山东省济南市长清区2020-2021学年八年级下学期期末英语试题（含听力）

八年级阶段检测英语试题本试题分第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分，共10页，满分150分。考试时间为120分钟。答卷前，请考生务必将自己的姓名、座号和准考证号填写在答题卡上，并同时将考点、姓名、准考证号和座号填写在试卷规定的位置。考试结束后，将本试卷和答题卡一并交回。选择题部分共105分注意事项：每小题选出答案后，用2B铅笔把答题卡上对应题目的答案标号涂黑；如需改动，用橡皮擦干净后，再选涂其他答案标号。Ⅰ.听力测试（30分）A）听录音，在每组句子中选出一个你所听到的句子。每个句子听一遍。1.【此处可播放相关音频，请去附件查看】A.Heisthemaincharacter.B.It’smucholder.C.Wecantakethebus.【答案】A2.【此处可播放相关音频，请去附件查看】A.Thisisareallyoldbook.B.I’veseenitthreetimes.C.It’ssocold.【答案】B3.【此处可播放相关音频，请去附件查看】A.Haveyoureadthebook?B.Couldyoupleasesweepthefloor?C.Areyoukidding?【答案】A4.【此处可播放相关音频，请去附件查看】A.Whynottalktoyourparents?B.What’sthematter?C.Howdoesitbegin?【答案】C5.【此处可播放相关音频，请去附件查看】学科网（北京）股份有限公司 A.Let’sgotomorrow.B.Youshouldhavearest.C.It’sfantastic.【答案】BB）在录音中，你将听到五段对话，每段对话后有一个小题，从每小题A、B、C中选出能回答所给问题的正确答案。每段对话听两遍。6.【此处可播放相关音频，请去附件查看】What’sPeter’sfavoritestory?A.SleepingBeauty.B.CinderellaC.JourneytotheWest.【答案】C7.【此处可播放相关音频，请去附件查看】HowlongistheGreatWall?A.About6300km.B.About8850km.C.About5464km.【答案】B8.此处可播放相关音频，请去附件查看】WhendidTomgotothespacemuseum?A.Thisyear.B.Lastyear.C.Twoyearsago.【答案】B9.【此处可播放相关音频，请去附件查看】Whatwastheboydoing?A.Ridingabike.B.Visitingalibrary.C.Waitingforabus.【答案】C10.【此处可播放相关音频，请去附件查看】Whoalsolikescountrymusic?A.Mike’sfriend.B.Mike’sbrother.C.Mike’sfather.【答案】BC）在录音中，你将听到一段对话，对话后有五个小题，从每小题A、B、C中选出能回答所给问题的正确答案。对话听两遍。（听对话前，你将有40秒钟的读题时间：听完后，你将有40秒钟的答题时间）【此处可播放相关音频，请去附件查看】11.WhatisBillbusywiththesedays?学科网（北京）股份有限公司 A.Vacation.B.Exam.C.Books.12.WhatisSallygoingtodo?A.Gocamping.B.Readbooks.C.Shehasn’tdecided.13.HowdoesSallylikethebook?A.Peaceful.B.Boring.C.Wonderful.14.WherecanSallygetthebook?A.Theschoollibrary.B.Themuseum.C.Thelake.15.Whowillgocamping?A.Bill.B.Lily.C.BillandLily.【答案】11.B12.B13.C14.A15.CD）在录音中，你将听到一篇短文，短文后有五个小题，从每小题A、B、C中选出能回答所给问题的正确答案。短文听两遍。（听短文前，你将有40秒钟的读题时间：听完后，你将有40秒钟的答题时间）【此处可播放相关音频，请去附件查看】16.WhendidtheGreensgotothecinema?A.LastThursday.B.LastSaturday.C.LastSunday.17.Didtheylikethefilm?A.Yes.B.No.C.Wedon’tknow.18.Whattimedidtheyfinishseeingthefilm?A13.B.12.C.11.19.HowdidtheGreensgethome?A.Bycar.B.Bybus.C.Bysubway.20.Whowilldothedishes?A.Theearlierone.B.Thelaterone.C.Thehappierone.【答案】16.B17.A18.C19.A20.BⅡ.选择填空从每题A、B、C、D四个选项中，选出一个最佳答案。（15分）21.—Whatdoyouthinkabout________storyofYuGong?—Ithinkit’sreallyinteresting.A.aB.anC.theD./学科网（北京）股份有限公司 【答案】C22.Ourhometownhasleftmanysoftandsweetmemoriesin________hearts.A.weB.usC.oursD.our【答案】D23.—Ihaveasorethroat.—Youshoulddrinkmore________.A.riceB.carrotC.waterD.beef【答案】C24.—Let’sgototheamusementparkaftertheexams!—________goodidea!AWhatB.WhataC.HowD.Howa【答案】B25.—HaveyouboughtforLinda’sbirthday?—Notexactly.Justsomeflowers.A.somethingunusualB.anythingunusualC.unusualsomethingD.unusualanything【答案】B26.—HaveyoubeentotheGreatWall?—SureIhave!Iwentthere3yearsago,with________visitorsaround.A.thousandB.thousandsC.thousandofD.thousandsof【答案】D27.—Whydidthecarhitthegirl?—Becausethedriver________onthephoneatthattime.A.istalkingB.wastalkingC.talkedD.havetalked【答案】B28.—LiMei’s________isverybeautiful.—Yes.Hersongssoundverynice.A.noiseB.voiceC.lookD.smile【答案】B29.Helenhasgottwobrothers._____ofthemlikeschocolate,butshelovesit.A.NeitherB.NoneC.EachD.Any学科网（北京）股份有限公司 【答案】A30.—Whendoesyoursonusually________inthemorning?—Atabout6:30.A.setupB.wakeupC.takeupD.giveup【答案】B31.—TheQiGreatWallinJinanis________GreatWallinChina.—Yes,andit’s500years________thantheQinWall.A.older;olderB.oldest;olderC.theoldest;olderD.theoldest;theolder【答案】C32.—Thankyouforbeingso________withme!—Youhaverighttoknowthetruth.A.niceB.kindC.honestD.strict【答案】C33.—Whosewatchisthis?—It_________David.Heboughtityesterday.A.dependsonB.takesinC.givesupD.belongsto【答案】D34.—TheboycanspeakbothEnglishandJapanese________heisonlyten.—Wow,heissoclever.A.ifB.becauseC.althoughD.until【答案】C35.—Howlonghaveyou________?—Since15yearsago.A.boughtthecameraB.hadthebikeC.becomeateacherD.borrowed【答案】BⅢ.完形填空阅读短文，从每题A,B,C,D四个选项中，选出一个能填入文章中相应空白处的最佳答案。Mr.Blackwasonceapoliceman.Hewasa____36____person.Helikedtohavea____37____intheparkafterbreakfast.Itwasverycold____38____awintermorning.Mr.Blackwaswalkingalongthestreetwhenheheardacryfor____39____.Heturnedaroundbutcouldsee____40____.Hestoppedandlookedhereandthere.Atthe学科网（北京）股份有限公司 moment,aboy____41____tohim.Theboywasinsuchahurry____42____hecouldn’tsayawordexceptpointingtowardstheriver.Mr.Blackrealizedwhathadhappenedand____43____totheriverassoonaspossible.____44____ofthemranalongtheriverandsawagirlinthewater.She____45____apieceofwood.Itwascarryingheraway.Itwastoo____46____.Withoutaword,Mr.Blacktookoffhisclothesas____47____ashecould,andjumpedintotheriver.He____48____tothegirlandtookherbacknearthebankandliftedthegirlup,andthentheboyhelped____49____heroutofthewater.Thentheystoppedacarandtookthegirltothe____50____.Atlastthegirl’slifewassaved,andshethankedthemverymuch.36.A.usualB.kindC.uglyD.polite37.A.jumpB.runC.goD.walk38.A.inB.onC.atD.for39.A.helpB.moneyC.foodD.life40.A.somebodyB.someoneC.nobodyD.nothing41.A.walkedupB.lookedupC.setupD.ranup42.A.soB.andC.thatD.but43.A.walkedB.droveC.swamD.ran44.A.AllB.BothC.NeitherD.either45.A.washoldingB.wasliftingC.istakingD.ispushing46.A.heavyB.excitingC.dangerousD.interesting47.A.slowlyB.carefullyC.quicklyD.quietly48.A.swamB.ranC.flewD.walked49.A.pushB.pullC.bringD.take50.A.houseB.schoolC.parkD.hospital【答案】36.B37.D38.B39.A40.C41.D42.C43.D44.B45.A46.C47.C48.A49.B50.DⅣ.补全对话阅读对话，从每题A、B、C、D四个选项中，选出一个最佳答案完成对话Susan:Hey,Alice!Alice:Hi,Susan!_____51_____Susan:Ireadbooks.Ioftenreadfairytales(童话故事).Alice:_____52_____学科网（北京）股份有限公司 Susan:Becausetheyareinterestingandmeaningful.IreadthestorySnowWhitelastweek.Alice:Doyoulikeit?Susan:Yes,ofcourse._____53_____Iwanttoreaditagain.Alice:_____54_____Susan:ItisaboutabeautifulgirlcalledSnowWhite.Herstepmotherwantedtokillherbecausethegirlwasverybeautiful.Luckily,thesevendwarfs(小矮人)savedher.Alice:Whathappenedtoherintheend?Susan:Shemetaprince.Shemarriedhimandtheyhadahappylife.Alice:Great!_____55_____51.A.What’swrongwithyou?B.Whatdoyouusuallydoinyourfreetime?C.Whatdoyouthinkofthebook?D.Wheredidyougoyesterday?52.A.Didyougotoschool?B.Whydoyoulikefairytales?C.Whatdidyoudothen?D.Howdidyougotothepark?53.A.It’smyfavoritestory.B.MyfavoritesubjectisscienceC.IhavebeentoJinan.D.Iarrivedtherethreedaysago54.A.Howfarisitfromthestation?B.Whendidyougothere?C.Whatisitabout?D.Howdidyougetthere?55.A.Whatagoodending!B.Howterrible!C.Seeyoulater!D.Sure!【答案】51.B52.B53.A54.C55.AⅤ.阅读理解阅读下列短文，从每题A、B、C、D四个选项中，选出一个能回答所提问题完成所给句子的最佳答案。（40分）AMrs.Readlivesinthecountryside.Sheisveryhappy.Sometimessheisnothappy.Therearen’tmanythingstobuyinthecountryside.Sheneedstogotothecity.Onedayshegoestothecity.Firstshebuyssomefruitand学科网（北京）股份有限公司 vegetablesforherselfandforherfriend.Thenshegoesintoashop.Shewantstobuyapairofglasses.Shetriesonepair,andthenanother,andanother.butnoneofthemseemstofeelright.Theshopkeeperisaniceman.AftersometimehesaystoMrs.Read,“Don’tworry,madam.Everythingwillbeallrightintheend.Itisn’teasytofindtherightglasses.”“No,itisn’t,”answersMrs.Read.“Anditisevenmoredifficultwhenyouareshoppingforafriend.”56.WhydoesMrs.Readgotothecity?A.Shelovesthecity.B.Sheneedstobuysomethings.C.Sheneedstoseeadoctor.D.Tovisitafriend.57.Mrs.Readbuys________whenshegetstothecity.A.fruitandvegetablesB.somevegetablesC.nothingD.somefruit58.Thenshegoesintoashoptobuyapairof________.A.jeansB.shoesC.trousersD.glasses59.ItisnoteasyforMrs.Readto________.A.talktotheshopkeeperB.findtherightglassesC.buyglassesD.findtheshop60.Theglassesarereallyfor________.A.Mrs.ReadherselfB.herfriendC.hersonD.herstudent【答案】56.B57.A58.D59.B60.BBTherewasonceamanwhokepttenmonkeysaspetsashewasveryfond(喜爱)ofthem.Everymorningthemonkeyswouldclimbupanddownthetreesorjumpfromonebranch(树枝)toanotherinhisbackyard.Afterthat,hewouldfeedthembananas.Onemorningthemansaidtothemonkeys,“Wehaveveryfewbananaslefttoday.ForbreakfastIshallgiveeachofyoutwobananasandfourfordinner.”Whenthemonkeysheardthis,theylookedveryunhappy.Theyrefused(拒绝)totakethebananasthatthemanwashandingouttothem.“Verywell,then.Youshallhavefourbananasinthemorningandtwofordinner.”themansaid.Themonkeyslookedatoneanother.Thentheyjumpedupanddownhappily,noddingtheirheads,Theytookthebigandyellowbananasfromthemanandstartedeating.61.Themankeptthemonkeysbecausehe________.A.likedthemB.soldmonkeysaspetsC.wantedthemtoworkforhimD.hadmanybananatreesinhisbackyard62.Themanfedthemonkeys________.学科网（北京）股份有限公司 A.twiceadayB.intheafternoonC.onlywhentheywerehungryD.beforetheyclimbedupanddownthetrees63.Atfirstthemanwantedtogivethemonkeys________bananasfordinner.A.oneB.twoC.threeD.four64.Themonkeyswereunhappyandthey________.A.ranawayB.noddedtheirheadsC.didn’ttakethebananasD.jumpedupanddown65.Finally,themonkeysate________bananasforthewholeday.A.lessB.moreC.fiveD.thesamenumberof【答案】61.A62.A63.D64.C65.DCTherearemanyplacesintheworldwhichareshortoffreshwater.Somanycountriesaretryingtofindwaystoturnseawaterintofreshwater.Peoplebuildmanyfactoriestomakesaltwaterintofresh.Insomeplaces,peopleusesomewaystoheat(加热)seawater.Thesewayswillturnsaltwaterintofreshwater,butthesewayscostmuchmoney.Sometimes,peopleboil(煮沸)seawaterwithhighheat,thenalotoffreshwatercanbemadequickly.However,heatingisnottheonlywaytogetfreshwaterfromsaltwater.Otherwaysaretried.Onewayisfreezing.Thefreshpartofsaltwaterfreezesfirst.Togetfreshwater,thepiecesoficearetakenout.Whichwayisbest?Theonethatgivesthemostwaterfortheleastmoney.Itmaybeadifferentwayforeachplace.Heatingseemsverygoodforsmall,hotplaces.Itdoesn’tmakeverymuchwateratatimeandthequality(质量)offreshwaterisnotsogood.Butthefactoryiseasytobuildandcostslittle.That’swhypeopleinmanydryplacesstillusethisway!66.Whydomanycountriestrytoturnsaltwaterintofreshwater?A.Peoplelikefreshwater.B.Peopledon’tlikesalt.C.Theyareshortoffreshwater.D.Theyareshortofsaltwater.67.Howdopeoplegetfreshwater?A.Cutwoods.B.Cookfreshmeat.C.Buildhighbuildings.D.Boilseawaterwithhighheat.68.Whichisthebestwayforsmallandhotplacestogetfreshwater?A.Makingwishes.B.Drawingtheseaandsky.C.Boilingorheatingtheseawater.D.Freezingtheseawaterincoldplaces.学科网（北京）股份有限公司 69.Whatdoesthepassagemainlytalkabout?A.Hotplacesanddryplaces.B.Waterfactoriesindifferentcountries.C.Howtomakegooduseofthesunlight.D.Thewaysofmakingfreshwaterfromseawater.70.WhichofthefollowingisTRUE?A.Peoplearetryingtogetfreshwater.B.Waterfactoriesdon’tworkindryplaces.C.Alotoffreshwatercanbemadequicklybyheating.D.Thebestwayistogettheleastfreshwaterwiththemostmoney.【答案】66.C67.D68.C69.D70.ADPoverty(贫困)isabigproblemaroundtheworld.ButChinahasdoneagoodjobofdealingwithitandithasfounditsownwaytofightpoverty.Insteadofjustgivingmoneytopoorpeople,ithastriedtoeducatepeopleandgivethemthetoolstheyneedtoliftthemselvesoutofpoverty.Ordinarypeopleplayabigroleinthefight.Herearetwoofthem.ZhangGuimeihasbeenhelpinggirlspursue(追求)educationsinceshetraveledtoYunnanattheageof17.Asateacher,Zhangwasheartbrokenwhenshesawherstudentsquitschoolafterfinishingseniorhighschool.Theycouldn’tgotocollegebecausetheirfamiliescouldn’taffordit.Soin2008,Zhangstartedafreeschoolforpoorgirls.Sincethen,Zhanghasbeenbusyaskingfordonationstoprovidemoneyfortheschool.Shehasconvinced(说服)parentstosendtheirdaughtersbacktoschool.Theschoolhassentmorethan1,800studentstouniversitiesandcolleges.WhenMaoXianglinstartedtoworkasthePartysecretaryofhisvillage,therewasonlyonepathwayoutof学科网（北京）股份有限公司 thevillageformanyyears.Heledmorethan100villagerstobuildaroadwiththeirhands.Ittookthemsevenyearstobuildaneight-kilometerroad.Maothenencouragedthevillagerstogroworanges.Lastyear,theirorangeyield(产量)wasnearly40tons.Youngpeoplehavereturnedtothevillagetosellorangesonline.Bytheendof2019,269villagershadbeenliftedoutofpoverty.Thepercapitaincome(人均收入)reached12,670yuan,40timesmorethaninthe1990s.Overthelasteightyears,98.99millionruralpeoplehavebeenliftedoutofpoverty.The832counties(县)and128,000villageswhichthesepeopleliveinarenolongerinpoverty.Chinahasbeenresponsibleforreducing70percentofpovertyworldwidesincethelate1970s.71.Whatdoestheunderlinedword“quit”meaninParagraph2?A.leaveB.serveC.dislikeD.build72.WhatdoyouknowaboutMaoXianglinaccordingtothetext?A.Heworksasateacherinthevillage.B.Hedidtwothingstohelpthevillagers.C.Heencouragedthevillagerstoselloranges.D.Heledvillagerstobuildaroadwithsometools.73.What’stherightstructure(结构)ofthetext?①-Paragraph1②-Paragraph2③-Paragraph3④-Paragraph4A.B.C.D.74.Whatisthepurposeofusingthenumbersinthelastparagraph?A.Topraisethespiritsofmodelworkers.B.Toshowgreatachievementsagainstpoverty.C.Tospreadthewaysoffightingagainstpoverty.D.Todescribetheexperiencesoffightingagainstpoverty.75.WhichofthefollowingisTRUEaccordingtothetext?A.Theteacherhelpedthepoorareasoutofpovertybygivingmaterials.B.Thepercapitaincomeinthevillagewasmorethan¥500inthe1990s.C.Theyoungpeoplewhostayedinthevillagegreworangesinthepast.D.ZhangGuimeihasbeenhelpinggirlspursueeducationforover40years.学科网（北京）股份有限公司 【答案】71.A72.B73.B74.B75.D非选择题部分共45分Ⅵ.选词填空。（10分）A.阅读短文，从方框中选择适当的单词填空（每词限用一次）。bicyclesfriendlybutnewsaboutDearSharon,I’msorrythatIhaven’twrittenforsolong.Youknowwe’vebeenhereforaboutsixweeks,____76____Ihaven’tgotusedtoityet.Shanghaiisabigcityfullofpeopleand____77____high-risebuildingsandsmalltraditionalshops.MomandIhavebeentothestreetmarketacoupleoftimes.Peopleherearekindand____78____andChinesefoodisreallygreat.Yousee,Iliketheplaceandthelifestylehere,butIstillmissRome.Whataboutyou?Whatareyouupto?IsschoolOK?Andhowaboutourfriends?Makesureyouwritetomeandtellmeeverything____79____everybody.Iwanttocatchupwithallyourlatest____80____.Marion【答案】76.but77.bicycles78.friendly79.about80.newsB.askwalkbemakeregardAmotheroftentakesawalkwithherfifteen-year-oldson.Butrecentlyshefoundthingschanged.Theyoungmanalwayskeptaloneinfrontofherwhilethey____81____togetheronthestreet.Shethoughthedidn’tloveheranymore.Oneday,themothercouldn’tstop____82____herson,“Tommy,doyoufeelshamed(羞耻的)whenwewalktogetheronthestreet?Ifthat____83____true,I’llneveraskyoutowalkwithmeagain.”“Oh,no,Mom!Youmisunderstood(误会)me!”saidtheyoungboywithashysmile.“I84.____84____youasthebestMomintheworldeversinceIwasyoung.Ididn’twalktogetherwithyoubecause...myfriendssawusonedayandthoughtthatI____85____anewgirlfriend!”【答案】81.werewalking学科网（北京）股份有限公司 82.asking83.is84.haveregarded85.madeⅦ.阅读理解七选五请先阅读下面短文，然后根据短文内容从下面方框内的七个选项中选择五个还原到文中，使短文意思通顺、结构完整。Trafficsafetytipsaresomethingthatisnotjustforkids!Rememberthatmostaccidentshappenbecauseofadults!Weshouldremembersometrafficsafetydosanddon’ts,andthisarticlewillhelpyoudoexactlythose!___86___Rememberwhenyouaredrivingacarwithyourkidssittingnexttoyou,theyarewatchinghowyoudrive.Ifyoudon’tfollowtrafficrulestoday,theywon’ttomorrow.So,youmustmakesurethatyoufollowallthenecessarytrafficrulestosetagoodexample.Thefirstthingthatyouaresupposedtodo,andmakesurethatothersinthecaralsodo,istoputyourseatbelton.___87___Ifthereisachildinthecarbetweentheageof4and8,aboosterseat(儿童座椅)shouldbeused.Kidsundertheageof12shouldneversitonthefrontseat.Doyoulistentomusic,eatyoursandwichandspeakonthephonewhenyoudrive?___88___Onceyouaredriving,whetheryouarealoneorwithyourfriendsandfamily,youareresponsibleforeveryoneinthecar.Drivingunderpressurewithyourmindfilledwithproblemsatworkorathomewouldeasilyallowyoutodrawyourmindofftheroadcausinganaccident.Somakesurethatyouletthethingsoutsideyourcarwhenyouareinthecar.___89___Sotheseweresomeofthemaintrafficsafetytipsthatshouldbefollowedbyoneandallinordertostaysafeandbeanexampleforothers.Remember,rulesandregulationsaremadeforyourownsafety.___90___Takecareandhaveasaferide.A.Sleepproperlyandstayrelaxedbeforehittingtheroad.B.Sopleasewearyourseatbelt.C.Beinganadult,itisyourdutytosetagoodexampleforothers.D.Somakesurethatyoushouldfollowthem.EItisforthemtokeepsafe.F.Weshouldn’tmakephonecallswhenyouaredriving.G.Ifyoudothis,youareallowingotherthingstodrawawayyourattention.【答案】86.C87.E88.G89.A90.D学科网（北京）股份有限公司 Ⅷ.书面表达（30分）情境运用根据所提供的图片，用完整的句子提问或应答。1234591.—Whatwasyourbrotherdoingwhenyoudidyourhomeworklastnight?—_____________________________________________________________.92.—_____________________________________________________________?—Hehashaditforthreeyears.93.—_____________________________________________________________?（用关键词ever，beach）—Yes,Ihave.94.—_____________________________________________________________?—ThepopulationofChinais1,400,050,000.95._____________________________________________________________.（根据图片信息，用关键词longest，China写出一句完整的话）【答案】91.He/Mybrotherwassweepingthefloor.92.Howlonghashehadthebik93.Haveyoueverbeentothebeach(es)94.WhatisthepopulationofChina95.TheGreatWallisthelongestwallinChinaB英语写作（20分）96.杂交水稻之父袁隆平院士、中国肝胆外科之父吴孟超院士离开了我们，但他们敢于梦想、艰苦奋斗的精神时刻鼓励国人。作为祖国未来，我们更应努力奋斗，但奋斗的道路不会一帆风顺，我们每个人在生活和学习上都会遇到这样那样的困难。你遇到困难时是怎样解决的呢？请以“Howtogetover（克服）difficulty”为题写一篇英语短文。1.要点：①你遇到了什么困难；②你是怎样克服困难的；③你的感受。2.要求：①文中不得出现真实姓名和学校名称；②100词左右。学科网（北京）股份有限公司 ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________【答案】例文HowtogetoverdifficultyInourdailylife,weoftenmeetdifferentkindsofdifficulties.Buthowcanwegetoverthem?Hereisoneofmyexperiences.WhenIwasinGrade7,Ididn’tdowellinmylessonsfirst.Examsalwaysbroughtmeendlesssadness.Asaresult,IwasafraidofstudyandIbecameverylonely.Iturnedtomyteachersforhelp,andtheygavemesomeusefuladvice.Theytoldmenottogiveupbecausenothingisimpossibleforawillingheart.Iwasmovedandworkedharderandharderthanbefore.Finally,Isucceeded.NowIunderstandthatIshouldlearntogetoverdifficultybymyselfwithconfidenceandhardwork.学科网（北京）股份有限公司 学科网（北京）股份有限公司