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已知变量x，y满足约束条件，则目标函数z＝x+2y的最大值为（ ）
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高二下学期数学《》真题及答案
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30分OnFridayIcalledmyparentswhoareintheirearly90snowTheywere41astheyadmittedtheydidn'tknowwhattosendmeormyadultkidsandtheirfamiliesforChristmaspresentsBothofthemveryrecentlyhave42serioushealthproblemsandI43themnottoworrythemselvesandtoldthemallofushadwhatwe44anddidn'tneedanythingmoreifthe45betold. Nothappywiththatthey46gettingusallsomethingeventhoughthisyearItwouldhavetobe47thanusualforitwaseasytosendtousall.Mymothersaidthatshewasgivingtheotherbrothersandsistersfruitand48basketswhichgavemeanidea.Iaskedherto49inthatcasegivingwhatevershewouldhavegivenustoalocalfoodbank.Oritismucheasierto50whatevermoneyshewouldspendonallofustothefoodbank.WhenIcheckedwiththemtheyboth51agreedandallofuswouldbehappyactuallyvery52toknowwehadbeenabletodonatefoodtoalocalfoodbank. Sheandmyfatherlikedthis53buthadnoideawhereafoodbankwouldbe.54myfatherwasquiteableand55indoinghisowncomputersearchesrecentlyhisabilityormotivationtodothishassteadilybeen56.Ilookedituprightthereandthen57notonebutthreelocalfoodbanksandthecenterforastate﹣widefoodbankwaslocatedrightthereintheirtown.Igavethemthe58andphonenumberwhichtheyaskedfor.Theyseemedvery59bythisproposedsolutionandIwasverygrateful.Anditisallsotrue.Iamoverthemoonhappywiththispresentidea.And60iseveryoneelse. 41.A.satisfied B.upset C.excited D.surprised 42.A.defeated B.solved C.suffered D.burdened 43.A.ordered B.encouraged C.criticized D.comforted 44.A.worried B.found C.needed D.sought 45.A.truth B.news C.information D.advice 46.A.gaveup B.dreamtof C.endedup D.insistedon 47.A.more B.faster C.slower D.less 48.A.flower B.goods C.food D.clothing 49.A.admit B.consider C.avoid D.allow 50.A.donate B.pay C.collect D.save 51.A.angrily B.willingly C.patiently D.deliberately 52.A.delighted B.disappointed C.astonished D.bored 53.A.basket B.idea C.story D.family 54.A.Unless B.When C.If D.Although 55.A.involved B.lost C.interested D.confident 56.A.increasing B.developing C.lacking D.declining 57.A.discovered B.realized C.understood D.recognized 58.A.name B.address C.picture D.money 59.A.stressful B.embarrassed C.relieved D.nervous 60.A.so B.neither C.such D.nor
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8分A.R.RahmanoneofIndia'smostwell﹣lovedmusiccomposerswoninternationalrecognitionwithtwoGrammyawards.LastyearhewontheOscarforhismusicinthehitfilmSlumdogMillionaire.ThisyearhehadhisfirstGrammywin.HepickeduptwoawardsonefortheBestCompilationSoundtrackforaMotionPictureSlumdogMillionaireandtheotherforBestMotionPictureSongforthesongJaiHofromthesamefilm.InthebestsongcategoryRahmanbeatsingerBruceSpringsteenandhissongTheWrestlerfromthemovieofthesamename.ThemodestRahmansaidThisismadGodisgreatagain. A.R.RahmanisacomposermusicProducermusicianandsinger.Hismusicscores乐谱andfilmsongssongschangedthecharacterofpopularmusicinIndiaintheearlyl990s.Rahman'smusiccompletelydissolvedthedividebetweenIndianandWesterncategories.Hepopularizedclassicalaswellasexperimentalmusic.Rahmanalsodiscoveredmanyyoungmusiciansanssingers. InterestinglytwootherIndianartistes艺人werenominatedforGrammysthisyear.UstadAmjadAliKhanIndia'smostwell﹣knownsarod萨罗达琴playerwasnominatedintheBestTraditionalWorldMusicAlbumcategoryforhisalbumAncientSounds.ZakirHussainthefamousTablamaestrowasnominatedintheBestClassicalCrossoverAlbumcategoryforhisalbumTheMelodyofRhythm.ZakirHusainwonaGrammylastyear.TheotherIndianswhohavewonGrammysinthepastarePanditRaviShankarVikkuVinayakramandVishvamohanBhatt. TheGrammyAwardscameintobeingin1958.ThesemusicawardsarepresentedeveryyearbytheNationalAcademyofRecordingArtsandSciencesoftheUSA.TheywereoriginallynamedtheGramophoneAwardsforthegramophone留声机wasthefirstinventionthatcouldrecordandreplaysoundanditwaswidelyusedthroughmostofthetwentiethcentury. 25.HowmanyfilmshasRahman'sprize﹣winningmusicbeenwrittenforsincelastyear? A.One. B.Two. C.Three. D.Four. 26.Whohasn'treceivedaGrammyawardinthepast? A.UstadAmjadAliKhan. B.PanditRaviShankar. C.ZakirHusain. D.VikkuVinayakram. 27.WhywastheGrammyAwardsonceregardedasGramophoneAwards? A.BecausethegramophonewasinventedintheUSAin1958. B.Becausethegramophonewasusefulanditsrangeofinfluencewaswide. C.Becausethegramophonehaslastedlongsinceitcameintobeing. D.BecausethegramophonewasfirstusedattheGrammyAwards. 28.Fromthispassagewecanlearn. A.Rahmanhasreceivedtwoawardssincelastyear B.Rahmanisacomposermusicproducermusicianandactor C.Rahmanusedtobemadbeforebeingfamous D.fiveIndianshavereceivedtheGrammyawards.
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8分Acouplewhothoughttheyhadafashionablemicropigweresurprisedwhentheirpetgrewintoa47﹣stonemonster. ThepigEstherheavierthanafullygrownpolarbearlivesintheirhousealongwithtwodogsandacat.ButownersSteveJenkinsandDerekWalterthoughtshewouldstayacutesmallpiggyneverweighingmorethanfivestone.Thetwo﹣year﹣oldpigisanInternetsuperstarandevenhasherownFacebookpage.EsthertheWonderPighasanamazing235000followers. HerownerStevefromOntarioCanadasaidFriendswouldcomeoverandsay'she'sgettingbigger'andDerekandIwouldsay'noshe'snot'.Bursoonshewasstandingtostealthingsoffthekitchencountersthesofabecamesmallerandofcoursetherewastheweightgain.Wejustadaptedandlovedhermore.Whatelsecouldwedo?Itwasn'therfaultandwewouldnevergiveupapet.AtnightwhenwelivedinGeorgetownshehadamattress床垫inthelivingroombutsincewemovedtothefarmshehasdecidedsheneedstobeclosetousandnowsleepsbesideourbedwithhermattressonthefloor.Shestillonoccasionclimbsupontoourbedforanapduringtheday. Estherisnowalmosttentimesherexpectedsize.Shealsoenjoysfreshfruitandvegetableslikeripebananas.Thecutepinkanimalspendsherdaysrootinginthegardenseatingsleepingandplayingwithherotherfriends. People'sreactiontomeetingEstherstillamazesusit'slikethey'remeetingamoviestar.Evennowpeopleareamazedbyhersizeandherawareness.Itisasifsheknowssheisfamousandthatisherrolethatsheischangingtheworld'sviewofherkindandtheiramazingabilitiestothinkfeelandbeloved. 32.Whenthecouplesawtheirpetpiggrowintoamonsterhowdidtheyfeel? A.Frightened. B.Calm. C.Nervous. D.Astonished. 33.WhichofthefollowingstatementsaboutthepetpigisNOTright? A.Sheisonlylivingwithherownersnow. B.Shecanstealthingsoffthekitchencounters. C.ShehasherownFacebookpagenow. D.Shelikestoeatfruitandvegetables. 34.WhatdoesthepetpigEstherdoeveryday? A.Shedoesnothingbuteatandlieonthesofasleeping. B.Shespendstimeinthegardenplayingwithherfriends. C.Sheperformsprogramsfortheowner'sfriends. D.Shegoesforwalkswithherowner. 35.Whatdoestheauthorwanttotellus? A.Pigsareascleverashumanbeings. B.Peoplecanfeeltheloveoftheanimals. C.Pigsactuallyneedtobelovedlikehumanbeings. D.Pigsaremorelikelytohefamousthanhumanbeings.
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8分Something'shappeningatthelowestpointonourplanetsome1388feetbelowsealevel. TheDeadSeaasaltlakeclosetoIsraelJordanandtheWestBankisshrinkingatanalarmingrate﹣about3.3feetperyearaccordingtotheenvironmentalistgroupEcoPeaceMiddleEast.Andhumanactionsarelargelytoblame. It'snotjustlikeonecountryispunishingtheDeadSeait'smorelikethewholeregionsaidphotographerMoritzKüstnerwhovisitedtheareainFebruarytoworkonhisseriesTheDyingDead. TheDeadSeaneedswaterfromtheothernaturalsourcessurroundingitsuchastheJordanRiverbasin.Butaroundthe1960ssomeofthewatersourcesitrelieduponwerediverted. Mineralextractionindustriesareanothermainreasonwhythewaterlevelsaredecliningexpertssay.TheDeadSea'smineralshavebeenpopularfortheirmedicalpowerandcanoftenbefoundincosmetics化妆品andotherconsumerproducts. Andthenofcoursethere'stheMiddleEast'shotdryclimatewhichmakesitdifficultforthelaketorefillitself. LastyearIsraelandJordansigneda$900milliondealinanefforttostabilizetheDeadSea'swaterlevels. ItinvolvesbuildingacanalfromtheRedSeatotheDeadSeasothatbothcountrieswouldbeabletonotonlysupplywatertoIsraelandJordanbutalsotopumpmuchneededwater﹣some300millioncubicmetersannually﹣intotheDeadSea. ThisisthemostimportantandsignificantagreementsincethepeacetreatywithJordanin1994saidSilvanShalomIsrael'senergyandwaterresourcesministeratthetime. Whetherthecanal﹣estimatedtotakethreeyearstocomplete﹣willworkoutpositivelyandasplannedremainstobeseen. 32.MoritzKüstnervisitedtheDeadSeato. A.shootTVseriesaboutpeople'sactionthere B.makeasurveyaboutthesealevel C.dohisphotographicserieswork D.researchintoenvironmentalproblems 33.WhichofthefollowingstatementsisNOTthereasonforthewaterlevels'declining? A.TheothernaturalsourcestheDeadSeareliedonwereswitched. B.TheDeadSea'smineralshavebeendugandusedinsomeproducts. C.TheMiddleEast'sclimatemakesthelakeitselfdifficulttostorewater. D.IsraelandJordanarethetwocountriestodestroytheDeadSea. 34.WhatmeasurehasbeentakentosavetheDeadSea? A.BringinginwaterfromtheRedSea. B.IntroducingwaterfromIsraelandJordan. C.TakingIsrael'senergyandwaterresources. D.Strugglingforinternationalsupport. 35.Whatdoesthepassagemainlytellsus? A.WhytheDeadSeaisdyingandthemeasuretakentosaveit. B.HowimportanttheDeadSeaisinIsraelJordanandtheWestBank. C.HowtosolvetheproblemthattheDeadSeaisbeingdestroyed. D.Protectingtheenvironmentisinnohurryallovertheworld.
8分LawandaWilsonwas72whenshedecidedtotestherluckanddrivefromherhomeinMidlandtoLasVegastovisitoneofhersonsinthesummer. Thoughshehadbeentherebeforeshecouldn'tfindherson'shouse.Wilsonendedupsleepinginhercarfordays.SheplannedtogobacktoMidlandbutitwasclearshewasnolongercapableoftakingcareofherself.Shewasn'teating.Shewasn'ttakingherpills.ItturnedoutshewasatthebeginningstageofAlzheimer's老年痴呆症. IknewthatmymotherwasstartingtolosehermemoryalittlebithereldestsonBlanesaidbutIneverdreamedthatitwouldbelikethis. BlaneandhisbrotherScotthadpromisedeachotherthattheywouldn'tputtheirmotherinanursinghome.ButwhenBlaneinvitedhismothertocometohishomehisdecisioncameasasurprisetohisnewwifeGeorgia. GeorgiaayoungwidowandBlanewerestillnewlywedswhenhismothercametolivewiththeminthewinterof2004.Georgiabarelyknewhermother﹣in﹣lawandsuddenlytheyhadtakenonthisresponsibility.Withherhusband'sthreechildrengrowntheythoughttheywerefinallygoingtokickbackandhavealittlemorefunintheirlives. Ithinkaboutthateveryday.Georgiasaid.Howdidthishappen?It'slikeadoptinganotherchild. Forninemonthstheystruggled.LaterGeorgialefthome.Butafterashortseparationtheywerereconciled和好.In2005thecoupledecidedtobuildasmallhouseinthebackyard.Theyhopeditwouldgivethemthepersonalspacetheyneededtosavetheirmarriage.Blaneusedallofhissavingstobuildthehousewhichhebelievedwouldbeworthit. 21.Whycouldn'tLawandaWilsonfindherson'shome? A.BecauseAlzheimer'sweakenedhermemory. B.BecauseAlzheimer'sweakenedhereyesight. C.Becauseshecouldn'tfocusherattentionondriving. D.Becauseshehadneverdriventoherson'shomeonherown. 22.WhywasGeorgiasurprisedwhenBlaneinvitedhismothertohishome? A.Becauseshewasnewlymarriedtohim. B.Becauseshehatedtolivewiththeelderly. C.Becauseshehadn'texpectedtotaketheresponsibility. D.Becauseshehadhadaquarrelwithhismother. 23.WhichofthefollowingstatementsisTRUEaccordingtothepassage? A.Scottdidn'twanttotakecareofhismother. B.Lawandadecidedtodrivetoherson'shomeandlivethere. C.NeitherofLawanda'ssonswouldsendhertoanursinghome. D.BlaneandGeorgiawerenewlymarriedandtheyhadfourchildren. 24.What'sthemainpurposeofbuildingasmallhouseinthebackyard? A.Tokeeptheirpets. B.Toletthechildrensleepin. C.Tolethismotherlivein. D.Tosavethemarriageofthecouple.
下列说法正确的是
15分Communicationandtransportationnetworksbringpeopletogether.Yetsometimespeoplethemselvescreatebarriers.Insomecountrieslawsstoppeoplefrom61movefreelyfromplacetoplace. Inthepastmanygroupsofpeopleweredeniedthe62freetotravelbecauseoftheirracereligionornationality.CountriesalsosetupCustomspostsat63themborders.ForeigntravelershastogothroughaCustomsinspectionbeforethey64allowtotravelinthecountry. Manyofthoseharriersalsoacted65barrierstocommunication.Whentwo66governmentdisagreedwitheachotheronimportantmatterstheyusuallywouldnotwanttheircitizenstoexchangenewsorideasfreely.Countriesoftentriedtokeepmilitaryor67industryinformationsecret. Todaypeoplehavetheabilitytotraveltocommunicateandtotransportgoodsmorequicklyandeasily68everbefore.Naturalbarriers69usedtobedifficultordangeroustocrossahundredyearsagocannowbecrossedeasily.Thebarriers70makebypeoplearenorsoeasytoovercomebutinspiteofallkindsofbarrierspeoplecontinuetoenjoytravelingandtheexchangeofgoodsandideas.
8分WASHINGTON﹣Thousandsofpublicschoolsstoppedteachingforeignlanguagesinthelastdecadeaccordingtoasurvey.ButanothercontrarytrendhaseducatorsandpolicymakersabuzzarushbyschoolsinallpartsofAmericatoofferinstructionsinChinese. SomeschoolsarepayingforChineseclassesontheirownbuthundredsaregettingsomehelp.TheChinesegovernmentissendingteachersfromChinatoschoolsallovertheworld﹣andpayingpartoftheirsalaries. Noonekeepsanexactcountbutroughcalculationsbasedonthegovernment'ssurveysuggestthatperhaps1600AmericanpublicandprivateschoolsareteachingChineseupfrom300orsoadecadeago.Andthenumberisgrowingexponentially成倍地. It'sreallychangingthelanguageeducationlandscapeofthiscountrysaidNancyC.Rhodesdirectoratthecenter.Otherindicatorspointtothesametrend.ThenumberofstudentstakingtheAdvancedPlacementtestinChineseintroducedin2007hasgrownsofastthatitislikelytopassGermanthisyearasthethirdmost﹣testedA.P.languageafterSpanishandFrenchsaidTrevorPackervicepresidentattheCollegeBoard. We'veallbeensurprisedthatinsuchashorttimeChinesewouldgrowtosurpassA.P.GermanMr.Packersaid. AdecadeagomostoftheschoolswithChineseprogramswereontheEastandWestCoasts.ButinrecentyearsmanyschoolshavestartedChineseprogramsinheartlandstatesincludingOhioandIllinoisintheMidwestTexasandGeorgiaintheSouthandColoradoandUtahintheRockyMountainWest. Americahashadthestudyofaforeignlanguagegrowbeforeonlytoseethebubbleburst.ManyschoolsbeganteachingJapaneseinthe1980safterJapanemergedasaneconomicrival.Butthousandshavedroppedthelanguagethesurveyfound.Japaneseisnottheonlylanguagethathasdeclined.ThousandsofschoolsthatofferedFrenchGermanorRussianhavestoppedteachingthoselanguagestoothesurveyfound. 25.What'sthemeaningoftheunderlinedwordabuzzinthefirstparagraph? A.Benoisylikethesoundofabee. B.Belivelyforvariousactivities. C.Causepeopletodiscusssomethinghotly. D.Motivatepeopletomarchbravely. 26.WhatcanweinferfromwhatMr.Packersaid? A.MoreandmorepeoplechooseChineseinA.P.test. B.A.P.testisthemostdifficultoneintheworld. C.ChineseismoreimportantthanSpanishandFrench. D.Chineseisanecessarysubjectinmostimportanttests. 27.Whatcanweknowfromthelasttwoparagraphs? A.ManyschoolsstartedChineseprogramsintheMidwesttenyearsago. B.ChineseprogramshavebeenstartedinmoreareasinAmericarecently. C.AmericanschoolshavestoppedteachingFrenchGermanandRussian. D.PeoplearegraduallyfondoflearningChineseandJapaneseinrecentyears. 28.Whatisthemainideaofthepassage? A.ChineseisbeinglearnedasanofficiallanguageinAmerica. B.ForeignLanguagesfadeinAmericanschoolsexceptChinese. C.TeachingChineseinforeigncountrieshasbecomeatrend. D.ForeignlanguagesarenolongerbeingtaughtinAmerica.
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下短文.短文中共有10处错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在此符号下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Iwanttotellyouanimpressivestoryhappeningduringmyfirstlesson.Onhearingthebellthestudentsranintotheclassroomasquicklyastheycan.ButaboyLiMingwhichfatherhaddiedamonthearlierwaslatefortheclass.Hequietstoodoutsidetheclassroom.Ismiledtohimandlethimcomein.Afterawhilehecriedonhisdesk.ThenIwalkedtoherandaskedwhathadhappened.Hetoldmethathismotherwasillandthathehastobuysomemedicineforher.Atthesametimeheapologizedmeforhislateness.MovingbyhiswordsIpraisedhimforhisdeedsanddecidedtosingasongnamedMotherforthestudents.Howtimeflied!ClasswasoverwhenIrealizedit.FromthestoryIfeltweshouldshowarespectforourparentanddoourbesttohelpthem.
1分﹣﹣Ithinkthepaperistakingyoualongtimetowrite. ﹣﹣Ionitforalmostamonthnow. A.worked B.wasworking C.amworking D.havebeenworking
10分Doyouknowhowtowriteagoodadvertisement?36 ●Theystressabenefit.ThemainsellingplanisnotcleverlyhiddenbutismadeimmediatelyclearforexampleHowtowinfriendsandinfluencepeople. ●Theymakepeoplecuriousabouttheadandinvitesreadership.ThekeyhereisnottobeoffensivebuttofocusonthestrongestinterestsandconcernsofyourtargetaudienceforexampleDoyoumakethesemistakesinEnglishappealstothereader'sdesiretoavoidembarrassmentandwriteandspeakproperly. ●37TheheadlineHowtoimproveyourtestscoreswhenyousleepattractsthereadersbecauseitpromisesusefulinformation.Anadthatprovidesinformationforreaderswillgethigherreadershipandbetterresponse. ●Theyareknowledgeable.38Ahelpfulwayistotellthereadersomethinghealreadyknowsprovingthatyoutheadvertiserarefamiliarwithhisindustryapplicationorrequirement. ●Theymakeastrongoffer.39Alladsshouldhaveanofferbecausetheoffercreatesimmediateresponsefrompeoplewhoarereadytobuynoworatleastthinkingaboutbuying.40 A.Theyprovideinformation. B.Letmetellyousomethingaboutthis. C.Theyneversellproductsthatarepoorinquality. D.Herearesomecharacteristicsofsuccessfulprintads. E.Withoutanofferthesepeoplearenotencouragedtoreachyou. F.Theyreflectahighlevelofknowledgeandunderstandingoftheproduct. G.Goodadstellthereaderswhattodonextandencouragethemtotakeitnow.
某同学做“用油膜法估测分子的大小”的实验． ①每滴油酸酒精溶液的体积为V0将该溶液滴一滴到水面上稳定后形成油膜的面积为S．已知500mL油酸酒精溶液中含有纯油酸1mL则油酸分子直径大小的表达式为d＝． ②该同学做完实验后发现自己所测的分子直径d明显偏大．出现这种情况的原因可能是． A．将滴入的油酸酒精溶液体积作为油酸体积进行计算 B．油酸酒精溶液长时间放置酒精挥发使溶液的浓度发生了变化 C．水面上痱子粉撒得太多油膜没有充分展开 D．计算油膜面积时将不完整的方格作为完整方格处理．
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下短文.短文中共有10处错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在此符号下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. ImadeabigmistakeinthechemicallessonlastFriday.Whenwewereinthelabmyheadwasstillfilledwiththeinformationsofafootballmatch.Sawtheothersbeginningtheexperiment.Ijustcopiedthemwithoutconsideringthattheteacherhadsaid.Allofthesuddenthematerialinthecuponmydeskwascaughtfire.Iwasshockedanddidn'tknowwhattodo.Unluckilymyteacherhelpedmeputoutthefireonsandquickly.Ifeelveryashamed.NotuntilthenIrealizethatcarelessnesswasharmfulinscience.
1分exactlywhatwaswrongwithhimthedoctorsgavehimacompleteexamination. A.Todiscover B.Discovering C.Discovered D.Havingbeendiscovered
30分LiJia14amiddleschoolgirlinMeishansouthwestChina'sSichuanProvincehasbeentryingtoputonweight.Shehopestosavehermotherwhois41withleukemia白血病.Sofarshehas42around10kilogramsinhalfayearandhopesthatitwillbeenoughto43hertodonatebonemarrow骨髓toherparent. Thedoctoraskedhermothertohavebonemarrowtransplantationin2015asherconditionbecame44daybyday.ThinkingthatLiJiamaybea45marrowdonorforhermotherthedoctorsuggestedthatthegirlgainsomeweightsince46weightsbetweenthedonorandthereceiverwillhelpgeneratebetterresultsforboth. Thegirldecidedtohavehigh﹣caloriefoodsthatarenormally47byboysandgirlsofherage.Friedpotatoesporkandvarioussnackswereall48servedinherdailydiet. Aftermonthsofeffortsthegirl49hergoalofincreasingto60kilograms.Whilemanyofherbeautifuldresseshavebecometoo50shesaidTheseclotheswillfitagainoneday.Butifmomcan'tbe51nobodywillbetheretoseemegrowingup. PuttingawayherbelovedclothingsheboughtherselfloosejeansandT﹣shirtswhichshethoughtwould52herfat. Butshehasbeenteasedbysomeofherclassmatesunawareofthe53.Toallthequestionsabouthowshehadgainedsomuchweightinsuchashortperiodshesimplyrepliedwitha54andthendroppedherhead. ThisMaythe55finallycameout.Shecandonateherbonemarrowtothefamilymember. 56asshewasthemother57overthedonationafterlearningaboutthesufferingand58itcouldbringtohergirl59LiJiarefusedtochangehermind. I'mnotafraidofallthese.TheonlythingI60isthatIwillJoseyousheclaimed. 41.A.diagnosing B.struggling C.developing D.suffering 42.A.reduced B.lost C.gained D.wasted 43.A.allow B.tell C.force D.persuade 44.A.less B.worse C.lighter D.better 45.A.potential B.rare C.generous D.brave 46.A.different B.extra C.similar D.heavy 47.A.refused B.produced C.designed D.donated 48.A.narrowly B.occasionally C.hardly D.regularly 49.A.realized B.recognized C.referred D.planned 50.A.loose B.old C.tight D.priceless 51.A.welcomed B.treated C.cured D.comforted 52.A.display B.show C.avoid D.cover 53.A.situation B.condition C.environment D.trend 54.A.hug B.smile C.shout D.laugh 55.A.causes B.projects C.results D.bills 56.A.Happy B.Curious C.Afraid D.Weak 57.A.argued B.turned C.cancelled D.hesitated 58.A.joy B.harm C.benefit D.crisis 59.A.unless B.so C.but D.as 60.A.know B.insist C.miss D.fear
如图所示一个半径为R的透明球体放置在水平面上一束蓝光从A点沿水平方向射入球体后经B点射出最后射到水平面上的C点．已知OA＝R该球体对蓝光的折射率为．则 ①它从球面射出时的出射角β为多少 ②若光在真空中的传播速度为c那么请推导出光从A点传播到C点所需时间t的表达式用cR表示
25分假定你是李华Tom是你的美国好友他三年前来过你所在的城市.最近他写信询问你所在城市的变化.请你根据以下要点给他写一封回信. 要点1.谢谢他的来信 2.列举城市的一些变化 3.欢迎他再次来玩. 注意1.词数100左右 2.可以适当增加细节以使行文连贯. .
1分Wehavealearningcenterkidsdoindependentandself﹣directedlearningactivities. A.which B.when C.where D.whose
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