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Write an English composition in 120﹣150 words according to the instructions given below in Chinese....
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高三下学期英语《》真题及答案
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Directions:WriteanEnglishcompositionin120–150words
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8分WecanvideochatwithastronautsaboardtheInternationalSpaceStationandwatchlivefootagefromthefrozenheightsofEverest.Butcommunicatingwithasubmarine潜艇oradiverisnotsoeasy.Thelackofpracticalmethodsforsharingdatabetweenunderwaterandairbornedeviceshaslongbeenafrustrationforscientists.Thedifficultystemsfromthefactthatradiosignalsworkperfectlyinairtravelbutpoorlyinwater.Sonar声呐signalsusedbyunderwatersensorsreflectoffthesurfaceofthewaterratherthanreachingtheair. NowresearchersatMIThavedevelopedamethodwiththepotentialtorevolutionizeunderwatercommunication.Whatwe'veshownisthatit'sactuallyfeasibletocommunicatefromunderwatertotheairsaysFadelAdibaprofessoratMJT'sMediaLabwholedtheresearch. TheMITresearchersdesignedasystemthatusesanunderwatermachinetosendsonarsignalstothesurfacemakingvibrations震动correspondingtothelsandOsofthedata.Asurfacereceiverthenreadsanddecodesthesetinyvibrations.TheresearcherscallthesystemTARF.Ithasanynumberofpotentialreal﹣worldusesAdibsays.Itcouldbeusedtofinddownedplanesunderwaterbyreadingsignalsfromsonardevicesinaplane'sblackboxanditcouldallowsubmarinestocommunicatewiththesurface. Rightnowthetechnologyislow﹣resolution.TheinitialstudywasconductedintheMITswimmingpoolatmaximumdepthsofaround11or12feet.ThenextstepsfortheresearchersaretoseeifTARFisworkableatmuchgreaterdepthsandundervaryingconditions﹣highwavesstormsschoolsoffish.Theyalsowanttoseeiftheycanmakethetechnologyworkintheotherdirection﹣airtowater. Ifthetechnologyprovessuccessfulinreal﹣worldconditionsexpecttextingwhiledivingtobethelatestunderwaterfashion. 1WhatdoestheauthormainlytalkaboutinParagraph1? A.Thefutureofvideochatunderwaterandinair. B.Thefrustrationsofdevelopingunderwaterdevices. C.Thedifficultyofcommunicationfromwatertoair. D.Thecurrentsituationofcommunicatingwithasubmarine. 2Whatdoestheunderlinedwordfeasiblemean? A.Achievable. B.Convenient. C.Changeable. D.Alternative. 3WhatdoweknowaboutTARF? A.Itiswidelyusedtofinddownedplanes. B.Itcanworkwellatgreatdepthsunderwater. C.Itisanunderwatermachinethatsendssignals. D.Itcansendreceiveandreadsignalsfromunderwater. 4Whatisthebesttitleforthetext? A.TheReal﹣worldUsesofSonarTechnology B.FullWater﹣to﹣airCommunicationClosertoReality C.ABreakthroughintheApplicationofVideoChat D.TARFBecomingaNewMeansofCommunication
8分Plasticisusedtomakealargenumberofproductsweuseeverydaysuchasdrinkandfoodcontainerstrashbagsandgrocerybagscupsandchildren'stoysandbottlesforeverythingfrommouthwashandshampootoglasscleaneranddishwashingliquid.Andthat'snotevencountingalltheplasticthatgoesintofurnitureappliancescomputersandautomobiles. Astheuseofplastichasincreasedovertheyearsit'sbecomealargepartofAmerica'ssolidwaste﹣growingfromlessthan1percentin1960tomorethan13percentin2017.AsanexampleofhowandwhyplasticwasteisincreasingtheInternationalBottledWaterAssociationreportsthattheUSconsumed9.67billiongallonsofbottledwaterin2017comparedto9.1billiongallonstheyearbefore.TheUnitedStatesistheworld'sleadingconsumerofbottledwater.Agoodfirststepinreducingplasticwasteisswitchingtoareusablewaterbottle. Recyclingplasticreducestheamountofenergyandresources资源neededtocreateplastic.Researchshowsthatabottleofwaterrequiresabout2000timesasmuchenergytoproduceasthesameamountoftapwater.Recyclingplasticproductsalsokeepsthemoutoflandfills垃圾填埋andallowstheplastictobereusedinmakingnewproducts.Recycling1tonofplasticsaves7.4cubicyardsoflandfillspace.Andlet'sfaceitalotofplasticendsupdirectlyintheenvironmentbreakingdownintotinypieces?pollutingoursoilandwater. Today80percentofAmericanshaveeasyaccesstoaplasticrecyclingprogram.Auniversalnumberingsystemforplastictypesmakesiteveneasier.AccordingtotheAmericanPlasticsCouncilmorethan1800USbusinesseshandleplasticwaste.Inadditionover200000grocerystoresnowserveasrecyclingcollectionsitesforplasticwaste. 1Whatmessagedoesthefirstparagraphmainlyintendtoconvey? A.Plasticproductsarequitecommon. B.Plasticiswidelyusedinourdailylife. C.Whatfunctionsplastichas. D.Whyhumansmakeuseofplastic. 2Accordingtoparagraph2. A.plasticwasteisontheriseinAmerica B.Americanspreferbottledwatertotapwater C.plasticwasteistheleadingtypeofwasteinAmerica D.usingreusablewaterbottlesdoesn'thelpreduceplasticwaste 3Whatbenefitdoesrecyclingplasticmainlybring? A.Ithelpscutdownonpollution. B.Ithelpstomakesoilmorerich. C.Itmakesplasticeasilybrokendown. D.Itproducesnewenergyandresources. 4Whatdothefigureslistedinthelastparagraphsuggest? A.Americanssufferalotfromplasticwaste. B.Americansaregoodatrecyclingplastic. C.RecyclingplasticisconvenientintheUS. D.RecyclingplasticbringsgreatprofitsintheUS.
高铁酸钾K2FeO4是一种新型高效多功能水处理剂．K2FeO4为紫色固体微溶于KOH溶液．K2FeO4具有强氧化性在酸性或中性溶液中迅速产生O2在碱性溶液中较稳定．某学习小组设计了下面的实验制备K2FeO2并探究其性质． 一K2FeO4的制备 该小组用如图所示装置制备K2FeO4夹持装置略． 1以上装置图中有一处明显的错误请你帮助指出来．B中应盛装的试剂是． 2写出A中发生反应的离子方程式． 3C中发生的反应有Cl2+2OH﹣＝Cl﹣+ClO﹣+H2O还有生成K2FeO4的反应．写出得到紫色固体K2FeO4的化学方程式． 二性质探究 用KOH溶液充分洗涤C中所得固体得到固体物质K2FeO4． 4絮凝实验甲同学取少量K2FeO4加入浑浊的泥浆水中发现产生气体搅拌浑浊的泥浆水很快澄清．请结合方程式说明K2FeO4的净水原理． 5乙同学取少量K2FeO4向其中滴入稀盐酸发现产生黄绿色气体．产生黄绿色气体的原因可能是． 6丙同学取少量K2FeO4向其中滴入MnSO4和适量H2SO4的混合溶液振荡后溶液呈紫色丙同学认为氧化性FeO42﹣＞MnO4﹣．请你设计一个实验验证丙同学的结论是否正确．
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TheflowersarebloomingandthebirdsaresingingasMelindasitsintherosegardenofthenursinghome.Sheisrecallingoldtimesasshewaitsforherfamily'sarrival.ThenursinghomehasbeenMelinda'snewsettlementeversinceThomaspassedawayaweekago.Thomashadfoughtalongandhardbattleagainstlungcancerforthreeyears.UnfortunatelyhehasbrokenthepromisethatheandMelindahadmadetobewitheachotherforeverybirthday.Melindaknewthiswasunrealistic不现实的butagreedtothepromiseforThomas'ssake. ThomasyouarecompletelyadreamerMelindashoutedtoThomasashedraggedonaboutlivingonanislandwithhisbeautifulwife.That'swhatshelovedabouthimmost﹣hehadavividimagination.Theygotmarriedatageeighteenandbeganhavingchildrenrightaway.MarycamewithintheyearfollowedbyThomasBenjaminIILilly﹣AnnandJosephLittleJoeyGeorge.Thefamilylivedanexultantlifefilledwithlaughterandlove. Mom!Lillyshoutedbutitreallysoundedlikeahowl.Melindahadlostherselfinthinkingaboutthelifeshehadsharedwithherlatehusband.Lillypushedherdownthelongdarkhallsofthenursinghomeuntiltheyarrivedattherecreationalroom. WhenthedoorsopenedMelindaputherhandoverhermouthandwascompletelyspeechless. Theroomwascrowdedwiththepeoplenearestanddearesttoherandthewarmthandlovewasfeltinstantly.Thenightwentonstoriesandcocktailsweresharedandeverythingwasperfect. HoweverwhenMelindacaughtamomenttoherselfshelookedaroundatherfamily.WithasmileonherfacesheraisedherManhattanandcalledoutforatoast.ThisoneisforyouThomasthoughyouarenothere. 1WhydidThomasbreakhispromise? A.Hewasbusywithhiswork. B.Hediedoflungcancer. C.Hehadtoserveinthearmy. D.HestoppedlovingMelinda. 2WhichofthefollowingbestexplainsexultantunderlinedinParagraph2? A.Peaceful. B.Simple. C.Stressful. D.Happy. 3Whatcanweinferfromthelastparagraph? A.Melinda'childrenforgottheirfather. B.Melindawastiredofnoise. C.Melindamissedherhusbandbadly. D.Melindalikedtodrinkalcohol. 4Whatcanbeasuitabletitleforthetext? A.AParticularBirthday B.AWomanataNursingHome C.MemoriesofOldDays D.ABigSurpriseforMelinda
15分Peoplewithcolourblindnesscan'tseecoloursinanormalway.Colourblindness1affectapproximately1in12menand1in200womenintheworld. Therearevariouscausesofcolourblindness.Forthemajorityofcolour﹣blindpeople?theconditionissomethingtheyhavefrom2bearalthoughsomepeoplegetitlaterinlifebecauseofdiseases. Mostcolour﹣blindpeoplecanseethingsasclearlyasotherpeoplebut3areunabletofullyseeredgreenorbluelight.Therearedifferenttypesofcolourblindnessandthereareextremelyrarecases4peopleareunabletoseeanycolouratall.The5commonformofcolourblindnessisred/greencolourblindness.Although6knowasred/greencolourblindnesstheformofcolourblindnessdoesn'tmeansufferers7meremixupredandgreen.Itmeanstheymixupall8colourthathavesomeredorgreenaspartofthewholecolour. Theeffects9colourblindnesscanbemildmoderate中等的orsevere.Approximately40%ofcolour﹣blindpeopleareevenunawarethatthey'recolour﹣blind.Statistically10speakmostpeoplewithamoderateformofred/greencolourblindnesscanonlyidentify5colouredpencilsfromastandardboxof24pencilcrayons.
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作文.文中共有10处语言错误每句中最多有两处.每处错误仅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A并在其下面写出该加的词. 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II处起不计分. Lastweekendlwentfishingwithmycousinsbyariverwherewastwomilesawayfrommyhomebybike.Whenwewereabouttoreturnforhomewefoundoneofourbikelost.Wewerereallynervousthen.Askingaboutthelostbikenobodytoldthetruthexceptme.Andtomysurprisemyparentsdon'tscoldme.Insteadtheysaidlwasahonestboy.Ihavebenefitedgreatfrommyfamilyrules.I'mnotthebestatschoolworkbutclassmatestrustmeandnearlyeveryoneiswillingtomakingfriendswithme.IthelpsmeknowbetteraboutHonestyisthebestpolicy.
Curiousaboutwhatbookswillbepublishedinthemonthsaheadsoyoucanpre﹣orderorreservethem?Pleasenotewehavenotincludedeverybookthatiscomingoutbutrathersomethatcaughtoureyes﹣andthatwethoughtshouldcatchyoursaswell. TheBigBraveAdventurousLifeofLaviniaWarrenbyElizabethRaum LaviniaWarrenneverletherheightpreventherfromleadingafullandadventurouslife.Althoughshenevergrewthreefeettallshebecameabelovedteacheraworldtravelleranentertainerandthefriendofmanypowerfulfigures.Laviniafacedseveraltragedies悲剧butalwaysfoundthestrengthtogoon.Lavinia'sextraordinarystoryalsoprovidesasocialhistoryofoneofthemostdifficultperiodsinAmericanhistory. TheDollhouseMurdersbyBettyRenWright Amyisterrified.Shehearsnoisescomingfromthedollhouseintheattic阁楼andthedollsshewasplayingwitharen'twheresheleftthem.EverynightwhenAmygoesuptocheckonthedollhouse?thedollshavemovedagain!SecretsbecomeclearasAmygetsclosertoshowingthemystery迷ofthedollsinthisnovelthatcombinescomplicatedfamilyrelationshipswithamystery. TheGirlintheLockedRoombyMaryDowningHahn Afamilymovesintoanoldabandonedhouse.Jules'parentslovethehousebutJulesisfrightenedandfeelsasenseofwarning.Whensheseesapalefaceinanupstairswindowthoughshecan'thelpwonderingaboutthepresenceonthetopfloor.ThenJulesisdeterminedtocontactthemysteriousfigureandhelpunlockthedoor.Pastandpresentintersect交叉assheandherghostlyfrienddiscoverthesecretofthefamilywholivedinthehouseallthosemanyyearsago. 1WhatmakesLaviniaWarrenimperfect? A.Herheight. B.Hershape. C.Herstrength. D.Hercharacter. 2WhatcanwelearnfromTheDollhouseMurders? A.Amyisfrightenedwhenhearingnoisesintheattic. B.Amycaresmorefordollsthananythingsheeverhas. C.Amyfindsittoughtosleepwithoutdolls'company. D.Amywillknowlittleaboutherfamilyrelationships. 3WhathappenswhenJulesseesapaleface? A.Shedarenottellherparentsallthatshesees. B.Sheremindsherparentsofthedangeratonce. C.Shemakesuphermindtohelpherfriendout. D.Shewantstoknowwhatexistsonthetopfloor.
已知函数fx＝|x+a|+|x﹣2|． I当a＝﹣3时求不等式fx≥3的解集 II若fx≤|x﹣4|的解集包含[12]求a的取值范围．
AnexcitinglandingprocessofChang'e﹣4lunarprobe月球探测器wasseenthroughthemonitoratBeijingAerospaceControlCenterinBeijingJan.32019.Ittoucheddownonthefarsideofthemoonat1026a.m.BeijingTimebecomingthefirstspacecraftsoft﹣landingonthemoon'sunknownsidenevervisiblefromEarth. China'sChang'e﹣4probehasstartedtheexplorationonthefarsideofthemoonthankstotherelaysatellitethatprovidesacommunicationlinkwithgroundcontrol.TherelaysatellitenamedQueqiaomeaningMagpieBridgeafteraChineselegend传说waslaunchedonMay212018andbecamethefirstcommunicationsatelliteoperatinginthehaloorbitnearly500000kmfromtheearth.Itcanalsoprovidecommunicationforprobesfromothercountries.Therelaysatellitewillalsobeusedforscientificandtechnologicalexperiments.ThemaximumdistancebetweenthesatelliteandtheChang'e﹣4probeonthefarsideofthemoonis79000km.ThesatelliteprocessesdatafromtheprobeandsendsittoEarth. Thesatellitecanstayinitsorbitforalongtimeduetoitsrelativelylowfuelconsumptionastheearth'sandmoon'sgravitybalancesitsorbitalmoving.Whileinorbititcanseeboththeearthandthefarsideofthemoon. TheconceptofusingarelaysatelliteinthehaloorbitwasfirstputforwardbyU.S.spaceexpertsinthe1960sbutwasrealizedbyChinesespaceengineers. Researchershopetousethecamerasonthesatellitetorecordasteroids小行星hittingthefarsideofthemoon.TocontrolthecostoftheChang'e﹣4probetherelaysatellitewasdesignedtoberelativelysmallweighingabout400kg. Researchershadjust30monthstodevelopthesatelliteputtingthemunderhighpressure.TopromotepublicinterestinspaceexplorationtheChinaNationalSpaceAdministrationinvitedpeopletowritedowntheirwishesforlunarandspaceexplorationandtherelaysatellitecarriesthenamesoftensofthousandsofparticipantsandtheirmessages. 1Whatdoweleamfromthesecondparagraph? A.TherelaysatellitewaslaunchedonJan.32019. B.Chang'e﹣4probewasthefirstcommunicationsatellite. C.Therelaysatelliteonlyexploresthefarsideofthemoon. D.TherelaysatellitecanhandledatafromChang'e﹣4probe. 2Whywasthesizeoftherelaysatelliterelativelysmall? A.Toreducethecostasmuchaspossible. B.TomakeitcircleMoonforalongertime. C.Toavoidbeingcrashedbyothersatellites. D.TofollowAmericanspaceexperts'advice. 3WhatmaderesearcherssufFerfromgreatstress? A.Fewpeopleinterestedintheexplorationonthemoon. B.Therelaysatellitecarryingtoomuchequipment. C.Theirlackingenoughtimetodeveloptherelaysatellite. D.People'sneverbeingoptimisticabouttherelaysatellite. 4Whatisthemainideaofthetext? A.ChinaisanewspacepoweraftertheUSA. B.Chang'e﹣4probelandsonMoon'sfarside. C.Chinesespaceengineersmakemuchprogress. D.Spaceexplorationisadangerouschallenge.
30分GreenbergwasaluckyguytoenterColumbiaUniversityonfullscholarship.ButjustbeforejunioryearGreenberg's1changed.Onedayhisvision2upandlaterhewasdiagnosed诊断withglaucoma青光眼.ThendoctorsoperatedonGreenberg'seyes.3thesurgerydidn'twork.Greenbergwasgoingblind.Hewasso4thatherefusedtoseeanyone. AsGreenberg'sbestfriendArthurpersuadedGreenbergtogobacktoColumbiaand5tobehisreader.Arthurread6tohimeverydaytakingtimeoutfromhisownstudyandGreenberg7scoringstraightA's.Stillhewas8aboutgettingaroundaloneandreliedonhisfriend. ThenoneafternoonGreenbergandArthurwenttoMidtownManhattan.WhenitwastimetogobacktocampusArthursaidhecouldn't9himbecauseofanappointment.Greenberg10TheyarguedandArthurwalkedoff11GreenbergaloneinGrandCentralTerminal. Greenbergwhowascompletely12stumbled蹒珊throughtherush﹣hourcrowd.HetookashuttletrainwesttoTimesSquareandthentransferredtoanuptowntrain.Fourmileslaterhe13attheColumbiaUniversitystop. Attheuniversity'sgatessomeone14him.Oopsexcusemesir.Greenberg15thevoice.ItwasArthur's.Greenberg'sfirstreactionwas16butinthenextsecondherealizedwhathehadjust17﹣andrealizedtoowhohadmadeitpossible.18Arthurhadbeenwithhimthewholewayusingoneofthemost19strategies. Blindnessdoesn'tmakeGreenbergfailtoappreciatethe20oflife.Healwayssaysheistheluckiestmanintheworld. 1A.faith B.attitude C.fortune D.reputation 2A.lit B.steamed C.cleared D.cheered 3A.Otherwise B.Moreover C.Therefore D.However 4A.shy B.desperate C.selfish D.nervous 5A.offered B.pretended C.happened D.learned 6A.letters B.newspapers C.textbooks D.magazines 7A.endedup B.carriedon C.imagined D.considered 8A.curious B.confident C.excited D.tentative 9A.abandon B.rescue C.comfort D.accompany 10A.compromised B.panicked C.explained D.apologized 11A.leaving B.finding C.consulting D.serving 12A.tired B.amused C.confused D.satisfied 13A.gotoff B.pulledover C.lookedaround D.ranaway 14A.turnedto B.shoutedat C.knockedinto D.quarreledwith 15A.raised B.lost C.controlled D.recognized 16A.anger B.pleasure C.relief D.sorrow 17A.missed B.questioned C.ignored D.achieved 18A.Gradually B.Finally C.Obviously D.Strangely 19A.brilliant B.familiar C.defensive D.complex 20A.magic B.beauty C.wisdom D.truth
已知三棱锥P﹣ABC的三条侧棱PAPBPC两两互相垂直且PA＝PB＝PC＝a则该三棱锥的外接球的体积为．
点P为双曲线C1和圆C2x2+y2＝a2+b2的一个交点且2∠PF1F2＝∠PF2F1其中F1F2为双曲线C1的两个焦点则双曲线C1的离心率为
Createdin1998byCaseyandShelleyBlacktheNorthernLightsWildlifeWolfCenterfocusesonnotonlyrescuingyoungabandonedwolvesbuteducatingthepublic.Unlikeothercentersyoucanactuallywalkwiththewolvesandhaveexcitinghands﹣oninteractionwiththemhere.Andsowegatheredonelatewintermorningtolearnprepareandwalk. ScrappyandFloraourwolvesthatdaywerebroughttothecenterwhenonlyafewdaysold.Theylivedinthehousewithusforthefirstseveralmonths.WetreatedthemlikehumanbabiesfedthemandsleptwiththemsaidShelley.Sotheyaretotallyusedtopeople.Howeverthesearewildanimals.ForthatreasonShelleyandCaseyexplainedthewalkistotallyonthewolf'sterms.Wedon'tapproachthembutiftheycomeuptouswecantouchthem. Withallthisinmindweheadedforthewoods.WewerewalkingonaloggingroadwhensuddenlyFloraall60poundsofherhurrieduptomeandraiseduponherlegs.Shewasalmostastallasme.Assheleanedinputherhugemuddypawsonmyshouldersandsniffedmyfaceapparentlyshewassayinghelloinwolftalk. WewalkedfarthermaybehalfamilewhileScrappyandFloradashedinandoutofthewoodsstoppingtooccasionallyrollinthesnowdigforthisorthatandjustplay.Thenweallheadedintothetreestoapicturesquestreamwherethewolvessplasheddrankandhadagreattime. Onecouldpointoutthatthiswholeadventurewasstagedandquiteartificial.ButthepurposeCaseyandShelleysaidistoexplainthewolves'placeintheenvironmentandprimarilytoletpeopleknowwolvesdon'thavetobeuniversallyfeared﹣theyreallydon'thidesecretlyinthewoodsjustwaitingtoeatpeoplebutthey'dratheravoidpeopleforthemostpart. 1HowistheNorthernLightsWildlifeWolfCenterdifferentfromothers? A.Ittrainsandeducateswildwolves. B.Itaimstorescueyoungabandonedwolves. C.Itraiseswolvesforcommercialpurposes. D.Itallowsvisitorstotakeawalkwithwolves. 2WhatcanbeinferredfromShelleyandCasey'sexplanationinParagraph2? A.Thewalkcanbepotentiallydangerous. B.Thewolveshavelostalltheirwildness. C.Peopleshouldgetclosetothewolvesactively. D.Thewolvescanreadpeople'smindlikehumanbabies. 3WhydidFlorabehavelikethatwhenshesawtheauthorontheloggingroad? A.Toexpresscuriosity. B.Toshowfriendliness. C.Toattractattention. D.Toseekcompanionship. 4WhydoCaseyandShelleyorganizesuchanadventure? A.Toadvertisethecenter. B.Topublicizewolfhunting. C.Topromoteenvironmentalprotection. D.Toclarifysomeconventionalviewsofwolves.
已知a1＝1an＝nan+1﹣ann∈N*则数列{an}的通项公式为．
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作文.文中共有10处语言错误每句中最多有两处.每处错误仅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其下面写出该加的词. 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. LastmonthourclassorganizedahikingalongtheChaobaiRiverwhichrunthroughHebeiBeijingandTianjin.MuchtomydisappointIfoundtheriverwasseriouspolluted.AtthatmomentIwasdeterminedtodowhatIcouldprotectit.Firstundermyteacher'shelpIusedtheequipmentsfromtheschoollabtotestthequalityoftheriverwater.ButthenIusedthedataIhadcollectedittoanalyzethepollutionofthewater.FinallyIwriteareportonthepollutionoftherivertothelocalgovernment.IalsogaveapresentationinclasswhereIsuggestedthatwemustmakesmallchangestoprotectourwaterresources.
30分WhenCharlesBarkley'smotherpassedawayBarkley'shometowncametothefuneral.Butan1guestalsocame.Hewasn'tabasketballplayerorfromBarkley'shometown.More2hewasmydad﹣ascientist. Mydadsaidhe3aboutBarkleylongbeforehemethim.Wheneverwe4dinnerpartieshewouldtalkaboutBarkley.Basketballhasneverbeenmything.I5somekeywordsintoasearchengineto6somethingaboutBarkley.Heseemedprettyfamousand7notlikeanyonewhowouldbefriendswithmydad. Butthefriendshipwasreal. Mydad8madeaslideofphotosofhimandBarkleytogetherforourcommunity'sChineseNewYearparty﹣totallyirrelevanttothe9.Iaskedhimwhatmadethembecomefriends. AsanAsianintheU.S.wehadagood10hesaid.Weagreeonmanyviews. Theybelievedthecoloroftheirskindidn't11. ButonaSundayafternoonmydadpassedaway.Everyonewas12asBarkleyattended thefuneral.Itgivesmegreat13andjoytoknowIwasafriendofhisBarkleysaid.Justhearingabouthimatthe14whathehadachievedandwhathewastryingtohelpothers 15touchedmeI16hewouldbeknowntomanypeople. Atthefuneralpeople17memoriesofmydad.IrealizethatevenafterhepassedawayIwouldcontinueto18thingsabouthim. ThestoryofhisfriendshipwithBarkleywasnotjusta19withafamousperson﹣itthrewlightonthe20ofthisworld. 1A.frequent B.unexpected C.average D.unwelcome 2A.specifically B.importantly C.carefully D.strictly 3A.cared B.worried C.thought D.knew 4A.held B.organized C.attended D.arranged 5A.read B.forgot C.sent D.typed 6A.findout B.applyfor C.talkabout D.pickup 7A.potentially B.accidentally C.deliberately D.certainly 8A.still B.also C.even D.already 9A.experience B.holiday C.player D.friendship 10A.chance B.conversation C.argument D.choice 11A.bum B.differ C.matter D.shine 12A.astonished B.thrilled C.annoyed D.disappointed 13A.moments B.memories C.relief D.comfort 14A.meeting B.hometown C.party D.funeral 15A.accomplish B.contribute C.develop D.gain 16A.wished B.declared C.suspected D.confirmed 17A.improved B.refreshed C.shared D.lost 18A.spread B.leam C.obtain D.mourn 19A.connection B.coincidence C.phenomenon D.relationship 20A.benefits B.responsibilities C.possibilities D.varieties
25分假定你是李华你的新西兰朋友Terry没有进入学校唱歌比赛的决赛感到非常伤心.请你给他写一封email内容包括 1.表示安慰 2.给予鼓励 3.提出希望. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
设函数fx＝ax2+blnx﹣x已知曲线y＝fx在点1f1处的切线与直线x﹣y+1＝0垂直． 1求a的值 2求函数fx的极值点．
室温时用0.100mol•L﹣1AgNO3溶液滴定50.0mL0.0500mol•L﹣1NaCl溶液的滴定曲如图所示[pCl＝﹣lgCl﹣]．下列有关描述错误的是
在真空中某点固定一个带负电荷的金属小球A可视为点电荷所带电量Q＝1.0×10﹣5C在离它10cm处放置另一个带负电的检验电荷B以下描述正确的是
在△ABC中角ABC所对应的边分别为abc且满足＝•＝3． Ⅰ求△ABC的面积 Ⅱ若b+c＝6求a的值．
物质的结构性质和用途之间有着非常密切的关系．下列有关物质的性质与用途的因果对应关系错误的是
已知等比数列{an}满足an＞0n∈N+且a3•a2n﹣3＝4nn＞1则当n≥1时log2a1+log2a3+…+log2a2n﹣1＝
10分Makingabudgetcanbequiteasatisfyingprocess.Afterdrawingoneup?You'llprobablyfeelproudthatyou'vecontrolledyourfinances.Howeverdrawingupyourbudgetisn'tthemostimportanttaskwhenifcomestomanagingyourmoneysuccessfully.1. Ifyou'reoneofthemanypeopleinBritainwithmorethanonebankaccountusingseveralalongsideoneanothercouldhelpyoustayincontrolofyourspending.2.Thatcanhelpyouavoidoverspendinginasinglearea. 3keepaneyeonyouraccountseachmonth.Whetheryoureceiveyourregularbankstatementsandbillsthroughthepostoronlinemakesureyoucheckthem.Theycantellyouwhereyoumightbeoverdoingitandshouldinspireyoutocutbackimmediatelyifnecessary.Besidesyou'relikelytopickupanyproblemsastheyarise. Makinganoteofallyourspendingforafewweeksisanotherwaytocheckthatyourmoneyreallyisgoingwhereyou'dlikeitto.4butifyoutendtospendusingcashratherthanacreditcardyouwontbeabletotrackwhereyourmoneyisgoingsimplyfromlookingatyourbankstatementsandbills. Asyourpersonalcircumstanceschangeyourbudgetwillneedtobechangedtoo.5.Whileitmayseemlikeachancetoloosenupyourpursestringsslightlyfailingtotakeaccountofanincomeriseinyourbudgetcouldmeanyoudon'ttrulymakethemostofit. A.Ifyouwantyourbudgettostaybalanced B.It'lltakeafewmonthstogetusedtobudgeting C.Itmayseemtiresometowriteeverythingdown D.Divideupyourincomeeachmonthintoseparateaccounts E.Onceyou'velinkedallyouraccountsyoucancreateabudget F.Gettingapromotionorpayriseshouldmeanyouremakeyourbudget G.Thekeytoeffectivebudgetingisstickingtothespendingplanyou'vemade
工业废水中含有的Cr2O72﹣和CrO42﹣会对水体产生很大的危害因此这种工业废水必须净化处理．一种处理含铬废水的工艺流程如下 ①中反应为2CrO42﹣黄色+2H+⇌Cr2O72﹣橙色+H2O． 下列说法正确的是
如图所示带电小球a由绝缘细线PM和PN悬挂而处于静止状态其中PM水平地面上固定一绝缘且内壁光滑的圆弧细管道GH圆心P与a球位置重合管道底端H与水平地面相切一质量为m可视为质点的带电小球b从G端口由静止释放当小球b运动到H端时对管道壁恰好无压力重力加速度为g．在小球b由G滑到H过程中下列说法中正确的是
如图直三棱柱ABC﹣A1B1C1中DE分别是ABBB1的中点． 1证明BC1∥平面A1CD 2设AA1＝AC＝CB＝2AB＝2求三菱锥C﹣A1DE的体积．
ABCDE是元素周期表中原子序数依次增大的前四周期元素．A与B同周期且A元素原子核外s能级有1个未成对电子B元素的原子核外p电子比s电子少1C元素的原子序数比B元素多1D元素的原子价电子有6个未成对电子它的一种化合物常用于检验酒驾E元素的原子价电子有4个未成对电子．请回答下列问题 1第一电离能介于A和B之间的同周期元素有填元素符号． 2B元素的最高价氧化物的水化物在水溶液中能完全电离电离所得阴离子的空间构型为．写出2种与该阴离子互为等电子体的微粒的化学式．画出基态D原子的价电子排布图． 3C元素对应的简单氢化物的沸点明显高于同族其他元素对应的简单氢化物其原因是． 4元素D可以形成的配合物如图1所示． ①该配合物中碳原子的杂化类型为． ②该配合物中所含化学键的类型不包括填字母． a．极性共价键b．非极性共价键c．配位键d．离子键e．金属键f．σ键g．π键 5元素E的单质和氮气在640℃可发生置换反应产物之一的晶胞结构如图2所示该反应的化学方程式为．若该晶体的密度是ρg•cm﹣3则两个最近的E原子间的距离为cm．用NA表示阿伏加德罗常数的值
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