB.keptC.spentsted217.It was not easy for him to buy good shoes because he had such a big _____of feet.A.coupleB.sizeC.numberD.pair218.The man who makes no mistakes usually makes_____.A.everythingB.nothingC.something D,anything219.It can take up three months to_____a man to do this work.A.guideB.raiseC.trainD.learn220.Look,what Father_____me when he came home from woprk.A.tookB.broughtC.carriedD.fetched221.It was the longest film I have ever seen,it____three hours.A.stayedB.finishedpletedsted222.Ellen was not given____to leave though it was getting dark.A.excuseB.rightC.permissionD.decision223.No one was able to think_____the noise was going on.A.duringB.asC.sinceD.because of224.I wondered whether you wouild like to___to the theater tomorrow.A.visitB.go awayC.go outD.walk out225.He____to all his friends that he was getting married.A.toldB.spokeC.announcedD.replied226.She said she could not____all the information given in the broadcast.A.believeB.expectC.actD.rely227.can you_____to arry that heavy box by yourself?A.arrangeB.offerC.manageD.prepare228.She____me why she wanted to leave today.A.explainedB.saidC.toldD.suggested229.When my sister phoned me,I could hear clearly what she was____.A.speakingB.talkingC.sayingD.telling230.Facing danger,he always_____calm.A.seemsB.remainsC.becomesD.appears231,I should like to try that coat on,but I don't know if it is my___.A.shapeB.sizeC.modelD.pattern232.No,thank you.I don't____sugar in tea.A.takeeC.drinkD.put233.No matter how strong the wooden floor is,____can bite their way .A.mouseB.miceC.catsD.worms234.It is rather cold today,but tomorrow we expect the temperature to__A.developB.growC.increaseD.rise235.She____the wet clothes on the grass to dry them in the sun.A.spreadB.openedC.droppedD.hung236.My sister cleans the house from____to bottom when she was expecting him.A.roofB.groundC.floorD.top237.There are usualy at least two____of looking at every question.A.meansB.waysC.directionsD.manners238.The thief ran away at the ____of a policeman.A.sightB.screenC.soundD.seeing239.The book is not_____what we paid.A.worthB.valuableC.costD.dear240.I don't_____to know much about American country music but I know what knid of songs I like.A.believeB.pretendC.imagineD.suppose241.The city was____to me,and I don't know where to go.A.interestingrgeC.strangeD.exciting242.My English teacher_____me to try for a place at the university.A.insistedB.suggestedC.hopedD.encouraged243.When I was at school we had to learn a poem by____every week.A.earB.mouthC.heartD.eye244.The sports meet was put off till the fog_____.A.stoppedB.clearedC.passedD.went245.The cost is_____for me.A.too muchB.so muchC.very muchD.much too246.It is no____arguing about it,because he will never chnage his mind.A.timeB.whileeD.help247.As the storm drew near,black clouds were____over the sky.A.smoothingB.wanderingC.runningD.gathering248.Every time he tried to start the car,the wheels____deeper into the mud.A.stayedB.sankC.fellD.dropped249.He spoke so quickly that I didn't _____what he said.A.receiveB.acceptC.takeD.catch250.Her husband felt it would be silly to_______the color of the certain before they had painted the room.A.changeB.findC.chooseD.lose1----5BBDCC6---10CBAAC11—15DABCC16—20DDBCB21—25BDDCC 26—30BCAAC31—35BDBBC36—40CCBBC41—45ADBBC46—50CDBDC 51—55BBBAA 56—60CBCCB 61—65ABDBB 66—70DCDDD 71—75BCBCA 76—80BADBB 81—85DABCA 86—90DDBCB 91—95CCDCA 96-100ABBBD 101-105DBBAB106-110CCCAD111-115ABBCB116-120DABAC121-125CDCCD 126-130DCDDC 131-135ABADB 136-140BADCA 141-145DCCBC 146-150CDCAA 151-155CBCAB 156-160ADBCB 161-165BCDAB 166-170DDDCB 171-175DBBAD。
extra用法归纳
extra用法归纳一、extra 的词性和释义1、形容词额外的；分外的；外加的特别的；格外的2、名词额外的事物；另外收费的事物（电影里的）临时演员；群众演员3、副词额外；另外；外加二、extra 作为形容词的用法11 表示“额外的；分外的；外加的”There is an extra charge for delivery 送货要额外收费。
We need an extra pair of hands 我们需要多一个人手。
111 表示“特别的；格外的”She has that extra something that makes her stand out 她有那种特别的气质使她脱颖而出。
This dress has an extra layer of fabric for warmth 这件连衣裙有一层额外的布料以增加保暖性。
三、extra 作为名词的用法12 表示“额外的事物；另外收费的事物”The hotel offers free breakfast, but lunch and dinner are extras 酒店提供免费早餐，但午餐和晚餐是额外收费的。
These are all extras that come with the deluxe version of the software 这些都是该软件豪华版附带的额外内容。
121 表示“（电影里的）临时演员；群众演员”Hundreds of extras were needed for the battle scene 那场战斗场景需要数百名临时演员。
The extras were all dressed in period costume 群众演员都穿着那个时期的服装。
四、extra 作为副词的用法13 表示“额外；另外；外加”You can have an extra slice of cake if you like 如果你愿意，你可以再吃一片蛋糕。
Kaggle新手入门之路（完结）
Kaggle新⼿⼊门之路（完结）学完了Coursera上Andrew Ng的Machine Learning后,迫不及待地想去参加⼀场Kaggle的⽐赛,却发现从理论到实践的转变实在是太困难了,在此记录学习过程.⼀:安装Anaconda教程⼤多推荐使⽤Jupyter Notebook来进⾏数据科学的相关编程,我们通过Anaconda来安装Jupyter Notebook和需要⽤到的⼀些python库,按照以下⽅法重新安装了Anaconda,平台Win10⼆:Jupyter Notebook参照以下两篇⽂章配置好了Jupyter Notebook,学习了相关的基本操作启动:在cmd或Anaconda Prompt下输⼊jupyter notebook新建:Files页⾯右侧'New'运⾏当前cell:Ctrl+Enter代码补全:Tab查看⽅法⽂档:Shift+Tab复选cell:Shift+上下键删除cell:双击D撤销删除:Z保存当前Notebook:S关闭⽂档:Home页⾯选中⽂档后'Shutdown'关闭服务器:终端中按两次Ctrl+C显⽰matplotlib图表:%matplotlib inline中断运⾏:I三:NumpyNumpy是⼀个⽤于进⾏数组运算的库Numpy中最重要的对象是称为ndarray的N维数组类型⼀般使⽤如下语句导⼊:import numpy as np创建数组:numpy.array(object, dtype = None, copy = True, order = None, subok = False, ndmin = 0)可以⽤np.dtype()定义结构体数组维度:ndarray.shape数组维数:ndarray.ndim调整数组维度:ndarray.reshape(shape)创建未初始化数组:numpy.empty(shape, dtype = float, order = 'C')创建零数组:numpy.zeros(shape, dtype = float, order = 'C')创建⼀数组:numpy.ones(shape, dtype = float, order = 'C')⽤现有数据创建数组:numpy.asarray(a, dtype = None, order = None)按数值范围创建数组:numpy.arange(start = 0, stop, step = 1, dtype),类似的有linspace()和logspace()切⽚:b=a[start:stop:step],可以⽤...代表剩余维度整数索引:每个整数数组表⽰该维度的下标值,b=a[[r1, r2], [c1, c2]]布尔索引:返回是布尔运算的结果的对象,可以⽤&或|连接()分隔的条件在 NumPy 中可以对形状不相似的数组进⾏操作,因为它拥有⼴播功能,我的理解是,⼴播是⼀种维度的单⽅向拉伸数组迭代:numpy.nditer(ndarray)或ndarray.flat数组长度:len(arr)访问第i个元素:⼀维数组⽤a[i],多维数组⽤a.flat[i]数组转置:ndarray.T数组分割:numpy.split(ary, indices_or_sections, axis),第⼆项的值为整数则表明要创建的等⼤⼩的⼦数组的数量,是⼀维数组则表明要创建新⼦数组的点。
extra的用法和例句
extra的用法和例句extra有额外的;特别地等意思，那么你知道extra的用法吗?下面跟着小编一起来学习一下，希望对大家的学习有所帮助!extra的用法：extra的用法1：extra的基本意思是外加的,常指数量上的增加或价格方面另外收费的。
extra的用法2：extra在句中可用作表语或定语。
extra的用法3：extra无比较级和最高级。
extra的用法4：extra也可用作名词表示另外收费的事物拍电影时临时演员报纸的号外。
例如:At this hotel a hot bath is an extra.在这家旅店,热水浴另外收费。
We need a thousand extras for big crowd scene.在拍摄群众大场面时,我们需要上千名临时演员。
Late evening extra!晚间最新号外!extra的用法5：extra还可用作副词表示特别地非常,可修饰其他副词或形容词。
extra的用法例句：1. She gave him an extra scoop of clotted cream.她多给他加了一勺浓缩奶油。
2. The President is determined to go the extra mile for peace.总统决心为实现和平而加倍努力。
3. Theres an extra blanket in the bottom drawer of the cupboard.壁橱最下面的抽屉里还有一条多余的毯子。
4. Police warned motorists to allow extra time to get to work.警方告诫驾车者出门上班要留出富余时间。
5. Stay in bed extra late or get up specially early.起床过晚或过早。
6. It is incumbent upon all of us to make an extra effort.我们所有人都必须加倍努力。
extra的用法
extra的用法【一级标题：extra的用法】【二级标题1：extra的含义与用途】在英语中，extra是一个广泛使用的词汇，通常作为副词、形容词或名词使用。
它可以表示额外的、附加的或超出正常程度的事物或特征。
extra在不同场景下有多种用法，本文将详细探讨其不同方面的应用。
【二级标题2：额外费用和附加项目】作为名词，extra指涉及到某项服务、商品或活动之外需要支付的费用或项目。
例如，在旅行中，酒店房价可能包含基本设施和服务费用，但如果你需要享受一些附加设施如SPA、健身房等，则需要支付额外费用；类似地，在餐馆就餐时，如果需要点单时额外增加配料或菜品，则也需要支付相应的extra费用。
因此，在进行旅行和消费活动时，我们要注意这些附加项目可能带来额外支出。
【二级标题3：extra转义字符】在计算机编程中，extra还有一个重要的意义。
它被称为转义字符（escape character），通常以反斜线（\）开头并接着一个字母或其他符号。
例如，\n代表换行符；\t代表制表符；\”代表引号。
extra在这里被用来告诉计算机对紧接着的字符进行特殊处理，以实现一些按键无法直接输入的功能。
这在编写程序或操作系统命令时非常有用。
【二级标题4：extra时间和能量的应用】在日常生活中，我们也可以使用extra来描述时间和能量方面的特征。
比如，“at an extra hour”意味着“在一个额外的小时之后”，表示某事需要在现有时间基础上延长一小时完成；“extra effort”则表示付出了额外努力。
这些表达方式可以帮助我们更准确地传达信息，使对方更好地理解我们所指的含义。
【二级标题5：extra作为副词的含义】除了以上提到的情况外，extra还可作为副词使用，修饰动词或形容词，表达不同程度的增加、超过或突出。
例如，“He worked extra hard to finish the project” 表示他加倍努力完成了这个项目；“She looks extra beautiful in that dress” 表示她穿着那件连衣裙看起来格外美丽。
extra的用法总结大全
extra的用法总结大全（学习版）编制人：__________________审核人：__________________审批人：__________________编制学校：__________________编制时间：____年____月____日序言下载提示：该文档是本店铺精心编制而成的，希望大家下载后，能够帮助大家解决实际问题。
文档下载后可定制修改，请根据实际需要进行调整和使用，谢谢!并且，本店铺为大家提供各种类型的经典范文，如英语单词、英语语法、英语听力、英语知识点、语文知识点、文言文、数学公式、数学知识点、作文大全、其他资料等等，想了解不同范文格式和写法，敬请关注!Download tips: This document is carefully compiled by this editor.I hope that after you download it, it can help you solve practical problems. The document can be customized and modified after downloading, please adjust and use it according to actual needs, thank you!In addition, this shop provides various types of classic sample essays, such as English words, English grammar, English listening, English knowledge points, Chinese knowledge points, classical Chinese, mathematical formulas, mathematics knowledge points, composition books, other materials, etc. Learn about the different formats and writing styles of sample essays, so stay tuned!extra的用法总结大全extra的意思adj. 额外的，补充的，附加的,特大的，特别的n. 附加物，额外的事物,临时演员,号外,上等产品，上品adv. 额外地,格外地，特别地extra用法extra可以用作形容词extra的基本意思是“外加的”,常指数量上的增加或价格方面“另外收费的”。
it考点讲义：it用作形式主语和形式宾语的用法归纳总结- 高考英语语法二轮复习专题.docx
高中英语语法高考二轮复习it考点讲义【精讲版】it用作形式主语和形式宾语的用法归纳总结一、用作形式主语当不定式、动名词、从句等用作主语时，避免头重脚轻，通常在句首使用形式主语厄而把真正的主语放在句子末尾。
如：It is stupid to do such a thing.做这种事真蠢。
It's no good sitting up too late.熬夜没有好处。
It is necessary that he should be sent there at once.有必要马上派他到那里去。
注：类似以下句子中的il也可视为形式主语：It happened that the harvest was bad in 1988.碰巧1988 年的收成很不好。
It seems that she is afraid to tell them about it.似乎她怕将此事告诉他们。
二、用作形式宾语当不定式、动名词、从句等用作宾语且其后跟有宾语补足语时，就应在宾语补足语前使用形式宾语，而将真正的宾语移至句末。
如：I've made it a rule never to hurry,我已养成凡事从容不迫的习惯。
Do you think it possible to root out crime?你认为可以根除犯罪吗？He found il difficult to breathe at high altitudes.他觉得在高空呼吸困难。
注：通常意义的形式宾语主要见于真正宾语为不定式、动名词、从句等且其后跟有宾语补足语时的情形，即用于“动词+it+宾语补足语+真正的宾语”这样的结构，但以下两类形式宾语却比较特殊，其后没有宾语补足语:1.由于介词后通常不能直接跟that从句作宾语，有个别特殊结构就在介词后先接it作形式宾语，再跟that从句。
如：You may depend on it that it is true.你可以相信这是真的。
Put短语用法集锦
Put⑴ put away1. 抛弃；舍弃Put all negative thoughts away.抛弃所有消极的思想2. 【非正式用语】吃掉，喝掉：乐意并很快地吃光或喝光（食物或饮料）Put away the dinner in just a few minutes.就在几分钟内吃光了晚餐3. 【非正式用语】关进精神病医院4. 埋葬The injured cat was put away.这个受伤的猫被杀死了5. 把...收起;放好Put away the tools after work, will you?工作结束后请把工具收拾好。
⑵ put in1. 提交：提出…的正式提议Put in a plea of guilty.正式提出犯罪诉讼2. 插入，插话He put in a good word for me.他插进来为我说了一句好话3. 花时间：在某一场所或工作上花费（时间）The inmate had put in six years at hard labor. She put in eight hours behind a desk. 犯人已经做了六年的苦工。
她在花了八小时办公4. 种植We put in 20 rows of pine trees.我们种植了20排松树5. 【航海】进港：进入口岸或港口The freighter puts in at noon.货轮中午时进入港口6.(使)在内; 把…放于…中He put his head in at the window.他从窗口把头伸进来。
Put sugar in coffee, please.请把糖放在咖啡里。
7.做, 履行She always puts in an hour's reading before breakfast.早饭前她总是读一小时书。
8.选举…执政; 任命He put in a caretaker.他任命了一个管理员。
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extratrees用法
Extra Trees (Extremely Randomized Trees) 是一种集成学习算法，它是随机森林的一个变体。
随机森林是一种基于决策树的集成学习算法，
它通过对不同子集的数据构建决策树，并结合它们的结果来进行分类或回归。
与普通随机森林不同的是，Extra Trees 在构建决策树时引入了更多
的随机性，从而增强了模型的泛化能力。
Extra Trees 通过在构建决策树时随机选择特征剪裁点和划分点，来
降低决策树构建过程中的方差。
在普通的随机森林中，每个决策树的特征
剪裁点和划分点都是根据特征的重要性进行选取的，而 Extra Trees 使
用了更多的随机性，使得特征剪裁和划分点的选择更为随机。
这样做的好
处是可以降低过拟合风险，增强模型的健壮性。
Extra Trees 的主要优势包括以下几点：
1. 降低方差：Extra Trees 通过引入更多的随机性，减少了决策树构建过程中的方差。
这意味着 Extra Trees 在面对不同的训练集时，
模型的性能波动性较小，具有更好的泛化能力。
2. 减少过拟合：由于 Extra Trees 的决策树是通过更多的随机
性构建的，其模型复杂度相对较低，有助于减少模型在训练数据上的过拟
合现象，并且能够更好地适应新的未知数据。
3. 增强特征的重要性评估：Extra Trees 在构建过程中，通过统计多个决策树中每个特征被用来划分样本的次数，来评估特征的重要性。
这个评估可以用来筛选出重要的特征，从而进行特征选择和维度约简。
4. 更快的训练速度：由于 Extra Trees 在构建决策树时引入了
更多的随机性，因此每棵决策树的构建时间相对较短。
这使得 Extra Trees 在大规模数据集上的训练速度更快。
Extra Trees 的使用方法与随机森林类似，可以分为以下几个步骤：
2. 构建模型：使用 Extra Trees 的库或模块，可以直接调用相
关函数进行模型的构建。
在构建模型时，需要指定模型的超参数，如决策
树数量、最大深度、特征剪裁百分比等。
3. 训练模型：使用训练数据集对模型进行训练。
在训练过程中，Extra Trees 会根据指定的超参数和训练数据集构建多棵决策树，并通过
集成它们的预测结果来优化模型。
4. 模型评估：使用测试数据集对训练好的模型进行评估。
可以使用一些常见的性能评估指标，如准确率、精确率、召回率和F1值。
5. 特征选择：根据构建过程中统计的特征重要性评估，可以选择保留重要的特征，剔除不重要的特征，以达到特征选择和维度约简的目的。
Extra Trees 还有一些常见的应用场景：
2. 回归问题：Extra Trees 也可以用于解决回归问题。
对于回归问题，Extra Trees 会构建一组决策树，并通过平均或投票的方式进行集成，并预测目标变量的数值。
3. 异常检测：由于 Extra Trees 引入了更多的随机性，因此它
对于异常点的容忍度更高。
可以通过训练 Extra Trees 模型，并将样本
的预测误差作为异常检测的指标。
总结起来，Extra Trees 是一种基于决策树的集成学习算法，在构建决策树时引入了更多的随机性，从而减少过拟合，提高泛化能力。
它可以用于分类、回归和异常检测等问题，并且相对于传统随机森林算法，Extra Trees 具有更快的训练速度。