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2020年內(nèi)蒙古包頭市中考化學(xué)試卷一、選擇題(6212)為有效阻斷新型冠狀病毒的傳播公眾改變了許多生活習(xí)慣下列做法主要涉及化學(xué)反應(yīng)的( A.用醫(yī)用酒精殺菌消毒 B.保持社交距離C.改變握手擁抱禮節(jié) D.出門佩戴口2.下列物質(zhì)分類正確的是( )石油、煤、氫氣﹣﹣化石燃料過氧化氫、二氧化硅、臭氧﹣﹣C.HNO3、H2SO4、CH3COOH﹣﹣酸D.干冰、葡萄糖、蛋白質(zhì)﹣﹣有機(jī)3.下列說法正確的是( )A.不同種元素最本質(zhì)的區(qū)別是相對原子質(zhì)量的不同B.空氣質(zhì)量指數(shù)級別越高,空氣質(zhì)量越差C.飽和澄清石灰水變渾濁一定是發(fā)生了化學(xué)變化實(shí)驗(yàn)?zāi)康膶?shí)驗(yàn)操作A.實(shí)驗(yàn)?zāi)康膶?shí)驗(yàn)操作A.KClMnO2的固體混合物加足量的水溶解,過濾BNaClCaCl2向溶液中通入一定量的CO2,過濾C除去CO2中的CO將混合氣體通過紅熱的銅網(wǎng)D鑒別尿素和硫酸銨兩種氮肥A.A B.B C.C D.D已知:2Cu+2H2SO4+O22CuSO4+2H2已知:2Cu+2H2SO4+O22CuSO4+2H2O下列說法正確的是( )A.步驟②中分離操作必須用到的玻璃儀器是燒杯和漏斗B.溶液A中溶質(zhì)是H2SO4、CuSO4C.BDA向盛有一定質(zhì)量表面被氧化的鎂條的燒杯中,慢慢加入一定濃度的鹽酸。下列能正確反映其對應(yīng)變化關(guān)系的是( )A.B.C.D.二、填空題(421217(1)用化學(xué)符號填空:標(biāo)出新型凈水劑高鐵酸鈉(Na2FeO4)中Fe的化合價(jià) ;微粒的號 。圖1中實(shí)驗(yàn)操作或方法正確的是 (填序號。Cu(NO3)2、AgNO3Mg(NO3)2Zn,得到濾渣和濾液。①若向?yàn)V液中加入稀鹽酸無現(xiàn)象則濾液中一定含有的金屬離子是 (填離子符號。②若濾液為藍(lán)色,則濾渣中可能含有的金屬是 。t℃時(shí),分別取甲、乙兩種固體的溶液,恒溫蒸發(fā)水分,得到蒸發(fā)水的質(zhì)量(X)質(zhì)量(Y)2(析出的晶體不含結(jié)晶水。①t℃時(shí),在O點(diǎn)乙的溶液是 溶液(填“飽和”或“不飽和。②t℃時(shí),甲、乙的溶解度大小關(guān)系為:甲 乙(填“<“>”或“=8.根據(jù)圖1和圖2回答問題:從圖1中選出實(shí)驗(yàn)室既可用來制取氧氣又可制取二氧化碳的發(fā)生裝置 (填字母,該裝置制取氧氣所需的藥品是 。若要用裝置G收集甲烷,空氣應(yīng)從 (填“a”或“b)端排出。)若用金屬鋅和稀硫酸反應(yīng)制取并收集干燥的氫氣,從A~F中選用裝置的連接順序?yàn)椋ㄌ钭帜?。圖2乙裝置是測定空氣中氧氣含量的改進(jìn)裝(電熱絲通電引燃紅磷與甲裝置相改進(jìn)的優(yōu)點(diǎn)是 實(shí)驗(yàn)結(jié)束后觀察到從燒杯中進(jìn)入集氣瓶內(nèi)的水的體積仍明顯小瓶內(nèi)原空氣體積的,請分析可能的原因(至少答出兩點(diǎn)) 。A~F(部分反應(yīng)物、生成物及反應(yīng)條件已略去,圖中“一”表示相連的兩種物質(zhì)之間可以(1)A物質(zhì)的俗稱是 。(2)C物質(zhì)的化學(xué)式 。(3)寫出D→E的化學(xué)方程式 。鈉三種溶液混合后溶質(zhì)的成分進(jìn)行探究?!咎岢鰡栴}】反應(yīng)后溶液中溶質(zhì)的成分是什么?【查閱資料】Na2SO4溶液和BaCl2溶液呈中性【猜想假設(shè)】猜想1:反應(yīng)后溶液中的溶質(zhì)只有Na2SO42:Na2SO4、Na2CO33:Na2SO4、Na2CO3猜想4:反應(yīng)后溶液中的溶質(zhì)有Na2SO4、H2SO4【交流討論同學(xué)們認(rèn)為猜想 (填數(shù)字一定是錯(cuò)誤的理由是 。【繼續(xù)探究】為驗(yàn)證剩余猜想中哪一種是正確的,設(shè)計(jì)實(shí)驗(yàn):實(shí)驗(yàn)操作實(shí)驗(yàn)現(xiàn)象及結(jié)論三、計(jì)算題(共7分,請將解題過程寫在答題卡的對應(yīng)位置)MgCl2、KCl19g160.8gKOH5.8g,10%.計(jì)算:MgCl2的質(zhì)量。KOH參考答案1.A2.C3.B4.D5.D6.C7(1)用化學(xué)符號填空:2 4 2 4 標(biāo)出新型凈水劑高鐵酸鈉(NaFeO)中Fe的化合價(jià)Na O ; 微粒的符號 S2﹣ 。2 4 2 4 圖1中實(shí)驗(yàn)操作或方法正確的是C (填序號。Cu(NO3)2、AgNO3Mg(NO3)2Zn,得到濾渣和濾液。①若向?yàn)V液中加入稀鹽酸,無現(xiàn)象,則濾液中一定含有的金屬離子是 Zn2+、Mg2+ (填離子符號。②若濾液為藍(lán)色,則濾渣中可能含有的金屬是銅(Cu) 。t℃時(shí),分別取甲、乙兩種固體的溶液,恒溫蒸發(fā)水分,得到蒸發(fā)水的質(zhì)量(X)質(zhì)量(Y)2(析出的晶體不含結(jié)晶水。①t℃時(shí),在O點(diǎn)乙的溶液是不飽和 溶液(填“飽和”或“不飽和。②t℃時(shí),甲、乙的溶解度大小關(guān)系為:甲< 乙(填“<“>”或“=。8(1)從圖1中選出實(shí)驗(yàn)室既可用來制取氧氣又可制取二氧化碳的發(fā)生裝置是B (填字母,用該裝置制取氧氣所需的藥品是過氧化氫溶液和二氧化錳 。若要用裝置G收集甲烷,空氣應(yīng)從b (填“a”或“b)端排出。A~FBFD(。圖2乙裝置是測定空氣中氧氣含量的改進(jìn)裝(電熱絲通電引燃紅磷與甲裝置相改進(jìn)的優(yōu)點(diǎn)是裝置嚴(yán)密提高測量結(jié)果的準(zhǔn)確度操作簡便減少污染等 實(shí)驗(yàn)結(jié)束后觀察到從燒中進(jìn)入集氣瓶內(nèi)的水的體積仍明顯小于瓶內(nèi)原空氣體積的請分析可能的原(至少答出兩點(diǎn))裝置的氣密性差;紅磷量不足;裝置未冷卻到室溫就打開止水夾。9(4)A~FA,E(部分反應(yīng)物、生成物及反應(yīng)條件已略去(1)A熟石灰或消石灰。(2)CH2O。(3)D→EBaCl2+H2SO4=BaSO4↓+2HCl。10變紅。【交流討論同學(xué)們認(rèn)為猜想14 (填數(shù)字一定是錯(cuò)誤的理由是硫酸鈉溶液顯中性使酚酞試液變色,稀硫酸顯酸性,不能使酚酞試液變色 ?!纠^續(xù)探究】為驗(yàn)證剩余猜想中哪一種是正確的,設(shè)計(jì)實(shí)驗(yàn):實(shí)驗(yàn)操作實(shí)驗(yàn)現(xiàn)象及結(jié)論取少量溶液于試管中,加產(chǎn)生白色沉淀,是因?yàn)槁然^和硫酸鈉反應(yīng)生成白色沉淀硫酸鋇和氯再向上層清液滴加酚酞,觀察現(xiàn)象 3氫氧化鈉猜想2正確 【交流討論】1、4;硫酸鈉溶液顯中性,不能使酚酞試液變色,稀硫酸顯酸性,不能使酚酞試液變色。32正確。11(1)9.5g。(2)16%。2020年內(nèi)蒙古包頭市中考英語試卷第一部分聽力(共兩節(jié),20分)聽錄音,根據(jù)各題要求選擇最佳答案,井將答題卡上對應(yīng)題目的答案標(biāo)號涂黑.每項(xiàng)內(nèi)容讀兩遍.第一節(jié)(共1小題;每小題5分,共5分)5(1) (2) (3) (4) (5) (5315)5ABC556WhatdidDanielthinkofhistrip?Relaxingandinteresting.Excitingandenjoyable.Surprisingandexciting.WhodidDanieltravelwith?Hisparents.Hismother.Hisfather.WhatdidDanieldoinLondon?Hemadeatravelplan.Heboughtairtickets.Hevisitedfamous3.7WhendidtheystarttowatchA.At9:30.B.At9:00.C.At10:00.WhatkindofTVprogramsdoestheboyA.Cartoons.B.Talkshows.C.Gameshows.WhatwilltheydoA.Dohomework.B.Playtennis.C.Playvolleyball.8Wheredoesthegirlwork?Intheschooldininghall.Intheschoollibrary.Intheschoolradiostation.HowoftendoesPeterwritetohispenpal?Onceaweek.Twiceaweek.Onceamonth.WhatdotheyoftentalkaboutintheEnglishCorner?Games.Cultures.Places.9Whenwillthespeakersgotothetheater?A.OnThursday.B.OnFriday.C.OnSaturday.WherewillthespeakersA.Atthefront.B.Inthemiddle.C.Attheback.Howmuchisastudentticket?A.£7.B.£10.C.£12.5.10WhatfestivalwasA.ItwasFather'sDay.B.ItwasMother'sDay.C.ItwasMayDay.WhoswepttheA.Mr.Smith.B.Mrs.Smith.C.TomSmith.WheredidtheSmithshavedinner?A.Athome.B.Inarestaurant.C.Inafriend'shome.(15115(ABC入空白處的最佳選項(xiàng),井在答題卡上將該項(xiàng)涂黑.It'snicetohearfromheragain. ,welastmetmorethantenyearsago( A.What'sworse B.BelieveitornotC.Inotherwords D.That'stosay﹣Hello,mynameisJohnSmith.AndI'mcallingtoaskaboutthepositioninyourschool.﹣Yes,thepositionisstillopen.Youcouldcomeoverandhaveatalk us( A.with B.a(chǎn)bout C.through D.a(chǎn)wayWhileshewasinMilan,shedevelopeda forfineart( A.way B.relation C.taste D.habit theprojectasplanned,theyneedtoworktwomorehoursaday( A.Tofinish B.FinishingC.Finish D.Tobefinished﹣TomorrowI'lltakethefinalexamination,andIfeelnervous.﹣Don'tworry,it's tohavebutterfliesinyourstomachbeforeanexam( A.rude B.exciting C.perfect D.naturalHe sleep,althoughhetriedto.Onecupofcoffeeinthelateafternooncausedhimstayawakealmostallnight( )A.wouldn't B.shouldn't C.couldn't D.mustn'tHe'salreadyplayinginaband,andheonly playingtheguitarayearago!( A.tookup B.setup C.putup D.gaveupThegirlusedtobeshy,butsheis gettingactiveinteamworkandwillingtofriends( )A.usually B.gradually C.mainly D.seldomShesaysthatshe'llhavetoclosetherestaurant businessimprove( A.if B.a(chǎn)fter C.unless D.whenCornproduction nearly125percentoverthepast25yearsinChin( A.jumped B.jumps C.willjump D.hasjumpedSophiawaitedforareply,but came( )A.either B.a(chǎn)nother C.neither Livestreaming(直播) anewchancefortraditionalcultureartist( A.practices B.provides C.promises D.protectsEarthDay in1970forthefirsttime,andtheDaynowincludeseventsinmore190countriesandregions(地區(qū)( )A.celebrated B.wascelebratedC.iscelebrated D.hasbeencelebrated20.It'snoteasytochangehabits, withstrongwillandself﹣control,itpossible( )for B.or C.but D.so21.﹣Don'tworry,Mom.Thedoctorsaiditwasonlythe- I'lltellDadthere'snothingserious( A.Whatarelief!Congratulations!C.Whatfor?D.I'msorrytohearthat.(1I515)閱讀短文,從短文后各題所給的四個(gè)選項(xiàng)(AB、CD)中,選出可以填入空白處的最佳選項(xiàng),并在答題卡上將該項(xiàng)涂黑.Silentandcalm,25﹣year﹣oldLindalooksoutofthewindow.Shemaybesmilingbutit'sbeenalong,hardroadto(1) .Today,sheisanauthorofabest﹣andalsoafamousartist.Herstoryisaboutovercoming(2) andencouragingotherstodothesame.Lindadidnotbegintalking(3 shewastwoandahalfyearsold(4) it was found that she had autism (自閉癥) and had difficulty in socialcommunication.Linda'smothertaughtherthe(5) ofindependencebyexampleandencouragedhertolearnhowtodothings(6) .Growingup,shewas(7 bullied(欺凌.Shewascalledanalienandsomewouldevenstealhersnacks.Shetriedchangingschools,butsheneverseemedtobe(8) .Thebullying(9) .Shealsohadtroublewithtests.Butsheletthemstopher.Withthehelpofherparents,Lindareceivedspeechandcommunicationtreatment.Afteralongperiodoftreating,doctorssaidthatLindawouldnotsucceedorfinishherstudies.Butsheproved(證明)them(10) .Lindaworkedhardtobuildupconfidenceandfoundherability﹣creatingbeautifulpaintings.Andat18,Lindawentartcollegetostudypaintingandwaslater(11) bythelocalvolunteerstothemoncommunityvisitswhereshecould(12) herstory.Nowshehasgonethroughthe(13) times.Andshehascometo(14) sheisnotuseless.At25,Lindasellsherbooksandsomeofherpaintingstohelpherselfandherfamily.Bysharingherexperience,Lindaisnotonly(15) others,alsochangingtheirlives.(1)A.(2)A.wealthdecisionsB.B.politenessconditionsC.C.sadnessdifficultiesD.D.happinessdiscussions(3)A.ifB.becauseC.untilD.so(4)A.HonestlyB.UnluckilyC.ClearlyD.Suddenly(5)A.progressB.meaningC.instructionD.interest(6)A.bythewayB.rightawayC.inahurryD.onherown(7)A.hardlyB.secretlyC.recentlyD.seriously(8)A.welcomedB.refusedC.treatedD.a(chǎn)llowed(9)A.receivedB.developedC.continuedD.studied(10)A.wrongB.rightC.cleverD.silly(11)A.interviewedB.invitedC.trustedD.tested(12)A.shareB.coverC.copyD.complete(13)A.quietB.darkC.safeD.comfortable(14)A.realizeB.guessC.doubtD.remember(15)A.teachingB.savingC.influencingD.controlling(4630(ABD)中,選出最佳選項(xiàng),并在答題卡上將該項(xiàng)涂黑.23.FindaJobThisSummerThissummertherearethingsthatstudentscandotoearnsomepocketmoneyortohelpothers.Also,manyprogramsareofferedbyprovincialgovernmentanditspartnerstostudentsfindsummerjobs.Hereareafewideas.DeliverNewspapersTeenagerscandelivernewspapers﹣usuallyyourideabikearoundaneighborhoodleavethenewspaperateachhouse.Normallyyouhavetohaveyourownbike﹣andyoutogetupearlytoo,becausepeoplewanttheirnewspaperstoreadwiththeiryouare15﹣18andreturntoschoolthisfall,youcanfindjobsofthiskind.WashCarsIt'scrazyforadultstodrivetoanexpensivecarwashwhentheycangetateenagertothejobforlessmoney.Washthecarwellandcarefullyandpeoplewillwantyoutodoagain.Thenyou'vegotcustomers!GiveOlderPeopleaHandLotsofolderpeoplearehappyforteenagerstohelpthemcarrytheirshoppingorsmallthingsforthem,likewashingorkeepingthemcompany(陪伴Youearnmoneynot,andpeopleintheneighborhoodgetyourhelp.JobProgramsIfyouareastudentlivingincertaincommunitiesoftheprovince,youarelucky.Thereareprogramsthatprovidefourweeksofpaidjobsalongwithtraining.Afterthat,canstartandrunyourownsummerbusiness,andyouhaveachanceofwinningawardsofupto$1000.Gotothegovernmentwebsitetolearnmoreabouttheseprograms.People25couldbuildskills,findajoborstartbusinessesallyearround.Theyareallgreatideas.Justchooseoneofthemtomakesomemoney.Thenspenditorsaveit.Butdon'tforgetit'simportantalwaystotellanadultwhereyouaregoing.WhatisspecialaboutDeliverNewspapers? Itrequiresonetogetupearly.Itneedspatienceandstrongbody.Itoffershelptoneighbors.Itgivestrainingbeforework.Whichoneprovidestraining? DeliverNewspapers.WashCars.GiveOlderPeopleaHand.JobPrograms.Whatcanyoulearnfromthepassage? It'shardforteenagerstofindjobs.Theeldersdon'twanthelpfromteenagers.Washingcarsisthebestchoiceforteenagers.Whateveryouwanttodo,safetycomesfirst.OnewindydayinJune,F(xiàn)ourthClasstookthetraintoChinatown.WehadbeguntoPutonghuaandourteachersaidthisexcursionwouldletuspracticeourlanguageskillslearnmoreaboutChineseculture.WeenteredChinatownthroughthearched(拱形的)entrancegatewithredpaintedpillars(柱子.Bigstonelionssatoneachside.ThenInoticedthatthestreetsignswritteninbothChineseandEnglish.IphotographedthesignforHayStreet.ThenextplacewevisitedwastheChineseGardenofFriendshipwhichwasverypeaceful.Therewerewaterfalls,hiddenstonepathsandabeautifulteahouse.Wehadawonderfultimethere.AtlastitwastimeforourChineseenteredabigrestaurantthathadredlanternshangingfromtheroofandreddragonsonthewalls.ThewaitersgreetedusinPutonghuaweansweredtheminPutonghua.WewereshownhowtousechopsticksandhowtochoosefromthemenuswithChinesewriting.At2:30weleftChinatown.Wewereallverytired.Onthetrain,ourteachertoldherexperienceinChina.ShewasjustbackfromseeingtheGreatWallofChina.It'slikealongdragonwindingitsway.Weweretolditisthelongestwallintheworld.Aswewerelistening,onestudent,whoIcouldn'tname,fellasleeponthetrainandsnoredfaceturnedredwhenhewokeup!Inthepast,IoftentoldmyChineseclassmateshowtospeakEnglish.Nowtherearemorepeoplethaneverwhoarestudyingcanunderstandwhy﹣it'safascinatingandtherearealwaysnewwordstobediscovered!IcannotforgetourexcursiontoChinatownTomGreen,F(xiàn)ourthClassTheunderlinedword"excursion"inParagraph1means A.trainB.tripC.placeD.dayWhatwasthefirstthingconnectedwithChineseculturethatthestudentssawChinatown? A.Thebeautifulteahouse.B.Chopsticksusedintherestaurant.C.ThestreetsignswritteninbothChineseandEnglish.D.Thearchedentrancegatewithstonelionsoneachside.Thecolorredismentionedfourtimesinthetext.Whichexampleisdifferentfromothers? Theredpaintedpillarsoftheentrancegate.Thereddragonsintherestaurant.Theredlanternsintherestaurant.Thestudent'sredface.Whatisthemainpurposeofthistext? TodescribeChineseculture.TodescribeTom'sfavoriteChinesemeals.ToretellwhathappenedonTom'striptoChinatown.TogiveinformationaboutChineseeatingcustoms.Lastweek,someGermanparentswhotooktheirkidsoutofschoolearlywerestoppedthepoliceattheairport.Thepoliceweremakingreportsonstudentswhodidn'tpermission(許可)tomissschool.Likemanyplaces,itisagainstthelawtoskip(不參加)schoolinGermany.Childrenovertheageof9can'tmissclasseswithoutpermissionfromtheschool.Butduringbusytraveltimes,someparentstaketheirchildrenoutofschoolearlytosavemoneyvacations.Peoplecanoftensavealotofmoneyonflightsandhotelsbygoingatadifferenttimethanothers.LastweekendwasthebeginningofanimportantholidayperiodinGermany.Peoplechargeoftheschoolsaskedthepolicetocheckandmakesurethatstudentsweren'tforvacationsbeforetheywereallowedto.PoliceofficersatthreeGermanairportslookedforfamilieswithschool﹣children.Whentheyfoundthem,thepolicepulledthefamiliesoutoflinestotalkthem.Theywantedtofindoutiftheparentshadpermissionforthechildrentobeoutofschool.Ifthechildrendidnothavepermission,thepolicereportedthefamiliestoschoolsandtothegovernment.Inall,thepolicereportedabout20families.Thesefamilieswillhavetwoweekstoshowthatitwasokayfortheirchildrentomissschool.Iftheycan't,theymayhavetopayasmuchas$1200asafine(罰款orreceivesomeotherpunishment.Germanyisnottheonlyplacewhereparentshavetopayfinesiftheirchildrenschool.ManyothercountriesandmanyofthestatesintheU.S.havesimilarlaws.Thegoodnewsisthatthefamilieswereallowedtogoonvacationaftertheytalkedtothepolice.Buttheymighthaveabigbillwaitingforthemwhentheygetback.WhydosomeGermanparentstaketheirchildrenoutofschoolearlyduringbusytimes? Theycanspendmoretimewiththeirchildren.Theirchildrenwillstudybythemselves.Theywanttosavemoney.Theirchildrencantakeonlinecourses.InParagraph4,policeofficersatthreeGermanairportswantedto .findstudentswhoskippedschoolwithoutpermissiongivepunishmenttothestudentstheretakestudentsbacktoschoolwaitforschoolmanagersWhichofthefollowingcanbethebesttitleforthetext? LawsonVacationsinGermanyGiveYourFamilyaPerfectVacationDon'tSkipSchoolinGermanyPunishmentGoestoFamiliesWheredoesthistextprobablycomefrom? Anewspaper.Asciencereport.Atravelguide.Atextbook.Maybeyoushouldsitdownbeforeyoureadthis.It'salittlefrightening.Yoursittingmaybekillingyou.HealthexpertssaytheU.S.a(chǎn)dultnowsitsabout6.5hoursaday.Thatisupaboutanhouradaycomparedto2007.Thenewsisevenworseforteens.TheysiteighthoursinformationwasputoutbytheNationalCenterforHealthhascollectedthenumbersforthepast16years.Itisworriedaboutwhatithasfound.Researchshowsthatpeoplewhoarenotactivecangetsick.Theirbonesgetburnfewercalories(卡路里.Thatmakesthemmorelikelytoputontoomuchweight.Theymightevengetdiabetes(糖尿病Theyareatriskforhighbloodpressureandheartproblems,too.Someexpertsalsothinksittingtoomuchcaninfluencehowyourbloodmovesthroughbodyandhowwellyourbodyfightsoffillness.Beingactivehelpsinlotsofways.Itmakeyouhappier,burnmorecaloriesandgiveyoumoreenergy.Itcanalsohelpyousleepbetter.About60%ofpeopleintheU.S.watchatleasttwohoursofTVeachday.Thatnumberhasstayedaboutthesameinrecentyears.Computersarethebiggestreasonformorehoursspentsitting.Computeruseoutsideworkorschoolhasgoneupforallagegroups.Now,50%ofadultsspendatleastanoftheirfreetimeonacomputereachday.Thatisupfrom29%in2003.About53%ofteensnowspendatleastanhouroffreetimeoncomputers.Sodo56%ofkids.Asmanyas1in4peoplewhousecomputersuseoneforthreehoursormoreofworkandschool.Sogetup,takesomebreaksandgooutside.Youmightsaveyourlifebydoingoutdooractivities.Thetextisespeciallyhelpfulforthosewhocareabout A.theirbodyshapetheirhomecomfortstheirhealththeirfoodBeingactivecanhelppeople A.burnmorecaloriesforgettheirpressuregetsicktreatheartproblemsWhatisthetextmainlyabout? A.Computersarecausinghealthproblems.B.Toomuchsittingisinfluencingourhealth.C.Beingmoreactiveisgoodforyouandme.D.Sittingmeanskilling.Whichoneofthefollowingismostprobablytobediscussednext? A.Thecauseofdiabetes.B.Introducesomeoutdooractivities.C.GivesomeexamplesoflosingweightsuccessfullyD.Listsomedisadvantagesofplayingcomputergames.II(40)(共兩節(jié),25)(101共10分)用括號中所給單詞的適當(dāng)形式完成句子(每空僅限1個(gè)單詞.Thereisn'tacloudinthesky.It'sgoingtobe tomorrow.(sun)28.He'saquietartistanddoesn'tliketotalkmuch,buthiswork 29.Peoplewhoarewarm﹣heartedsetgoodexamplestosocietybecausetheypassontopeoplearoundthem.(kind)30.﹣What'syourplanafterthe﹣Wearegoingtotakea flighttoChengduwhentheexamisover.31.It'slateautumnnow.Thetreehaslostallof leaves.(it)32.AsIwastryingtofindmywayout,Isuddenly somenoise.(hear)33.WhenyouvisitNewYork,don'tmissBroadway.Ithasbeenfamousforitstheaterstheearly century.(twenty)34.﹣Whatareyougoingtodowiththe-Someclotheswillbegiventothepoorandtheotherswillbesenttofactoriesfor (recycle)Theyhopedtoseetheproblemsolved .(peaceful)Inordertoliveinabetterplace,thenaturalenvironmentmustbe allthepeople.(protect)(115151完整.LastSaturdaymorning,theheadteachercalledameetingofparents.Onbehalfof(代表)thestudents,Imade(1) speech,andIfeltveryproudof(2) Nowmymiddleschoollifecomestoanend.Thissummer,IwillgototheU.S.a(chǎn)ndstayforoneyearto(3) atanAmericanhighschool.ThereIwillbeinGrade10Ifeelexcited(4 (同時(shí),IamalittlesadbecauseIhaves goodbyetomyoldfriendsandteachers.Iwantto(6)t somephotoswiththembeforeIleaveandIwill(7) (贈送)manygiftstomyfriendsaswell.We(保持聯(lián)系)witheachotherbysendingemails,makingphonecallsor(9)w letters.Inthepastthreeyears,Ihavelearnedalot(10) myteachersandhaveagreattimeatschool.Althoughwe'llsetoutonournewjourney,IwillneverIcomefrom.Inthefuture,Iwillworkharder.IhopetobeadoctorwhenI(13 (長大.Myparents(14 t]meallthetime.Ibelievemydreamwill(15) (實(shí)現(xiàn),成為現(xiàn)實(shí))!第二部分書面表達(dá)(15分)Time10a.m.nextSundayPlaceschoolsportsfieldActivitiesforstudentsselltickets,Time10a.m.nextSundayPlaceschoolsportsfieldActivitiesforstudentsselltickets,workatfoodofthewillgotocharity)playtheviolin,piano…singsongs,danceto…1.902.可適當(dāng)增加細(xì)節(jié),以使行文連貫;3.文中不得出現(xiàn)反映考生信息的真實(shí)人名、地名等內(nèi)容參考詞匯: 攤位stand 慈善charityDearAlan,Howisitgoing? Lookingforwardtoyourreply.Yours,LiHua參考答案7.B8.A9.C10.A11.D12.C13.A14.B15.C16.D17.D18.B19.B20.C21.ADCCBBDDACABABACADDBDDCCACA26(1)ThetextisespeciallyhelpfulforthosewhocareaboutC .BeingactivecanhelppeopleA .Whatisthetextmainlyabout?B Whichoneofthefollowingismostprobablytobediscussednext?B 27.sunny.28.shouts.29.kindness.30.direct.31.its32.heard33.twentieth34.recycling35.peacefully36.protected37(1)a(2)myself(3)study(4)Atthesametime/Inthegiveaway(8)keep/stay/beintouch(9)writing(10)from(11)where(12)much(13)growup(14)support(15)cometrue38.DearAlan,Howisitgoing?OurschoolwillholdamusicfestivalnextSundayontheschoolsportsfield.Knowingthatyouarefondofmusic,I'mwritingtoinviteyoutojoinus.Thefestivalwillstartat10:00amandlastabouttwohours.Studentsfrommyschoolwillgivefantasticperformances,includingplayingtheviolin,piano,guitarandsoon.Besides,wecansingsongsanddancetomusic.Meanwhile,someofmyclassmateswillsellticketsandIwillworkatafoodstand.Allofthemoneywillgotocharity.Lookingforwardtoyourreply.Yours,LiHua一、單選題

內(nèi)蒙古包頭市2020年中考數(shù)學(xué)試卷1.的計(jì)算結(jié)果是( )A.5 B.C.D.年初國家統(tǒng)計(jì)局發(fā)布數(shù)據(jù)按現(xiàn)行國家農(nóng)村貧困標(biāo)準(zhǔn)測算截至2019年末全國農(nóng)村貧困口減少至551萬人,累計(jì)減少9348萬人.將9348萬用科學(xué)記數(shù)法表示為( )A.C.3.點(diǎn)A在數(shù)軸上,點(diǎn)A所對應(yīng)的數(shù)用B.D.表示,且點(diǎn)A到原點(diǎn)的距離等于3,則a的值為()A. 或1 B. 或2C. D.14.下列計(jì)算結(jié)果正確的是()A.B.C.D.5.如圖,是的外角,.若,,則 的度數(shù)為( )A.B.C.D.如圖,將小立方塊①從6個(gè)大小相同的小立方塊所搭的幾何體中移走后,所得幾何體( )主視圖改變,左視圖改變 B.俯視圖不變,左視圖改變C.俯視圖改變,左視圖改變 D.主視圖不變,左視圖不變兩組數(shù)據(jù)與的平均數(shù)都是若將這兩組數(shù)據(jù)合并為一組新數(shù)據(jù)則這組新數(shù)據(jù)的眾數(shù)為( )A.2 B.3 C.4 D.5如圖在中,是 的中點(diǎn),交的延長線于點(diǎn)若, ,則 的長為( )A.9.如圖,是B.的直徑,C.是弦,點(diǎn)在直徑D.的兩側(cè).若,,則的長為()B. C. D.下列命題正確的是( )若分式的值為0,則的值為±2.B.一個(gè)正數(shù)的算術(shù)平方根一定比這個(gè)數(shù)?。瓹.若 ,則.D.若,則一元二次方程有實(shí)數(shù)根.如圖在平面直角坐標(biāo)系中直線 與軸軸分別交于點(diǎn)和點(diǎn)是線段上一點(diǎn),過點(diǎn)作軸,垂足為軸,垂足為.若雙曲線經(jīng)過點(diǎn)則的值為( )B. C. D.如圖在中,,按以下步驟作圖(1分別以點(diǎn)為圓心以大于的長為半徑作弧兩弧相交于 兩(點(diǎn)在 的上方2作直線交 于點(diǎn)交于點(diǎn)(3用圓規(guī)在射線上截取連接過點(diǎn)作,垂足為交 于點(diǎn)下列結(jié)論:①;②;③;④若,則四邊形的周長為25.其中正確的結(jié)論有( )A.1個(gè)B.2個(gè)C.3個(gè)D.4二、填空題13.在函數(shù)中,自變量的取值范圍是 .14.分式方程的解是 .15.計(jì)算: .如圖,在正方形ABCD是對角線BD上一點(diǎn),AE的延長線交CD于點(diǎn)連接CE.若∠BAE=56° ,則∠CEF= °.一個(gè)不透明的盒子里放置三張完全相同的卡片,分別標(biāo)有數(shù)字1,2,3.隨機(jī)抽取1張,放回后隨機(jī)抽取1張,則抽得的第二張卡片上的數(shù)字大于第一張卡片上的數(shù)字的概率為 .如圖,在平行四邊形中,的平分線與的平分線交于點(diǎn)若點(diǎn)恰好在邊 上,則的值為 .在平面直角坐標(biāo)系中,已知和是拋物線上的兩點(diǎn),將拋物線的圖象向上平移是正整數(shù))個(gè)單位,使平移后的圖象與軸沒有交點(diǎn),則的最小值為 .如圖在矩形中, 是對角線, 垂足為連接若,則如 的值為 .三、解答題我國技術(shù)發(fā)展迅速全球領(lǐng)先某公司最新推出一款產(chǎn)品為了解用戶對該產(chǎn)品的滿意30(單位:分:83 92 68 55 77 71 73 62 73 95 92 94 72 64 5966 71 75 69 86 87 79 81 77 68 82 62 77 61 88整理上面的數(shù)據(jù)得到尚不完整的頻數(shù)直方圖(如圖.請根據(jù)所給信息,解答下列問題:補(bǔ)全頻數(shù)直方圖;參與調(diào)查的一個(gè)用戶說30根據(jù)用戶滿意度評分,將用戶的滿意度從低到高分為三個(gè)等級:滿意度評分低于60分60分到89分不低于90分滿意度等級不滿意滿意非常滿意估計(jì)使用該公司這款產(chǎn)品的1500個(gè)用戶中,滿意度等級為“非常滿意”的人數(shù).如圖,一個(gè)人騎自行車由地到地途經(jīng)地當(dāng)他由地出發(fā)時(shí),發(fā)現(xiàn)他的北偏東方向有一電視塔他由地向正北方向騎行了到達(dá)地,發(fā)現(xiàn)電視塔在他北偏東方向,然后他由地向北偏東方向騎行了到達(dá)地.的距離;的距離.某商店銷售兩種商品種商品的銷售單價(jià)比種商品的銷售單價(jià)少40元件種商品和3件B種商品的銷售總額為820元.種商品的銷售單價(jià)分別為多少元?該商店計(jì)劃購進(jìn)兩種商品共60件,且兩種商品的進(jìn)價(jià)總額不超過7800元,已知A種商品和B種商品的每件進(jìn)價(jià)分別為110元和140元,應(yīng)如何進(jìn)貨才能使這兩種商品全部售出后總獲利最多?24.如圖, 是的直徑,半徑,垂足為O,直線l為的切線,A是切點(diǎn),D是上一點(diǎn),的延長線交直線l于點(diǎn)是上一點(diǎn),的延長線交于點(diǎn)連接,已知3,,.求 的長;求的值及的長.如圖,在中,,,繞點(diǎn)按順時(shí)針方向旋轉(zhuǎn)得到,與 交于點(diǎn)如圖,當(dāng)時(shí),過點(diǎn)作,垂足為連接 .①求證: ;②求的值;如圖,當(dāng)時(shí),過點(diǎn)作,交于點(diǎn)交的延長線于點(diǎn)求的值.如圖在平面直角坐標(biāo)系中拋物線經(jīng)過坐標(biāo)原點(diǎn)與軸正半軸交于點(diǎn)該拋物線的頂點(diǎn)為直線經(jīng)過點(diǎn)與軸交于點(diǎn)連接 .的坐標(biāo);將直線 向下平移,得到過點(diǎn)的直線,且與軸負(fù)半軸交于點(diǎn)取點(diǎn),連接 ,求證::點(diǎn)是線段 上一動(dòng)點(diǎn),點(diǎn)是線段上一動(dòng)點(diǎn),連接 ,線段 的延長線與線段交于點(diǎn)當(dāng)時(shí),是否存在點(diǎn)使得?若存在,求出點(diǎn)E的坐標(biāo);若不存在,請說明理由.1.C2.B3.A4.D5.B6.C7.B8.A9.D10.D11.A12.D13.14.x=15.16.17.18.1619.420.21(1)70~8077717373、727175797777,1090~100:92、95、92、94,4補(bǔ)全條形圖,如下:(2)74(3)根據(jù)題意,,150020022(1)由題意知:∠A=45°,∠NBC=15°,∠NBP=75°,過點(diǎn)B作BE⊥AP于點(diǎn)E,如圖,在Rt△ABE中,∠ABE=90°-45°=45°,∴AE=BE,∵,∴AE=BE=3,在Rt△BEP中,∠EBP=180°-∠ABE-∠NBP=60°,∴PE=,∴AP=AE+PE=;(2)∵BE=3,∠BEP=90°,∠EBP=60°,∴BP=,又∵∠CBP=∠NBP-∠NBC=75°-15°=60°,BC=6,∴△BCP是等邊三角形,∴CP=BP=6.23(1)ABxy根據(jù)題意可得,解得,∴A種商品和B種商品的銷售單價(jià)分別為140元和180元.(2)設(shè)購進(jìn)A商品m件,則購進(jìn)B商品件,根據(jù)題意可得:,解得:,令總利潤為w,則,,∴當(dāng)時(shí),獲得利潤最大,此時(shí),∴A20,B40(1)EEH⊥OC,OC∵直線l為的切線,A是切點(diǎn),∴OA⊥AE,∵OC⊥AB,∴∠EHO=∠OAE=∠AOH=90°,∴四邊形AOHE是矩形,∴EH=OA=3,AE=OH,∵,∴,∴AE=OH=CH-OC=2;(2)∵∠OAE=∠AOC=90°,∴OC∥AE,∴△ADE∽△OCD,∴,∴AD=1.2,OD=1.8,∵,∴BF=2,∴OF=1,∴AF=4,CF=,連接BG,∵∠ACF=∠B,∠AFC=∠GFB,∴△AFC∽△GFB,∴,∴∴,,∴CG=CF+GF= ,設(shè)CO延長線交于點(diǎn)N,連接GN,則∠CNG=∠CAG,在Rt△CGN中,∠CGN=90°,CN=6,CG=,∴NG= ,∴cos∠CAG=cos∠CNG=.25(1)①∵繞點(diǎn)C按順時(shí)針方向旋轉(zhuǎn)得到,∴∠A=∠A′,∵∴∠ACA′=∠A′,∴∠ACA′=∠A,∴AD=CD,∵∠ACD+∠BCD=90°,∠A+∠ABC=90°∴∠BCD=∠ABC∴BD=CD∴AD=BD,②∵∠BCD=∠ABC=∠CEM,∠ACB=∠BEC=∠EMC=90°∴△ACB∽△BEC∽△CME,BC=2,AC=4∴CE=x,Rt△CEB則解得即,BE=同理可得:EM=∴S△BEC=S△ACE=S△ABC=S△ABE=S△ABC-S△ACE-S△BEC∴=(2)Rt△ABC,BC=2,AC=4,AB=∴解得:CD=∵∠A=∠BCD,∠ADC=∠BDC∴△ADC∽△BDC∴CD2=BD·AD即解得:AD=∵DM∥A′B′∴∠A′=∠CDM,∠A′CB′=∠DAN∴△CDN∽△CA′B′∴,即∵∠ADC=∠A′CB′=90°∴CN∥AB∴∴∴26(1)∵=,∴頂點(diǎn)M的坐標(biāo)為(3,-3).令中y=0,得x1=0,x2=6,∴A(6,0,將點(diǎn)A的坐標(biāo)代入中,得-3+b=0,∴b=3;∵ 由平移得來,∴m=-,∵過點(diǎn)M(3,-3),∴,解得n=,∴平移后的直線CM的解析式為y=-x.過點(diǎn)D作DH⊥直線y=-x,∴設(shè)直線DH的解析式為y=2x+k,將點(diǎn)D(2,0)的坐標(biāo)代入,得4+k=0,∴k=-4,∴直線DH的解析式為y=2x-4.解方程組 ,得 ,∴H(1,-2).∵D(2,0),H(1,-2),∴DH=,∵M(jìn)(3,-3),D(2,0),∴DM=,∴sin∠DMH=,∴∠DMH=45°,∵∠ACM+∠DMH=∠ADM,∴;E,過點(diǎn)G作GP⊥x軸,過點(diǎn)E作EQ⊥x軸,∵A(6,0),B(0,3),∴AB=.∵,∠BEF=∠BAO+∠AFE,∴∠BAO=∠AFE,∴AE=EF,∵,∴,設(shè)GF=4a,則AE=EF=3a,∵EQ⊥x軸,∴EQ∥OB,∴△AEQ∽△ABO,∴ ,∴ ,∴AQ=a,∴AF=a.∵∠AFE=∠PFG,∴△FGP∽△AEQ,∴,∴FP=a,∴OP=PG=,∴+a+a=6,解得a=,∴AQ=,∴OQ=,將x=代入中,得y=,∴當(dāng)時(shí),存在點(diǎn)E,使得,此時(shí)點(diǎn)E的坐標(biāo)為( , ).一、單選題

內(nèi)蒙古包頭市2020年中考物理試卷下列說法正確的是( )A.?dāng)U散現(xiàn)象只發(fā)生在氣體之B.色拉油加熱后比熱容變大C.夏天在地面上灑水會感到?jīng)隹?,是因?yàn)樗舭l(fā)吸熱D.內(nèi)燃機(jī)的做功沖程,機(jī)械能轉(zhuǎn)化為內(nèi)能下列說法正確的是( )B.日環(huán)食是由光的折射形成的C.當(dāng)入射光線與平面鏡的夾角為30°時(shí),反射角為30°D.在電影院,坐在不同座位都能觀賞電影場景,是由于銀幕對光線產(chǎn)生鏡面反射踢毽子是一項(xiàng)有益的體有活動(dòng)小軍以某一速度將毽子豎直向上踢出,下列說法正確的是( A.腳對毽子的力大于毽子對腳的力B.毽子離開腳后繼續(xù)向上運(yùn)動(dòng),是因?yàn)榫哂袘T性C.毽子離開腳時(shí)的速度與落回到該位置時(shí)的速度大小相等D.毽子上升過程中重力勢能不變下列說法正確的是( )B.C.如圖丙,手搖發(fā)電機(jī)轉(zhuǎn)動(dòng)線圈,可以產(chǎn)生大小?方向不變的直流電D.如圖丁,洗衣機(jī)的電源插頭有三根線,其中標(biāo)“E”的導(dǎo)線和金屬外殼相5.下列敘述錯(cuò)誤的是( )?C.99.86%,所以太陽的密度遠(yuǎn)遠(yuǎn)大于地球的密度D.現(xiàn)在開采的煤,石油等化石能源,實(shí)際上都源于上億年前的太陽能10NF(不計(jì)滑輪重力)B塊A在粗糙木板B上水平向左做勻速直線運(yùn)動(dòng),5s內(nèi)木塊A移動(dòng)了0.5m,滑輪組的機(jī)械效率為80%?列說法正確的是( )A5NB4N5sB2JF0.5W0.2A,率為0.4W。移動(dòng)滑片,將滑動(dòng)變阻器最大阻值的接入電路時(shí),電流表示數(shù)為0.4A,小燈泡恰好正2W。下列說法正確的是()8V小燈泡正常發(fā)光時(shí)電阻為C.滑動(dòng)變阻器的最大阻值D.小燈泡正常發(fā)光時(shí),滑動(dòng)變阻器消耗的功為4.8W二、實(shí)驗(yàn)題某同學(xué)用光具座?凸透鏡?蠟燭,光屏和度尺等實(shí)驗(yàn)器材,探究“凸透鏡成像的規(guī)律”?為了測量凸透鏡的焦距,讓一束平行于主光軸的光射向凸透鏡,移動(dòng)光屏,直到光屏上出現(xiàn)小,最亮的光斑,用刻度尺測出光斑到凸透鏡中心的距離,如圖甲所示,凸透鏡焦距為 cm;將凸透鏡固定在光具座50cm刻度線處蠟燭放置在光具座40m刻度線處點(diǎn)燃蠟燭左右移光屏,出現(xiàn)圖乙所示現(xiàn)象(成像清晰)?為使像呈現(xiàn)在光屏中央,應(yīng)將光屏向 調(diào)節(jié);保持凸透鏡位置不變,調(diào)整燭焰中心?透鏡中心和光屏中心在同一高度,將蠟燭移至34cm刻度線處,移動(dòng)光屏?直到光屏上再次出現(xiàn)清晰的像,該像是倒立 的實(shí)像,保持凸透鏡位置不變將蠟燭續(xù)向左移動(dòng)10.0cm,仍要在光屏上得到清晰的像,光屏應(yīng)向 移動(dòng)一段距離?1min并觀察物質(zhì)的狀態(tài),根據(jù)實(shí)驗(yàn)數(shù)據(jù),繪制出該物質(zhì)熔化時(shí)溫度隨時(shí)間變化的圖像,如圖乙?由圖乙可知該物質(zhì)是 (“晶體“非晶體判斷依據(jù)是 圖乙中AB段,該物質(zhì)處于 態(tài)?若實(shí)驗(yàn)過程中燃燒了8g酒精,8g酒精完全燃燒放出的熱量為 酒精熱值)約為,滑動(dòng)變阻器的規(guī)格為“1A”?圖甲是某實(shí)驗(yàn)小組未連接完整的實(shí)驗(yàn)電路?請用筆畫線代替導(dǎo)線,將圖甲中的電路連接完整,導(dǎo)線不能交叉??小組成員找來一個(gè)兩端接有導(dǎo)線的定值電阻值為一端接在電源負(fù)極接線柱上另一端依次觸碰接線柱AB?C,C?排除故障后閉合開關(guān)移動(dòng)滑片使電壓表示數(shù)為 小燈泡正常發(fā)光?電流表示如圖乙所示,則小燈泡的額定功率為 W?某同學(xué)想利用該電路“測量定值電阻的阻值,于是取下小燈泡,將電阻接入小燈泡據(jù)如下表∶由數(shù)據(jù)可得,電阻的阻值為 ;能否將阻值約為的電阻接入圖甲中小燈泡所在位置(其他連接均不變)測量其阻值,你的判斷是 ,理由是 ??特制容器底部是一個(gè)壓敏電阻厚度不計(jì)通過導(dǎo)線與電路相連電壓恒為定值電阻電流表的量程,R保持水平?(,g取10N/kg)閉合開關(guān)電流表示數(shù)為0.08A緩慢向容器內(nèi)注水電流表示數(shù) “變大“小不變注入深度為50cm的水時(shí)水對壓敏電阻的壓強(qiáng) Pa電流表示數(shù)為 ?斷開開關(guān)將水倒出擦干容器置于水平操作臺上注入深度為50cm的待測液體閉合開關(guān)電流表示數(shù)為0.24A,則待測液體的密度 的密度,該液體的密度是 ?若注入待測液體時(shí)俯視讀數(shù),該液體密度的測量值 真實(shí)值三、計(jì)算題小宇家購置一款用來煎烤食物的雙面電餅鐺,上下盤既可以同時(shí)加熱?也可以把上盤掀開,使用下S1S2接接線柱“2”熱S3S2自動(dòng)轉(zhuǎn)接接線柱“1(忽略溫度對電阻值的影響∶L1、L2、L3耗的電能)求∶R1的阻值和保溫時(shí)電路中的額定電流;L1,L210min5min,的電能是多少

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