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（1）计算：4cos60°﹣（﹣2）2+（π﹣2019）0 （2）化简：（a+1）2﹣（a+2）（a﹣2）
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计算﹣4cos60°﹣π﹣3.140﹣﹣1
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计算＋－30－|－|－2-1－cos60°＝____________.
计算3tan30°﹣2tan45°+2sin60°+4cos60°.
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4cos60°+﹣12019﹣|﹣3+2|
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计算﹣14+2﹣20+|﹣2015|﹣4cos60°.
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先化简再求值﹣÷其中x=4cos60°+1.
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计算＋12cos60＋20
计算|﹣2|+2﹣1﹣cos60°﹣1﹣0.
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10分Therewasoncealonelygirlwhowantedloveverymuch.Onedaywhileshewaswalkinginthewoodsshefoundtwobirds.1Shetookcareofthemwithloveandthebirdsgrewstrong.Everymorningtheygreetedherwithabeautifulsong.Thegirlfeltgreatloveforthebirds.Shewantedtheirsingingtolastforever.2Thelargerandstrongerofthetwobirdsflewoutofthecage.Thegirlwatchedworriedlyasheflewaboveher.Shewassofrightenedthathewouldflyawayandshewouldneverseehim.Soasheflewcloseshecaughthimquickly.Shefeltveryhappy.3Herlovehadkilledhim.Shenoticedtheotherbirdstandingatthedoorofthecage.Shecouldfeelhisgreatneedforfreedomandhisneedtoflyintotheclearbluesky.4Thebirdflewaroundheroncetwicethreetimes.Thegirllookedhappilyatthebird'senjoyment.Herheartwasnolongerconcernedwithherloss损失.5Suddenlythebirdflewcloserandlandedsoftlyonherhand.Itsangthesweetestsongshehadeverheard. Thefastestwaytoloseloveistoholdontootightthebestwaytokeeploveistogiveitwings! A.Onedaythegirlleftthedoortothecageopen. B.Sheliftedhimfromthecageandfreedhim. C.Shetookthemhomeandputtheminasmallcage. D.Thebirdsweresobeautifulthatshelovedthemverymuch. AB.Shewantedthebirdtobehappy. AC.Sherealizedhermistake. AD.Howeverwhensheopenedherhandshefoundthebirdhaddied.
为了缓解上学时校门口的交通压力某校随机抽取了部分学生进行了调查来了解学生的到校方式并根据调查结果绘制了如下统计图表 某校学生到校方式抽样调查统计表 到校方式 学生人数 乘车 90 骑车 m 步行 20 其他 50 根据统计图所提供的信息解答下列问题 1本次抽样调查中的样本容量是m＝ 2扇形统计图中学生到校方式是“步行”所对应扇形的圆心角的度数是 3若该校共有1500名学生请根据统计结果估计该校到校方式为“乘车”的学生人数 4现从四名采取不同到校方式的学生中抽取两名学生进行问卷调查请你用列表或画树状图的方法求出正好选到到校方式为“骑车”和“步行”的两名学生的概率．
8分WhileassistedlivingcentershavebeenavailableintheUnitedStatesformanyyearsthegrowthandavailabilityofassistedlivinghashadadramaticincreasesincetheearly1990s.Anassistedlivingcenterisaresidentialalternativethatpromotesmaximumindependenceforeachresidentthroughacombinationofsupportiveservicesandassistance.Thedefinitionofassistedlivingfromonestatetoanothermayvaryandsowillthecostandtypesofservices. Assistedlivingcentersvaryinsizestyleandtheoptionalservicestheymayoffer.SmallfamilystylelivingorthelargercomplexofunitscanbefoundintheUnitedStates.Somefacilitiesareoperatedbynonprofitorganizationswhileothersareproprietary.Inadditionsomefacilitiesmaybeco﹣locatedoraffiliated附属withahospitalornursingfacility. Anassistedlivingcenterisanyinstitutionresthomeboardinghomeplacebuildingoragencythatismaintainedandoperatedtoprovidepersonalcareandserviceswhichmeetsomeneedbeyondbasicprovisionoffoodshelterandlaundryinafreestandingphysicallyseparatefacilitywhichisnototherwiserequiredtobelicensed. Ingeneraltermsanassistedlivingcenterisrequiredtoprovideassistancewithdailylivingactivitiesincludingeatingbathingdressingandpersonalhygienethreemealsadaysupervision监督管理ofself﹣administrationofmedicationslaundryserviceincludingpersonallaundryhousekeepingand24﹣hourstaffing. 1Whatisanassistedlivingcenter? A.Ahotelthatservesmeals. B.Aplaceforchildrentobetakencareof. C.Anentertainmentplaceforadults. D.Aplacewhichgivessupportiveservicesandassistance. 2WhichofthefollowingisTRUE? A.Allassistedlivingcentersofferthesamekindsofservices. B.Allassistedlivingcenterscostthesame. C.TherearedifferentkindsofassistedlivingcentersintheUnitedStates. D.Allassistedlivingcentersareofthesamesize. 3Theunderlinedwordproprietaryinthesecondparagraphprobablymeans A.state﹣owned B.governmental C.ownedbyacharityorganization D.private 4What'sthebesttitleforthepassage? A.What'sanassistedlivingcenter? B.AssistedlivingcentersarepopularintheUnitedStates. C.Assistedlivingcentersoffergoodservices. D.Welcometotheassistedlivingcenter.
30分Todaymobilephonesandcomputersareverypopular.Manypeopleusethemto1witheachother.Byusingamobilephoneoracomputeryoucansendmessages2.quicklyandasoftenasyoulike.Nolongerisit3tofindapenorpaper4anenvelopeorastamp. Arewe5anythingbynotwritingactualletterstopeople?Istheexperienceof6suchlettersworththetroubleofwritingthem?MostpeoplewouldprobablyreplyNoitwasawasteof7anyway.Thisisamuchbettersystem.It'shardtoargueagainstsuchalogicalviewpoint.8Iwouldliketotry. I9thatthekindsofletterspeopleusedtowritetendedtobemore10thanthevastmajorityofthebillionsofemailsandtextmessagessenttoday.Ofcoursewhenitcomestosendingquickmessagesto11specificinformationemailsandtextmessagesarethebest.12timeisimportanttheyareparticularlyuseful.Ifhoweveryouwanttoreallyreachoutandtouchsomeonealetterismore13. Handwrittenlettersarethemostpersonal.Ifyoucantypefastyoucanfitalotintoan14.What'slackingisthatspecialsenseofthepersonthatcomesfromseeingherorhishandwriting.Aslongasit'slegible容易辨认的itdoesn'tmatterhow15itis.Whensomeonesitsdownand16justforyouyoufeelthatwhenyou'rereadingit. ThoughI'mateenagerIconfess承认thatItoofeel17toreceivealetterinthemail.Iloveseeingmy18writtenbyhandonanenvelope.Imakemyselfanicecupofcocoaorlemonadesitdownina19placeopenmyletterand20everythingthatthepersonputintothosewordsjustforme.Whatagift! 1A.play B.compare C.communicate D.deal 2A.politely B.proudly C.carefully D.easily 3A.necessary B.strange C.difficult D.curious 4A.exceptfor B.letalone C.alongwith D.insteadof 5A.changing B.achieving C.learning D.missing 6A.receiving B.collecting C.sending D.copying 7A.time B.space C.breath D.feeling 8A.Therefore B.Beside C.However D.Finally 9A.doubt B.believe C.predict D.imagine 10A.useful B.amusing C.meaningful D.cheerful 11A.seek B.convey C.find D.store 12A.Unless B.Until C.If D.Though 13A.personal B.formal C.direct D.interesting 14A.email B.book C.diary D.letter 15A.tidy B.large C.beautiful D.clear 16A.works B.thinks C.practices D.writes 17A.confident B.excited C.nervous D.surprised 18A.message B.address C.name D.idea 19A.crowded B.comfortable C.safe D.terrible 20A.explain B.remember C.understand D.enjoy
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8分Acouplehadasonelevenyearsaftertheymarried.Teywerealovingcoupleandtheboywastheappleoftheireye.Whentheboywasaroundfouryearsoldonedaytheftherwasverytiredafterworksoheaskedhiswifetopickuptheirson.Themotherwhowasverybusyinthekitchentotallyforgotaboutit. Latertheboylosthiswayonthestreet.Whenthesonwasfoundmissingthemotherhurriedtolookforhimbutshedidn'tfindhim.Themotherfeltverysadanddidn'tknowhowtofaceherhusband. Whenthefatherwenttothepolicestationafterhearingthatthesonwasmissinghelookedathiswifeandsaidjustfourwords.Whatdoyouthinkthefourwordswere?ThehusbandjustsaidIloveyoudarling. Thesonwasmissing.Ifshehadpickedhimupearlierthiswouldnothavehappened.Thereisnopointinblaming责备anyone.Hiswifehadalsolostheronlychild.Whathiswifeneededatthatmomentwascomfortandunderstandingfromherhusband.Thatiswhatthehusbandgavehiswife.Severalweekslaterwiththehelpofthepolicethecouplefinallyfoundtheirlostson.Thefamily'srelationshipbecamestrongeroverthattime. Sometimeswespendlotsoftimeaskingwhoistoblame责备Wemissmanychancestogiveeachothersupportandleteachotherfeelthewarmthofhumanrelationships关系.Getridof摆脱allyourunwillingness不乐意toforgive宽恕selfishnessandfearsandyouwillfindtheworldismuchmorewonderful. 1Whatisthemeaningoftheunderlinedphrasetheappleoftheireye? A.Apersonwhoalwayshasasweetsmileintheiropinion. B.Apersonwhoisasprettyasanappleintheiropinion. C.Apersonwhoislovedmorethananyoneelseintheiropinion. D.Apersonwholookslikeanappleintheiropinion. 2Whydidn'tthefatherpicktheboyuphimself? A.Hewasverylazy. B.Hethoughtthemotherhadpickedhimup. C.Heforgottopickhimup. D.Hewastootiredtodoit. 3Whatcanwelearnfromthispassage? A.Becarelessineverythingyoudo. B.Loveisn'tthemostimportantthing. C.Learntoforgiveothers. D.Everyonecanberight. 4Whatdoyouthinkofthehusband? A.Warmhearted. B.Careful. C.Hardworking. D.Broad宽minded.
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25分假定你是星光中学的李华将参加主题为Let'sRideBicycles的演讲比赛.请撰写一份演讲稿主要内容包括 1.目前汽车带来的空气污染和交通阻塞等问题 2.骑自行车的益处如节能环保有利健康等. 参考词汇低碳生活low﹣carbonlife节能energy﹣saving 注意1.词数100左右. 2.演讲稿开头和结尾已给出不计入总词数. Goodmorningeveryone IamLiHuafromXingguangMiddleSchool.ThetopicofmyspeechisLet'sRideBicycles. Thankyou.
8分FirstLadyMichelleObamaisabigfanofvolunteering.Volunteeringmeansworkingforfreetohelpsomeoneelse.Mrs.Obamasaysvolunteeringisveryimportant.Itshouldbepartofeveryone'slifeshesays. Manyteensagree.Theysaythathelpingothersfeelsgreatandmakesadifference.Thesedaysmoreteensvolunteerthanworkforpay.Teenscleanupparkswalkdogsatanimalsheltersvisittheelderlyandmore. Somecities﹣﹣﹣﹣includingSeattleChicagoandWashingtonD.C.﹣﹣﹣﹣requirehighschoolstudentstovolunteer.Studentsmustvolunteerinordertograduate.Thestudentvolunteerslearnnewskillsandhelptheircommunities. Manyparentsareinfavoroftheidea﹣﹣﹣﹣theysayvolunteeringhelpsteensbuildjobskills.Butmostteensdon'twanttobeforcedtovolunteer.Theysaytheyarebusy.Andtheysayvolunteeringisonlyfunifit'sachoice. Readbothsidesofthedebateanddecide. YES Volunteeringcanhelpteensgetintocollegeorgetajob. Manycitiesandtownsneedhelp.Volunteerscanhelpkeepimportantprogramsgoing. Notallteenswillvolunteerifitisn'trequired.Schoolsshouldrequirestudentstodoalltheycantogetreadyforadultlife. NO Mostteensarealreadyverybusywithclasseshomeworkjobsandsports.Forcingthemtodomoreisn'tfair. Itshouldbeuptoeachperson.Helpingoutdoesn'tfeelasgoodifyouhavetodoit. Findingavolunteerjobisn'talwayseasy.Studentsshouldn'tbekeptfromgraduatingbecauseofsomethingtheycan'tcontrol. 1ThewritermentionsMichelleObamainorderto. A.introducethetopicofthetext B.explainwhatvolunteeringis C.tellwhatshedoesfortheus D.showsheenjoysvolunteering 2AccordingtothetextinChicago. A.findingavolunteerjobisquiteeasy B.morepeoplewouldratherworkforpay C.volunteeringisamustforhighschoolstudents D.collegestudentshavetovolunteerbeforegraduation 3Theunderlinedpartareinfavorofinthetextmeans. A.drop B.develop C.catch D.like 4Whichquestiondoesthetextmainlydiscuss? A.Isvolunteeringgoodforstudents? B.Shouldstudentsberequiredtovolunteer C.Whatisthebesttimetovolunteer? D.Whichvolunteerjobsshouldstudentsdo?
8分 Usetheroof Ifyouhavetherightkindofroofsomeenergycompanieswillpaythecostoffixingsolarequipmentaround14000andletyouusetheenergyproducedfornothing.InreturntheygetpaidforunusedenergyfedbackintotheNationalGrid.Howeveryouhavetosigna25﹣yearagreementwiththesupplierwhichcouldpreventyoufromchangingtheroof. Useyourparkingspace Aparkingspaceorgaragewhichyouhaven'tusedcanmakemoney.Ifyouliveclosetoacitycenteroranairportyoucouldmakeanythingupto200or300aweek.PutanadvertisementforfreeonLetparkorAtmyhousepark. Rent出租aroom Notonlywillaspareroomearnyouanincomebutthankstothegovernment﹣backedrentaroomprogramyouwon'thavetopayanytaxonthefirst4500youmakeperyear.TryadvertisingyourroomonRoomspareorRoommateeasy. Makemoneyduringspecialevents Don'twantafull﹣timelodger?Thenrentonashort﹣termbasis.IfyouliveinthecapitalrentingaroomoutduringtheOlympicsorotherbigeventscouldbringinmoney.Grashpaddercanadvertiseyourspace. Liveonset Rentingyourhomeoutasafilmsetcouldearnyouhundredsofpoundsadaydependingonthefilmproductioncompanyandhowlongyourhomeisneeded.AquicksearchontheInternetwillbringupdozensofonlinecompaniesthatallowyoutoregisteryourhomeforfree﹣butyouwillbechargedifyourhomegetspicked. 1Ifinoneyearyouearn5000fromrentingaroomyouneedtopaythetaxbasedon. A.500 B.800 C.4500 D.5000 2Duringabigeventtorentoutaroomwherecanyouputanadvertisement? A.OnLetpark. B.OnRoomspare. C.OnRoommateeasy. D.OnGrashpadder. 3Ifyouhopetogetenergyfreeyoumust. A.signanagreementwiththegovernment B.payaround14000fortheequipment C.keeptheroofunchangedwithin25years D.selltherooftosomeenergycompanies 4Thetextismostprobablywrittenfor? A.Lodgers. B.Houseowners. C.Advertisers. D.Onlinecompanies
如图抛物线y＝ax2﹣3ax﹣4aa＜0与x轴交于AB两点直线y＝x+经过点A与抛物线的另一个交点为点C点C的横坐标为3线段PQ在线段AB上移动PQ＝1分别过点PQ作x轴的垂线交抛物线于EF交直线于DG． 1求抛物线的解析式 2当四边形DEFG为平行四边形时求出此时点PQ的坐标 3在线段PQ的移动过程中以DEFG为顶点的四边形面积是否有最大值若有求出最大值若没有请说明理由．
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