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如图，在直四棱柱ABCD﹣A1B1C1D1中，底面ABCD是矩形，A1D与AD1交于点E，AA1＝AD＝2AB＝4． （1）证明：AE⊥平面ECD． （2）求直线A1C与平面EAC所成角的正弦值...
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高三下学期数学《》真题及答案
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如图四棱柱ABCD-A.1B.1C.1D.1的底面ABCD是正方形O.为底面中心A.1O.⊥平面AB
如图在直四棱柱ABCD－A1B1C1D1中底面ABCD为等腰梯形AB∥CDAB＝4BC＝CD＝2AA
如图四棱柱ABCD－A.1B.1C.1D.1的底面ABCD是正方形O.是底面中心A.1O.⊥底面AB
如图直四棱柱ABCD-A1B1C1D1的底面是边长为1的正方形侧棱长AA1=则异面直线A1B1与BD
如图在直四棱柱A1B1C1D1-ABCD中当底面四边形ABCD满足条件__________时有A1C
如图直四棱柱ABCD－A1B1C1D1底面ABCD为菱形AB＝1AA1=∠ABC＝60°.1求证AC
已知正四棱柱ABCD—A1B1C1D1中AA1=2ABE为AA1中点如图所示则异面直线BE与CD1所
A
B
C
D
如图在四棱柱ABCDA1B1C1D1中侧棱AA1⊥底面ABCDAB∥DCAA1=1AB=3kAD=4
如图15四棱柱ABCDA.1B.1C.1D.1中A.1A.⊥底面ABCD四边形ABCD为梯形AD
在直四棱柱A1C1D1－ABCD中当底面四边形ABCD满足条件____时有A1C⊥B1D1注填上你认
如图四棱柱ABCD－A.1B.1C.1D.1的底面ABCD是正方形O.为底面中心A.1O.⊥底面AB
若正四棱柱ABCD—
1
1
1
1
的底面边长为1，AB
1
与底面ABCD成60°角，则A.
1
C.
1
到底面ABCD的距离为( ) A.B.1 C. D.
如图所示直四棱柱A.′B.′C.′D.′－ABCD侧棱与底面垂直的棱柱称为直棱柱中当底面四边形ABC
在底面是矩形的直四棱柱ABCD-A1B1C1D1中∠DAD1=∠CDC1=45°那么异面直线AD1与
30°
45°
60°
90°
如图直四棱柱ABCD—A1B1C1D1的底面ABCD为平行四边形其中AB=BD=BC=1AA1=2E
如图在直四棱柱ABCD－A1B1C1D1中底面ABCD为等腰梯形AB∥CD且AB＝2CD在棱AB上是
如图在正四棱柱ABCD-A1B1C1D1中底面ABCD的边长为3BD1与底面所成角的大小为则该正四
如图在四棱柱ABCD-PGFE中底面ABCD是直角梯形侧棱垂直于底面AB//DC∠ABC＝45oDC
如图所示在直四棱柱A.1B.1C.1D.1－ABCD中当底面四边形ABCD满足条件________时
如图四棱柱ABCD－A.1B.1C.1D.1的底面ABCD是正方形O.是底面中心A.1O.⊥底面AB
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Tiredofdealingwiththoseslowdumbandunfriendlyhotelstaff?Howaboutahotelthatprovideschanceforminimalinteractionwiththepeoplerunningthehotel?IntheHennNaHotelinJapantherearen'tany! BeingcalledWeirdHotelbylocalstheHennNaHotelopenedin2016inthetownofSaseboisstaffedalmostbyrobots.Therobotsarenotjustforfun.Theydoalargeamountofworksavingtimeandmoneyaswell.Theycangreetyouwhenyouenter.Alsotheyplaymusicintheloungeinformyouofthebreakfastmenuandcontrolthelightsinyourhotelroometc. Thinkingthatthehotelshouldbeuniqueandappealingtheownersmadeeachrobotdifferentfromeachotherwithavarietyofshapesandsizes.OneoftherobotsbehindthefrontdeskisdesignedtolooklikeadinosaurIfyouwanttocheckinpushonethedinosaursays.Thentheguestcantypetheinformationonatouchpanelscreen.Insidetheroomthere'sasmallrobotcalledTulyintheshapeofapinktulip郁金香.TulycananswersimplequestionslikeWhattimeisit?andWhatwilltheweatherbeliketomorrow?WithnoswitchesonthewallTulycanalsoturntheroomlightsonoroffifit'stoldto. Buthowdothingslikecheck﹣inandroomaccesswork?Wellthescreenatthereceptioncapturesandregistersadigitalimageoftheguest'sfaceduringcheck﹣inwhichisusedtogetaccess10roomsinsteadoftraditionalkeys.Howeverthereceptionshallalsoprovideyoucardkeysonrequestincaseyouwishtokeepitsubtle! Ifyou'rewonderingwhathappensinthecaseofanemergencyyouneednotworry.Humansdostepinwhenit'sofgreatimportance.Accordingtothehotel'swebsitethereareafewhumanstaffmemberswhoareavailableon﹣call24X7andhelpguestsinthecaseofanemergency. 1TherobotsintheHennNaHotelcandothefollowingthingsfortheguestsEXCEPT. A.tellthebreakfastmenu B.controlthelightsintheroom C.playmusicinthelounge D.respondtoalltherequirements 2Whatcanwelearnfromthepassage? A.TheHennNaHotelismanagedallbyrobots. B.Adinosaur﹣likerobotwillguidegueststocheckin. C.Nohumanstaffcanbeconnectedeveninanemergency. D.Guestscanhaveaccesstoroomsbyusingtraditionalkeys. 3Itcanbeinferredthattheownersofthehotel. A.entertaintheguestsallthetimeinperson B.areimaginativeandhavecreativethinking C.areknowledgeableandacquireadvancedtechnology D.attachgreatimportancetothesocialimageofthehotel 4What'sthemainideaofthispassage? A.Itadvocatespeopletopromotehotelequipment. B.Itcomparestherobotswithhumanstaffinahotel. C.Itintroducesanewhotelstaffedbyintelligentrobots. D.Itdescribeshowwonderfulartificialintelligenceis.
假如你是李华你最近在某网站购得一部电子书阅读器Kindle却发现商品存在一些质量问题.请你给商品负责人写一封电子邮件进行投诉要点如下 1.购买时间 2.质量问题 3.你的要求. 注意 1词数80左右 2可适当增加细节以使行文连贯.
7.5分DidyouhearwhathappenedtoAdamLastFriday?LindseywhisperstoTori. WithhereyesshiningToribragsYoubetIdidSeantoldmetwodaysago. WhoareLindseyandToritalkingabout?ItjusthappenedtobeyourstrulyAdamFreedman.Icantellyouthatwhattheyaresayingisanotniceandbnoteventrue.StillLindseyandToriaren'tverydifferentfrommoststudentshereatLintonHighSchoolincludingme.Manyofourconversationsaregossip闲话.Ihavenoticedthreeeffectsofgossipitcanhurtpeopleitcangivegossipersastrangekindofsatisfactionanditcancausesocialpressuresinagroup. Animportantnegativeeffectofgossipisthatitcanhurtthepersonbeingtalkedabout.Usuallygossipspreadsinformationaboutatopic﹣breakupstroubleathomeevendroppingout﹣thatapersonwouldratherkeepsecret.Themoreembarrassingorshamefulthesecretisthejuicierthegossipitmakes.Probablytheworsttypeofgossipistheabsolutelie.Peopleoftenthinkofgossipersasharmlessbutcruelliescancausepain. Ifweknowthatgossipcanbeharmfulthenwhydosomanyofusdoit?Theanswerliesinanothereffectofgossipthesatisfactionitgivesus.Sharingthelatestrumor传言canmakeapersonfeelimportantbecauseheorsheknowssomethingthatothersdon't.Similarlyhearingthelatestrumorcanmakeapersonfeellikepartoftheingroup.Inotherwordsgossipissatisfyingbecauseitgivespeopleasenseofbelongingorevensuperiority优越感. Gossipalsocanhaveathirdeffectitstrengthensunwrittenunspokenrulesabouthowpeopleshouldact.ProfessorDavidWilsonexplainsthatgossipisimportantinpolicingbehaviorsinagroup.TranslatedintohighschooltermsthismeansthatifeverybodyyouhangaroundwithislaughingatwhatJohnworeorwhatJanesaidthenyoucanbetthatwearingorsayingsomethingsimilarwillgetyouthesamekindofnegativeattention.Thedo'sanddon'tsconveyedthroughgossipwillnevershowupinanystudenthandbook. Theeffectsofgossipvarydependingonthesituation.Thenexttimeyoufeeltheurgetospreadthelatestnewsthingaboutwhyyouwanttogossipandwhateffectsyourjuicystorymighthave. 1Theauthorusesaconversationatthebeginningofthepassageto. A.introduceatopic B.presentanargument C.describethecharacters D.clarifyhiswritingpurpose 2Animportantnegativeeffectofgossipisthatit. A.breaksuprelationships B.embarrassesthelistener C.spreadsinformationaround D.causesunpleasantexperiences 3Intheauthor'sopinionmanypeopleliketogossipbecauseit. A.givesthemafeelingofpleasure B.helpsthemtomakemorefriends C.makesthembetterattellingstories D.enablesthemtomeetimportantpeople
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Twothingschangedmylifemymotherandawhiteplasticbikebasket.Ihavethoughtlongandhardaboutitandit'strue.Iwouldbeadifferentpersonifmymomhadn'tturnedasillybicycleaccessoryintoalifelessonIcarrywithmetoday. Mymotherandfatherwereunitedintheirwayofraisingchildrenbutitmostlyfelltomymothertoactuallycarryitout.LookingbackIhonestlydon'tknowhowshedidit.Managingthefamilybudgetmusthavebeenaveryhardtaskbutshemadeitlookeffortless.Ifwecomplainedaboutnothavingwhatanotherkiddidwe'dhearsomethinglikeIdon'tcarewhatso﹣and﹣sogotforhisbirthdayyouarenotgettingaTVinyourroom/acarforyourbirthday/alavishsweet﹣16party.Wehadtoearnourallowance零用钱bydoingchoresaroundthehouse.Icanstillrememberhowlongittooktopolishthelegsofourcoffeetable.Mybrotherscannodoubtrememberhoursspentcleaningthehouse.LikethetwolittlegirlsgrowingupattheWhiteHousewemadeourownbedsnooneleftthehouseuntilthatwasdoneandpickedupafterourselves.Wehadtokeeptrackofourbelongingsandifsomethingwaslostitwasnotreplaced. Itwassummerandonedaymymotherdrovemetothebikeshoptogetatirefixed﹣andthereitwasinthewindow.WhiteshinyplasticanddecoratedwithflowersthebasketwinkedatmeandIknew﹣Iknew﹣Ihadtohaveit. It'sbeautifulmymothersaidwhenIpointeditouttoherWhataneatbasket. ItriedtoholdoffatfirstIplayeditcoolforashortwhile.ButthenIguessIcouldn'tstanditanylongerMompleasecanIpleasepleasegetit?I'lldoextrachoresforaslongasyousay.I'lldoanythingbutIneedthatbasketIlovethatbasket.PleaseMom.Please? Iwasdesperate. YouknowshesaidgentlyrubbingmybackwhilewebothstaredatwhatIbelievedwasthecoolestthingeverIfyousaveupyoucouldbuythisyourself. BythetimeImakeenoughit'llbegone! MaybeRogerherecouldholditforyoushesmiledatRogerthebikeguy. Hecan'tholditforthatlongMom.Someoneelsewillbuyit.PleaseMomPlease? Theremightbeanotherwayshesaid. Andsoourpayingplanunfolded.MymotherboughtthebeautifulbasketandputitsafelyinsomehidingplaceIcouldn'tfind.EachweekIeagerlycountedmygrowingsavingsincreasedbyextraworkhereandtherewashingthecarhelpingmymothermakedinnerdeliveringorcollectingthingsonmybikethatalreadylookednakedwithoutthebasketinfront.AndthenweekslaterIcountedre﹣countedandjumpedforjoy.Ohhappyday!Imadeit!Ifinallyhadtheexactamountwe'dagreedupon…. Dayslatertheunthinkablehappened.AneighborhoodgirlI'dplayedwithmillionsoftimesappearedwiththeexactsamebasketfixedtohershinynewbikethatalreadyhadallthebellsandwhistles.Irodehardandfasthometotellmymotheraboutthisdisaster.Thishorribleturnofevents. AndthencamethelessonI'vetakenwithmethroughmylifeHoneyYourbasketisextra﹣specialMomsaidgentlywipingawaymyhottears.Yourbasketisspecialbecauseyoupaidforityourself. 1Whatcanwelearnfromthefirsttwoparagraphs? A.Thechildrenenjoyeddoinghousework. B.Theauthorcamefromawell﹣offfamily. C.Themotherraisedherchildreninanunusualway. D.ThechildrenwerefondoftheUSpresident'sdaughters. 2Whentheauthorsawthebasketinthewindowshe. A.fellinlovewithit B.staredathermother C.recognizeditatonce D.wentuptothebikeguy 3Whydidtheauthorsaymanypleasestohermother? A.Shelongedtodoextrawork. B.Shewaseagertohavethebasket. C.Shefelttiredafterstandingtoolong. D.Shewantedtobepolitetohermother. 4ByusingnakedParagraph12theauthorseemstostressthatthebasketwas. A.somethingshecouldafford B.somethingimportanttoher C.somethingimpossibletoget D.somethingshecoulddowithout
7.5分TheUnitedStates'jobmarkethasmillionsofunfilledjobs.ManyofthoseJobsrequiretechnicalskills.Howeveremployerssaymanyofthosejobsarevacantbecausetheycannotfindpeoplewiththerightskills.Laborexpertscallthisparadoxtheskillsgap.Anumberofeffortshavebeenlaunchedtobetterunderstandandsolveit. NicholasWymanwroteabookcalledJobUHowtoFindWealthandSuccessbyDevelopingtheSkillsCompaniesActuallyNeed.Hecallstheskillsgapalabormarketmismatch﹣peoplewithoutjobsandjobswithoutpeople. IntheUnitedStatesthecostofatraditionalfour﹣yearcollegecanbeveryhigh.U.S.collegesanduniversitiesproducemanygraduateseveryyear.Yetunemploymentratesamongnewgraduatesarehigh. NicholasWymansaysacombinationoftechnicalclassesandon﹣the﹣jobtraining﹣﹣﹣anapprenticeship学徒﹣﹣﹣wouldbeabetterchoiceformanypeople.HenotesthatAnapprenticeshipiswhereyoulearnfromaspecialistyouareprovidedguidanceandyoulearninanon﹣the﹣jobenvironment.Itisvitaltogettechnicalskillsthatareofimmediatevaluetoanemployer.Anditisimportanttogettransferableskillsbecausetechnologyandthenatureoftheworkplacearechangingatafasterratethanbefore. Therearequestionsaboutthedefinitionsizeandnatureoftheskillsgapinthelaborforce.IowaStateUniversityresearchersstudiedsomeofthesequestionsrecently.Theyexaminedemploymenteducationandpopulationinformationandfoundtheevidenceofaskillsgapisweak. IowaState'sLieslEathingtonnotedthatmanypolicymakersandemployerssaythereisopportunityinmiddleskillsareaslikemachining.Yetshesaidthemostrecentrecession经济衰退hitsomeofthosejobareashard.Shesaidstudentsshouldbeonguardbecauseoureconomyreallyisn'taddingthatmanyjobsthatrequirethemiddleskills. Shesaidemployerscouldgetmorewell﹣qualifiedapplicantsiftheyofferedhigherwages.Shenotedthatgraduatesoftwo﹣yeartrainingprogramsstillgenerallymakelessmoneythangraduatesoffour﹣yearcolleges. Thequestionoffindingtherightpersonfortherightjobremainsadifficultone.TheDepartmentofLaborsays＝8.7millionAmericansareunemployedandanother6.7millioncanfindonlypart﹣timework. 1Theunderlinedwordparadoxinparagraph1refersto. A.thelargenumberofunemployednewgraduates B.thedemandsemployersmakeonemployees C.peoplewithoutjobsandjobswithoutpeople D.peopledisqualifiedforthevacantpositions 2WhatwillNicholasWymanprobablyadvisenewgraduatestodotogetemployed? A.Toreceivetechnicaltraining. B.Todropthecostlycollegeeducation. C.Tovaluethejobopportunities. D.Toarmthemselveswithvariousskills 3AccordingtoLieslEathingtonwhatisthesolutiontotheskillsgap? A.Reformingthedullnessofeconomy. B.Guardingagainstrecessions. C.Updatingworkers'professionalskills. D.Raisingemployees'earnings.
IgrewupinasmalltowninOhiowhereeveryoneknewamancalledBob.Uneducatedhecouldn'ttalkplainly.Andbecausehewas1andnotverysmarteveryoneteasedhim.I2hewasaneasymark. Onedayhecamewalkingby.Iwasabout12andthoughtitwouldmakemefeelgrown﹣upto3himliketheadultsdid. HeaskedhowIwasdoing.Itoldhimmyfatherwas4andthatwelackedmoney.Icouldhearmyfriends5inthebackgroundsoIwentonwiththelie.Ihadhim6socompletelythateverytimeheinquiredaboutthe7.Iwouldmakeitseemincreasinglyworrying. Iknewhemadea8bydoingoddjobs打零工soitseemed9whenheaskedmeifweneededanything.Itoldhimthatwedidn'tknowifwewould10.HerespondedYoupoorthing.Iwill11foryou. ThatnightIheardthe12rattle作响softly.ThinkingitwasthewindbeatingagainstitI13it.LaterwhenIopenedthedoortogooutsideIfoundaboxof14Iknewwhohadgiventhefood.I15thesmallboxofcannedfoodwithtearsinmyeyes.Ifelt16andwantedtoreturnthegroceries. Myfatherwouldnotletmetakethebox17.HesaiditwouldhurtBob.EachdaywhenweweretohavedinnermyfatherwouldaskWhatsidedisharewehavingfromthe18boxtoday? Itwas19formetoeatthefood.IknewBobhadgiven20.HegavethebesthehadbutIdidnotdeservethegift. 1A.ill﹣treated B.bad﹣tempered C.good﹣natured D.warm﹣hearted 2A.guessed B.predicted C.insisted D.hoped 3A.condemn B.tease C.annoy D.abuse 4A.delayed B.prohibited C.deserted D.unemployed 5A.laughing B.whispering C.cheering D.clapping 6A.absorbed B.amused C.struck D.fooled 7A.atmosphere B.situation C.money D.reason 8A.budget B.profit C.living D.fortune 9A.funny B.impossible C.practical D.moving 10A.panic B.remain C.starve D.compromise 11A.manage B.operate C.purchase D.pray 12A.window B.door C.fence D.box 13A.explored B.fastened C.ignored D.investigated 14A.groceries B.vegetables C.snacks D.fruits 15A.heldup B.lookedthrough C.checkedout D.tookover 16A.thrilled B.touched C.frustrated D.ashamed 17A.back B.away C.out D.apart 18A.money B.check C.ice D.gift 19A.horrible B.hard C.pleasant D.precious 20A.personally B.secretly C.sacrificially D.enthusiastically
DuringthewarmyhusbandwasstationedatanarmycampinadesertinCalifornia.Iwenttolivethereinordertobe1him.Ihatedtheplace.Ihadnever2beensounhappy.Myhusbandwasorderedoutonalong﹣termdutyandIwasleftinatinyshack棚屋alone.Theheatwas3﹣almost125°Fevenintheshadeofacactus仙人掌.4asoultotalkto.Thewindblewnon﹣stopandallthefoodIateandtheveryairIbreathedwere5withsandsandsand! IwassosorryformyselfthatIwrotetomyparents.ItoldthemIwas6andcomingbackhome.IsaidIcouldn'tstanditoneminutelonger.I7beinprison!Myfatheransweredmy8withjusttwolines﹣twolinesthatwillalwayssinginmy9﹣twolinesthatcompletelychangedmylife Twomenlookedoutfromprisonbars Onesawthemudtheothersawthestars. Ireadthosetwolines10.Iwasashamedofmyself.ImadeupmymindIwouldfindoutwhatwasgoodinmypresent11Iwouldlookforthestars. Imadefriendswiththenativesandtheir12amazedme.Theygavemepresentsoftheirfavoriteartworkswhichtheyhad13toselltotourists.Istudiedthedelightfulformsofthecactus.Iwatchedforthedesertsunsetsand14forseashellsthathadbeenlefttheremillionsofyearsagowhenthedeserthadbeenanocean15. Whatbroughtaboutthis16changeinme?Thedeserthadn'tchanged17Ihad.Ihadchangedmy18.AndbydoingsoIchangedanunhappyexperienceintothemostamazing19ofmylife.IwasexcitedbythisnewworldthatIhaddiscovered.Ihadlookedoutofmyself﹣createdprisonand20thestars. 1A.off B.behind C.near D.beyond 2A.before B.already C.then D.still 3A.inflexible B.incomprehensible C.uncontrollable D.unbearable 4A.Only B.Not C.Many D.Such 5A.covered B.filled C.buried D.charged 6A.catchingup B.keepingup C.givingup D.gettingup 7A.oughtto B.mightwell C.wouldrather D.hadbetter 8A.request B.call C.question D.letter 9A.comparison B.imagination C.consideration D.memory 10A.overandover B.byandby C.upanddown D.nowandthen 11A.company B.occupation C.situation D.relationship 12A.movement B.reaction C.guidance D.purpose 13A.refused B.failed C.managed D.happened 14A.asked B.hunted C.waited D.headed 15A.floor B.surface C.rock D.level 16A.shocking B.challenging C.puzzling D.astonishing 17A.as B.but C.for D.or 18A.attitude B.principle C.identity D.standard 19A.vacation B.operation C.affair D.adventure 20A.sought B.counted C.found D.reached
物质W是一种含氮有机物会污染土壤．W在培养基中达到一定量时培养基表现为不透明．某研究小组欲从土壤中筛选出能降解W的细菌目标菌．回答下列问题． 1要从土壤中分离目标菌所用选择培养基中的氮源应该是． 2在从土壤中分离目标菌的过程中发现培养基上甲乙两种细菌都能生长并形成菌落如图所示．如果要得到目标菌应该选择菌落进一步纯化．选择的依据是． 3土壤中的某些微生物可以利用空气中的氮气作为氮源若要设计实验进一步确定甲乙菌能否利用空气中的氮气作为氮源请简要写出实验思路预期结果和结论即． 4该小组将人工合成的一段DNA转入大肠杆菌使大肠杆菌产生能降解W的酶酶E．为了比较酶E与天然酶降解W能力的差异该小组拟进行如下实验请完善相关内容． ①在含有一定浓度W的固体培养基上A处滴加含有酶E的缓冲液B处滴加含有相同浓度天然酶的缓冲液C处滴加三处滴加量相同． ②一段时间后测量透明圈的直径．若C处没有出现透明圈说明若AB处形成的透明圈直径大小相近说明．
7.5分ThepictureofGeorgeWashingtonisontheone﹣dollarbill.HeservedasAmerican'sfirstpresidentfrom1789to1797.PresidentWashingtonhasbeencalledtheFatherofhiscountry. ThethirdpresidentoftheUnitedStatesThomasJeffersonisonthetwo﹣dollarbill.HewasthemainwriteroftheDeclarationofindependencein1776.Jeffersonwasoneofthemostinfluentialofthenation'sFoundingFathers.Hewasalsoaplantexpertarchitectmusicianandinventor. AnotherofAmerican'sgreatestpresidentsAbrahamLincolnisonthefive﹣dollarbill.Heservedasthesixteenthpresidentfrom1861until1865.HesuccessfullyledthecountrythroughtheCivilWarsavedtheUnionandendedslavery. ThepictureofAlexanderHamiltonappearsontheten﹣dollarbill.Hamiltonwasneverpresident.ButhewasthefirstSecretaryoftheTreasuryandoneoftheFoundingFathers.Hewasalsoaneconomistandpoliticalphilosopher. AndrewJacksonwastheseventhpresidentservingfrom1829to1837.Hesupportedpopulardemocracyandindividualliberty.Hispictureisonthetwenty﹣dollarbill. Anotherpresidentisonthefifty﹣dollarbill.UlyssesS.Grantservedfrom1869to1877.BeforeservingaspresidentGrantwasmilitarycommanderofUnionforcesduringtheCivilWar.UnderhiscommandtheUnionArmydefeatedConfederateforces. Sowhodoyouthinkisontheonehundred﹣dollarbill?ItisBenjaminFranklin.FranklinwasneverelectedpresidentbutwasoneoftheFoundingFathers.Hewasalsoaleadingwriterandprinterpoliticalthinkerpoliticianpostmasterscientistinventorcivilactivistanddiplomat. TheseAmericanstatesmenareonthefrontofthebills.Thebacksofthenotesshowimagesfromnation'shistoryorfamousplaces.TheyareinordertheGreatSealoftheUnitedStatesthesigningofDeclarationofIndependenceandtheLincolnMemorial.TheothersaretheTreasuryBuildingtheWhiteHousetheCapitolBuildingandindependenceHall. 1ThedesignofthebillsshowsthatAmericansvaluestheirpeople's. A.talentsinmanyways B.successintheircareers C.inventionsinnewfields D.contributionstothecountry 2Forhundredsofyearsthosehistoricmenonthebillsfoughtforthenation's. A.economyandpower B.independenceanddemocracy C.wealthandsuccess D.faithandglory 3Whichofthefollowingmightbethebesttitleforthetext? A.MenontheMoney B.theDesignofUSBills C.HistoryontheMoney D.theStoryofUSBills
GrowingupinKenyawasamazingbecauseIlearnedsomuchthoughthepovertyandlackofresourcesweresometimesfrustrating.IknewIdidn'thavemuchbutIwas1. TherewasonlyonethingIwasn'thappywith2.Iwantedtogotohighschoolanduniversity.Ihadthedrivethewillandthegrades3Ididn'thavetheresources.Even4thingslikefoodwaterandshelterweren'treadilyavailable.Youngpeopleinpovertyhavelittleorno5tohighschoolsanduniversities.WhereIliveditwaschallenging6someonehelped.WhenIleftprimaryschoolIwasinthesame7asmanyotherpoordisadvantagedyouth.8duringthatyearacharitablehighschoolforgirlsStareheGirlsCentrewas9andIreceivedascholarship.TodayIam10recordasbeingthefirststudenttobeenrolledinthisschool. In2006myschool11TheGlobalGiveBackCircleanot﹣for﹣profitorganizationfor12disadvantagedgirlstocompletetheireducationandgain13skills.AftergraduatingfromhighschoolIwasgivenaccesstoanine﹣monthITcourse.14itsgive﹣backattitudehadtaughtustonotonlycareaboutourselvesbutotherpeople.Withthisinmind10ofuscreatedawebsitecalledHeySisterGetClued﹣Up.Throughthiseducationalwebsiteaimedatnetworking10000African15worldwideallSisterscommittosendinginformationtotheirvillages.Thiscanbeto16financialfreedomadvanceinformation17tohealthissuesandprovideknowledgeaboutsocialnetworkingbehavior. HeySisterGetClued﹣Upisonly18tothosegirlswhocanaccesstheInternetwhichhighlightsthehugechallengein19thedividebetweenthehavesandhave﹣nots.Butourplanisthatthesegirlswill20whattheylearntoothergirlsthroughthepoweroftheirvoice. 1A.energetic B.happy C.confident D.hopeful 2A.status B.college C.entertainment D.education 3A.so B.and C.but D.since 4A.cheap B.basic C.important D.simple 5A.access B.means C.chance D.dream 6A.so B.when C.as D.unless 7A.occasion B.situation C.dilemma D.position 8A.Generally B.Importantly C.Luckily D.Casually 9A.putup B.takenup C.madeup D.setup 10A.on B.in C.at D.for 11A.approved B.took C.joined D.launched 12A.psychologically B.physically C.educationally D.financially 13A.social B.average C.typical D.professional 14A.Inshort B.Inall C.Inaddition D.Inbrief 15A.students B.girls C.kids D.teenagers 16A.promote B.introduce C.employ D.present 17A.attached B.compared C.related D.devoted 18A.alternative B.acceptable C.appropriate D.available 19A.narrowing B.shortening C.declining D.changing 20A.encourage B.spread C.add D.apply
IfeelthatIwasblessedbyanAngelnotlongago.Weliveinasmalltownwherelifeispeaceful.AfewdaysbeforeChristmasIwasoutintownshoppingwithmyhusband.Becauseofthecoldmyfingershrankcausingmyanniversaryringtofalloff.Ididn'tnoticethisuntilwegothome.Ibecamephysicallyill.Ithoughtmyhusbandwasgoingtohaveaheartattack. Yesitisamaterialitembutitisalsoaverysentimental情感的item.Hewentoutandretracedoursteps.Icalledthestoreswewereinandnooneturneditin.Ithoughtitwasgoneforsure.Wellataroundmidnightlastnightourdogsbecamecrazybarkingnervously.Wehaveasunroomthatisattachedtoourhome.Thedoortothatisusuallylocked.Apparentlyweleftitunlocked. Mymotorbikewasparkedoutthere.Initsbasketwasaringbox…holdingmyring!Alongwiththeringwasaband.Itwasahalfsizesmallerthanmyring. Therewasalsoanotethattoldthestoryofthisstrangerfindingtheringandrecognizingtheworkasitwasacustompiece.Thepersonthenwenttothejewelerandexplainedaboutfindingthering. Thejewelerwasafriendofminesoshegavehermynameandasthetownwassosmallwewereeasytofind.Thestrangerwhofoundtheringpurchasedthebandinordertokeeptheringinplacewhenitwascoldout.AndshealsoleftagiftcardforustotakeourfamilyouttothemoviesasaChristmasgift.ThenotewassignedSanta.Myfriendiskeepingherlipssealedaboutwhomitwas. 1Whatdidtheauthordowhenshefoundherringlost? A.Sheblamedherhusbandforlosingit. B.Shetelephonedtheshopstheyhadbeenin. C.Shewasphysicallyillduetotheheartattack. D.Shewentbackalongthesamewaytosearchforit. 2Howdidtheauthorgetthelostringback? A.Thedogdiscovereditinthestore. B.Herfriendfounditinthesunroom. C.Ajewelerpurchaseditfromsomeone. D.Astrangersentitbackwithoutbeingnoticed. 3Whichofthefollowingwordscanbestdescribethestranger? A.Intelligentanddiligent. B.Ambitiousandgenerous. C.Courageousandenergetic. D.Selflessandconsiderate.
OnewinternineyearsagoIvolunteeredatahomelessshelterinLosAngeles1mealsforpeople.ThereImetAlbertwhosaidhelikedmy2.Wanttoseemine?heaskedliftinghis3.Hewasbarefoot.Hesaidhehadbeenhopingtogetapairbuthadnevermadeit.Ifelta4feelinginmystomach. Thenextday5Iwenttobuysocks﹣﹣﹣about﹩1006.Thatnextmorning7myalarmfor5a.m.anddrovetothelocalparkacommondestinationfor8people. Itwasstill9out.Itookoutabagofsocksand10agroupofmenstandingaroundatree11withcold.WhenIhandedeachofthemapairofsockstheylookedconfusedatfirst12mymotives动机buttookthem. AnhourlaterI13allthesocks.Mostpeopleweresleeping.IfeltlikeSanta.Whentheywould14theywouldfindaverymeaningful15. EveryweekI'llhandoutmanysocks.IfI'mawayfor16aweekIwillbringsockswithmeandhandthemouttothehomelessinotherstatesandcountries. Inthepastyearsthishasbecomemy17.It'saddictiveIsupposeandit'sincrediblysatisfyingtohelpmakesomepeople's18alittlebiteasier.PartofmehopestoseeAlbertouttherebut19Idon'tI'dliketothinkoneofthepairswill20him. 1A.preparing B.giving C.donating D.buying 2A.car B.meals C.socks D.help 3A.leg B.arm C.hand D.head 4A.magical B.sinking C.comforting D.surprising 5A.finally B.inaddition C.however D.afterwork 6A.money B.worth C.value D.worthy 7A.made B.placed C.set D.fixed 8A.merciless B.sleepless C.jobless D.homeless 9A.dark B.rainy C.quiet D.windy 10A.signaledto B.shoutedat C.headedfor D.wavedat 11A.trembling B.smiling C.jumping D.sleeping 12A.proving B.inquiring C.demanding D.questioning 13A.tookoff B.tookout C.gaveoff D.gaveout 14A.situp B.wakeup C.riseup D.setup 15A.meat B.present C.act D.kindness 16A.lessthan B.otherthan C.morethan D.ratherthan 17A.habit B.task C.past﹣time D.entertainment 18A.winter B.lives C.families D.difficulties 19A.unless B.until C.evenif D.asif 20A.suit B.fit C.match D.find
回答下列与种群数量有关的问题． 1将某种单细胞菌接种到装有10mL液体培养基培养基M的试管中培养并定时取样进行计数．计数后发现试管中该种菌的总数达到a时种群数量不再增加．由此可知该种群增长曲线为型且种群数量为时种群增长最快． 2若将该种菌接种在5mL培养基M中培养条件同上则与上述实验结果相比该种菌的环境容纳量K值填“增大”“不变”或“减小”．若在5mL培养基M中接种该菌的量增加一倍则与增加前相比K值填“增大”“不变”或“减小”原因是．
回答下列与细菌培养相关的问题． 1在细菌培养时培养基中能同时提供碳源氮源的成分是填“蛋白胨”“葡萄糖”或“NaNO3”．通常制备培养基时要根据所培养细菌的不同来调节培养基的pH其原因是．硝化细菌在没有碳源的培养基上填“能够”或“不能”生长原因是． 2用平板培养细菌时一般需要将平板填“倒置”或“正置”． 3单个细菌在平板上会形成菌落研究人员通常可根据菌落的形状大小颜色等特征来初步区分不同种的微生物原因是． 4有些使用后的培养基在丢弃前需要经过处理这种处理可以杀死丢弃物中所有的微生物．
假定你是李华你们班级的节目哈姆雷特Hamlet将参加下个月学校英语文化节话剧drama比赛你给度假中的外教Mr.Hurst写一封电子邮件并附上节目录像请他给予你相关的指导. 注意 1词数100左右 2可适当增加细节以使行文连贯 3邮件的开头和结尾已为你写好. DearMr.Hurst Yours LiHua.
In1984IapassionatestudentwasheadingfortheuniversitywiththedreamofsittingonaSupremeCountbenchsomewhere.Twenty﹣oneyearslaterIamsillapassionate1andonewithquiteadifferenttaletotell. Mygrandmaan2womangraduatedfromcollegeattheageof65.Shewasthefirstinourfamilytoreachthatgoal.ButoneyearafterIstartedcollegeshe3cancer.Imadethechoiceto4fromcollegetocareforher.Itmeantthatschoolandmypersonaldreamwouldhaveto5. ThenIgotmarriedwithanother6buildingmyfamilywithacombinationofadoptedand7children.In1999weadoptedourfirstson.Ayearlatercameoursecondadoptedboy.Then8sonNo.3.In2003Igavebirthtoanotherboy. Youcanimaginehow9occupiedIbecameraisingfourboysonmyown.Ourhomewasacompletezoo﹣﹣﹣joyouszoo.NotsurprisingIneverdid10itbacktocollegefull﹣time.11Inevergaveuponthedreameither.Ihadonlyonechoicetofindaway.Thatmeant12asfewasoneclasseachsemester. Thehardestpartwasfeeling13aboutthetimeIspentawayfromtheboys.Theyoftenwantedmetostayhomewiththem.There14weretimeswhenIwantedtoquitbutIknewIshouldsetan15forthemtofollowthroughtherestofheirlives. In2006IgraduatedfromtheUniversityofNorthCarolina.Ittookmeover21yearstogetmy16degree! Iamnotspecialjustsingle﹣minded.Italways17methatwhenyou'relookingatabigchallengefromthe18itlookshugebutwhenyou'reinthemidstofititjustseemsnormal.Everythingyouwantwon'tarriveinyourlifeononeday.It'sa19.Rememberlittlesteps20bigdreams. 1A.dreamer B.graduate C.mother D.lawyer 2A.humorous B.attractive C.intelligent D.amazing 3A.delivered B.possessed C.developed D.produced 4A.withdraw B.escape C.drop D.free 5A.cancel B.reach C.wait D.start 6A.ambition B.deal C.dream D.conclusion 7A.ecological B.psychological C.physical D.biological 8A.accompanied B.followed C.involved D.engaged 9A.fully B.mostly C.hardly D.busily 10A.return B.give C.make D.get 11A.Or B.So C.Though D.But 12A.changing B.taking C.shifting D.setting 13A.concerned B.guilty C.determined D.angry 14A.withcertainty B.bycoincidence C.atrandom D.incase 15A.goal B.motivation C.example D.image 16A.graduate B.doctor C.master D.bachelor 17A.dawns B.strikes C.occurs D.sticks 18A.upside B.middle C.outside D.inside 19A.process B.life C.choice D.destiny 20A.turnto B.addto C.buildup D.addupto
IwashavingagreatmorninguntilIsatdowninfrontofmyofficecomputer.Yourpasswordhasexpired过期aservermessageflashedonmyscreenwithinstructionsforchangingit. Comingupwithanewcodedoesn'tseemlikeabigdealunlessyouworkatmycompanywherewehavetochangeitmonthlyusingatleastoneuppercasecharacteronelowercasecharacteronesymbolandonenumeral.Ohandthewholedarnthingcan'tbefewerthaneightcharacters.AndIcan'tuseanyofthesamepasswordsI'veusedinthepastthreemonths. SuddenlyIwasfurious.Whatdidn'tmakeitanybetterwasthatIwasdeeplydepressedaftermyrecentdivorce.DisbeliefoverwhatshehaddonetomewasallIthoughtabout.Everyday. Myangerdidn'tmeananythingtotheemptyinputfieldwithapulsatingcursor闪动的光标waitingformetotypeapasswordthatI'dhavetore﹣enter﹣manytimes﹣forthenext30days.IrememberedatipI'dheardfrommyformerboss.He'dsaidI'mgoingtouseapasswordtochangemylife. Icouldn'tfocusongettingthingsdoneinmycurrentmood.TherewereclearindicatorsofwhatIneededtodotoregaincontrolofmylifebutIcouldn'tnoticethem. Mypasswordbecametheindicator.MypasswordremindedmethatIshouldn'tletmyselfbeavictimofmyrecentbreakupandthatIwasstrongenoughtodosomethingaboutit. ImademypasswordForgive@h3r. Ihadtotypethisstatementseveraltimesaday.Eachtimemycomputerwouldlock.Eachtimemyscreensaverwithherphotowouldappear.EachtimeIwouldcomebackfromeatinglunchalone.InmymindIwroteForgivehereveryday. ThesimpleactionchangedthewayIlookedatmyex﹣wife.Thatconstantreminderofreconciliationledmetoacceptthewaythingshadhappenedattheendofmymarriageandembraceanewwayofdealingwithmydepression.AsthemonthworeonIfeltaslowhealingbegintotakeplace.BythetimemyserverpromptedmetoresetmypasswordthefollowingmonthIfeltfree. OnemonthlatermydearExchangeserveraskedmeyetagaintoresetmypassword.IthoughtaboutthenextthingthatIhadtogetdone. MypasswordbecameQuit@smoking4ever. Iquitsmokingovernight.ThispasswordwasapainfulonetotypeduringthatmonthbutdoingithelpedmetoyellatmyselfinmymindasItypedthatstatement.Itmotivatedmetofollowmymonthlygoal. OnemonthlatermypasswordbecameSave4trip@thailand. GuesswhereIwentthreemonthslaterThailand. Seeinghowtheseremindershelpedtomaterializemygoalskeptmemotivatedandexcited.Whileit'ssometimesdifficulttocomeupwithyournextgoalkeepingatitbringsgreatresults. Hereisasimplifiedextractofwhatsomeofmypasswordshavebeeninthepasttwoyearssoyougetanideaofhowmylifehaschangedthankstothismethod Forgive@h3rTomyex﹣wifewhostarteditall. Quit@smoking4everItworked. Save4trip@thailandItworked. Eat2times@dayItneverworkedstillfat. Sleep@before12Itworked. Ask@her4dateItworked.Ifellinloveagain. No@drinking2monthsItworked.Ifeelbetter. Get@c4t!Itworked.Ihaveabeautifulcat. MovE@togeth3rItworked. Facetime2mom@sundayItworked.ItalkwithMomeveryweek. AndtheoneforlastmonthSave4@ringYep.Lifeisgonnachangeagainsoon. 1Theunderlinedwordfuriousinthethirdparagraphisclosestinthemeaningto. A.depressed B.doubtful C.nervous D.angry 2WhydidhedecidetouseForgive@h3rashispassword? A.Becausehedecidedtoforgivehiswife. B.Becausehehopedhiswifewouldforgivehim. C.Becausehehopeditwouldremindhimtobestrong. D.Becausehisformerbosstoldhimtouseittochangehislife. 3WhatcanwelearnfromthepasswordSave4@ringforlastmonth? A.Hewillcallhismothereveryweek. B.Hewillsoonaskhisgirlfriendtomarryhim. C.Hispasswordwillhelphimsavemoney. D.Hewillberemindedtosavehispassword. 4Whatmightbethebesttitleforthepassage? A.HowaPasswordChangedMyLife. B.WhyIChangedMyPassword. C.HowaSlowHealingTookPlace. D.HowIFollowedMyMonthlyGoal.
AshleyC.FordaNewYorkCitywriterrecentlyappealedtoher66000Twitterfollowers.Acoolthingyoucandotodayistotrytofindoutwhichofyourlocalschoolshavekidswithoverdue过期未付的lunchaccountsandpaythemoff. Childrenfromthepoorestfamiliesgetfreeorreduced﹣pricebreakfastandlunch.Butsomestruggletopayevenreducedprices.SomeoftheIOUs借据comefromkidswhosimplyforgettheirlunchmoneyorparentswhocanaffordtopaybutneglecttokeepprepaidaccountsuptodate. PeoplearoundthecountryhavebeeninspiredbyAshleyC.Fordtodonatemoneytopayoffdebtsowedbyparentsthatcanfollowkidsthroughouttheirschoolcareers. ItreallyhithomeformesaidKristinaArwoodwholaunchedacampaignthatraised﹩20000topaylunchdebtsinherregion.Igrewuponfreeandreduced﹣pricelunchesbuteventhat40centswashardtogettogetherwithfourkids.ThereweretimesIwouldn'teatbecauseIdidn'thavemoney. Theeffortdrewsomecriticismfrompeoplewhosaidsomeofthemoneyisowedbyparentswhocanaffordthe﹩2.50forlunchbutlettheiraccountsrunintothered.Buttheresponsehasbeenmostlypositive. It'sunrealistictothinkdonationsaregoingtofixthisproblemforallschooldistrictssaidDianePratt﹣Heavnerspokeswomanfortheassociation. Fordsaidherrealaimwastoinspireabiggerwaveofcommunitygiving.ShesaidItwasjustoneideaanotherschoolmightneedhelpwithuniformsortutoring.Thepointwastodosomethingthathelpspeopleinyourcommunity. 1Kidswithoverduelunchaccountsmaybethose. A.whorefusetobringtheirlunchmoneytoschool B.whoseparentsareunwillingtopaytheaccountsinadvance C.whosefamilyfailtopayfortheirmealsevenatreducedprices D.whowouldhavethedebtsfollowthemthroughouttheirschoolyears 2WhichofthefollowingstatementsaboutthecampaignlaunchedbyAshleyC.FordisRIGHT? A.Itcouldsolvetheproblemofschoolchildrenfailingtopaytheirmeals. B.Itreceivedwidesupportandcriticismfromsomepeopleaswell. C.ItraisedenoughmoneytocovertheIOUsinallschooldistricts. D.Italsofocusedonhelpingkidswiththeirschooluniforms. 3WhatdidKristinameanbysayingItreallyhithomeformeinParagraph4? A.Shewasrathersurprisedatwhatthekidsexperienced. B.Shefeltasifshewerestrickenbythekids'sufferings. C.Shefelttouchedbecauseofhersimilarexperiencesinchildhood. D.Herfamilyweresufferingbecauseofherdonationtothecampaign. 4WhatisAshleyC.Ford'srealaimtoappealtoherTwitterfollowerstodonatetothekids? A.Toensurethatthegovernmentgetuniversalfreemealsforallstudents. B.Toarousepeople'sconcernaboutthosewhoneeduniformsortutoring. C.Toraiseenoughmoneytopaythelunchdebtsinalltheschools. D.Toencouragemorepeopletotakeactiontohelpthoseinneed.
氮元素是植物生长的必需元素合理施用氮肥可提高农作物的产量．回答下列问题． 1植物细胞内在核糖体上合成的含氮有机物是在细胞核中合成的含氮有机物是叶绿体中含氮的光合色素是． 2农作物吸收氮元素的主要形式有铵态氮NH4+和硝态氮NO3﹣．已知作物甲对同一种营养液以硝酸铵为唯一氮源中NH4+和NO3﹣的吸收具有偏好性NH4+和NO3﹣同时存在时对一种离子的吸收量大于另一种．请设计实验对这种偏好性进行验证要求简要写出实验思路预期结果和结论．
假定你是学生会__李华下周你所在学校要接待来自英国的交换生.请你代表学校写一篇欢迎辞要点如下 1.表示欢迎2.介绍活动安排3.表达愿望. 注意1.词数80左右2.可适当增加细节以使行文连贯.
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