九年級(jí)英語(yǔ)全冊(cè)UnitWhenwasitinvented檢測(cè)卷新版人教新目標(biāo)版

PAGEPAGE9Unit6Whenwasitinvented?總分值100分,限時(shí)60分鐘Ⅰ.單項(xiàng)選擇(每題1分,共15分)1.isoneofthefourgreatinventionsofancientChina.

A.Thecar B.ThetrainC.Paper-making D.Thecomputer1.答案C句意:造紙術(shù)是中國(guó)古代的四大創(chuàng)造之一。由題干中的oneofthefourgreatinventions及對(duì)四大創(chuàng)造的了解可知答案為C項(xiàng)。2.mayhaveachancetobesuccessfulifhetrieshisbest.

A.None B.NobodyC.Somebody D.Everybody2.答案D結(jié)合此題語(yǔ)境可知,每個(gè)人都會(huì)有時(shí)機(jī)成功,如果他盡自己最大的努力。故everybody符合題意。3.Thissaladismadefruitsandit.

A.of;smellswellB.from;issmelledwellC.from;issmelledgoodD.of;smellsgood3.答案Dbemadeof表示“由……制成〞,表示從成品中能夠看出原材料;smell是感官動(dòng)詞,后跟形容詞作表語(yǔ)。故答案為D。4.Annietotheparty.Shehadawonderfultimewithus.

A.invites B.isinvitedC.wasinvited D.hasinvited4.答案C根據(jù)此題語(yǔ)境可知,Annie被邀請(qǐng)參加聚會(huì),主語(yǔ)是Annie,根據(jù)一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài)可知答案為C。5.—Thankyouforsupportingthevolunteerproject.—.Manyhandsmakelightwork.

A.Mypleasure B.AllrightC.Nevermind D.That'sright5.答案A句意:——謝謝你支持這個(gè)志愿者工程?！挥弥x。眾人拾柴火焰高。此題考查交際用語(yǔ)。四個(gè)選項(xiàng)中,只有“Mypleasure〞是對(duì)感謝的應(yīng)答。故答案為A。6.Coffeeisready.Howniceit!

A.smells B.sounds C.feels D.becomes6.答案Asmell聞起來(lái);sound聽(tīng)起來(lái);feel摸起來(lái);become變得。句意:咖啡好了。它聞起來(lái)真香啊!故所缺的詞是smells。7.TomLilyiscoming.

—Yeah,Iamsohappythattheyarefreetomorrow.A.Both;and B.Neither;norC.Either;or D.Notonly;butalso7.答案D根據(jù)答語(yǔ)可知,Tom和Lily兩人都有時(shí)間,故排除B、C兩項(xiàng)。又根據(jù)第一句中的is可知選D項(xiàng)。notonly...butalso連接主語(yǔ)時(shí),遵循就近一致原那么。8.—Allthevillagersthefightagainstthebigflood,youngandold,menandwomen.

—It'sreallybraveofthemtodoso.A.joined;including B.joinedin;includedC.joinedin;including D.joined;included8.答案Cjoininthefight參加戰(zhàn)斗,includingsb./sth.包括某人/某物在內(nèi)。9.—Whatdoyouthinkofthisfootballmatch?—I'venoidea.ButisbelievedthattheSpanishteamwillwin.

A.that B.this C.which D.it9.答案D由that引導(dǎo)的從句可知,這里缺少的是形式主語(yǔ)it。10.Iwon'tbelievethatthefive-year-oldboycanreadmagazinesItesthimmyself.

A.if B.but C.after D.until10.答案D考查固定結(jié)構(gòu)not...until,意為“直到……才……〞。11.Theyaremade14hoursaday.

A.work B.towork C.worked D.working11.答案Bmake用在被動(dòng)語(yǔ)態(tài)中時(shí),作補(bǔ)語(yǔ)的不定式不能省略to。12.Thenumberofteachersinourschool60andanumberofthemmaleteachers.

A.is;are B.are;is C.are;are D.is;is12.答案Athenumberof指的是“……的數(shù)目〞,謂語(yǔ)動(dòng)詞應(yīng)該用單數(shù)形式;anumberof意為“許多〞,謂語(yǔ)動(dòng)詞應(yīng)該用復(fù)數(shù)形式。13.Tom,youcangoouttoplayfootballafteryourhomework.

A.willfinish B.isfinishedC.wasfinished D.finishes13.答案B作業(yè)應(yīng)該是被完成,首先排除A和D;主句中有情態(tài)動(dòng)詞,after引導(dǎo)的時(shí)間狀語(yǔ)從句應(yīng)用一般現(xiàn)在時(shí)表將來(lái)。14.thesepastthreeyears,Iremembermanythings.

A.Lookingupto B.LookingoutC.Lookingbackat D.Lookingafter14.答案C此題考查look短語(yǔ)。lookupto尊敬,看得起;lookout留神;lookbackat回憶;lookafter照顧。結(jié)合此題語(yǔ)境可知,回憶這剛剛過(guò)去的三年,我記得許多事情,故答案為C。15.thewinterinHarbinisrathercold,thecityisstillattractivetothevisitorsthroughouttheworld.

A.AlthoughB.ButC.So15.答案A句意:盡管哈爾濱的冬天很冷,但這個(gè)城市對(duì)世界各地的游客仍然很有吸引力。此題考查連詞的用法,結(jié)合此題語(yǔ)境可知,although“盡管〞符合題意,故答案為A。Ⅱ.完形填空(每題2分,共20分)Howwouldyouusearadiooratelephoneifyouhadnoelectricityorbatteries?These16bothered(使煩惱)BritishinventorTrevorBaylis.Soin1996he17awind-up(裝有發(fā)條的)radio.Itdoesn'tneedelectricityorbatteries.Youwinditup18hand.Itplaysforaboutanhour.Then,youwinditup19.Todayit'Thenin1999,Baylisinventedamobiletelephonethatispoweredby20.Theshoescontain(含有)asmallbatterythatispoweredwhenyou21.Thisbatteryisconnectedtoamobilephone.Thesetwosimpleinventionscanbringmodern22toallpartsoftheworld.

Baylisdoesn'thaveauniversitydegreeinengineering.In23,helefthighschoolbeforegraduating(畢業(yè)).Hejustloves24thingstohelppeople.Heneverknows25ideaswillcometohim.Theideaforthetelephonecametohiminadream.

16.A.dreams B.problems C.wonders D.wishes17.A.invented B.improved C.borrowed D.copied18.A.in B.at C.on D.by B.slowly C.again D.finally20.A.sun B.shoes C.caps D.wind21.A.sleep B.walk C.rest D.chat22.Amunications B.exhibitionsC.suggestions D.instructions23.A.fact B.order C.need D.time24.A.buying B.selling C.making D.collecting25.A.while B.because C.unless D.when答案[語(yǔ)篇解讀]如果收音機(jī)或者沒(méi)電了,你會(huì)怎么辦呢?現(xiàn)在你不必為這些問(wèn)題煩惱了。因?yàn)橛?guó)創(chuàng)造家TrevorBaylis于1996年創(chuàng)造了一種裝有發(fā)條的收音機(jī),并在1999年創(chuàng)造了一種,你可以穿上特殊的鞋子邊走邊給電池充電?？岚?你想嘗試一下嗎?16.B收音機(jī)或沒(méi)電了就無(wú)法使用的問(wèn)題困擾著英國(guó)創(chuàng)造家TrevorBaylis。dream夢(mèng)想;problem問(wèn)題;wonder奇跡;wish愿望。此空與下文中的bothered(使煩惱)一詞相照應(yīng)。應(yīng)選B項(xiàng)。17.A根據(jù)前文的inventor一詞可知,他創(chuàng)造了一種裝有發(fā)條的收音機(jī)。invent創(chuàng)造;improve改良,改善;borrow借;copy抄寫(xiě),復(fù)制。根據(jù)句意可知選A項(xiàng)。18.D這種收音機(jī)靠手動(dòng)上發(fā)條。byhand手工,為固定搭配。應(yīng)選D項(xiàng)。19.C你給收音機(jī)上一次發(fā)條可以播放大約一個(gè)小時(shí),然后再上一次發(fā)條。then然后;slowly慢慢地;again再,又;finally最后。根據(jù)句意可知選C項(xiàng)。20.B根據(jù)下句Theshoescontain...可知,這種是由鞋子供電的。sun太陽(yáng);shoe鞋子;cap帽子;wind風(fēng)。應(yīng)選B項(xiàng)。21.B很顯然,鞋子是用來(lái)穿在腳上走路的。sleep睡覺(jué);walk步行;rest休息;chat聊天。應(yīng)選B項(xiàng)。22.A收音機(jī)和都是人們之間交流的工具。communication交流;exhibition展覽;suggestion建議;instruction教導(dǎo)。根據(jù)常識(shí)可知選A項(xiàng)。23.ABaylis沒(méi)有取得工程學(xué)的大學(xué)學(xué)位,事實(shí)上,他連高中都沒(méi)畢業(yè)。infact事實(shí)上;inorder井然有序;inneed生活困難;intime及時(shí)。其中只有infact可放在句首,后面用逗號(hào)隔開(kāi)。應(yīng)選A項(xiàng)。24.C作為一名創(chuàng)造家,Baylis喜歡制造東西來(lái)幫助人們。buy購(gòu)置;sell銷(xiāo)售;make制造;collect收集。根據(jù)語(yǔ)境可知選C項(xiàng)。25.D根據(jù)下一句可知,Baylis從不知道想法何時(shí)降臨。應(yīng)選D項(xiàng)。Ⅲ.閱讀理解(每題2分,共34分)ATous,itseemssonaturaltoputupanumbrellatokeepthewateroffwhenitrains.Butinfacttheumbrellawasnotinventedasprotectionagainsttherain.Itsfirstusewasasashade(遮蔽)againstthesun.Nobodyknowswhofirstinventedit,buttheumbrellawasusedinveryancienttimes.ProbablythefirsttouseitweretheChinese,backintheeleventhcenturyBC.WeknowthattheumbrellawasusedinancientEgyptandBabylonasasunshade.Andtherewasastrangethingconnectedwithitsuse:itbecameasymbolofhonorandpower(權(quán)力).IntheFarEastinancienttimes,theumbrellawasallowedtobeusedonlybythoseinhighofficeorbyroyalpeoplesuchasthekingsorqueens.InEurope,theGreekswerethefirsttousetheumbrellaasasunshade.TheumbrellawasincommonuseinancientGreece,butitisbelievedthatthefirstpeopleinEuropetousetheumbrellaasprotectionagainsttherainweretheancientRomans.DuringthemiddleagesinEurope,theuseoftheumbrellaalmostdisappeared.ThenitappearedagaininItalyinthelatesixteenthcentury.Andagainitbecameasymbolofpower.Umbrellashavenotchangedmuchinstyleduringallthistime,thoughtheyhavebecomemuchlighterinweight.Itwasn'tuntilthetwentiethcenturythattheumbrellasforwomenbegantobemadeinallkindsofcolors.26.Ancientpeoplefirstusedumbrellasas.

A.asymbolofhonor B.protectionagainstthesunC.asymbolofpower D.protectionagainsttherain27.Accordingtothepassage,theumbrellawasprobablyfirstusedinancient.

A.Egypt B.Babylon C.Rome D.China28.TheunderlinedwordroyalmightmeaninChinese.

A.皇室的 B.富裕的C.中產(chǎn)的 D.平民的29.Accordingtothepassage,whichofthefollowingisNOTtrue?A.TheancientGreeksusedtheumbrellaintheirdailylife.B.Europeanshardlyusedtheumbrelladuringthemiddleages.C.Theumbrellasforwomenweremadecolorfulinancienttimes.D.Thestyleoftheumbrellahasn'tchangedalotsinceitwasinvented.30.Thispassageismainlyabout.

A.thesalesoftheumbrellaB.thedifferencesamongumbrellasC.theinventionoftheumbrellaD.thehistoryandtheuseoftheumbrella答案[語(yǔ)篇解讀]本文是一篇說(shuō)明文,介紹了傘的用途及其開(kāi)展史。26.B細(xì)節(jié)理解題。由文章第一段的最后一句可知答案為B項(xiàng)。27.D細(xì)節(jié)理解題。文章的第二段第二句直接給出了答案。28.A詞義猜想題。由畫(huà)線(xiàn)單詞后的suchasthekingsorqueens可推知royal意為“皇室的〞,應(yīng)選A。29.C細(xì)節(jié)理解題。由最后一段的最后一句可知C項(xiàng)說(shuō)法錯(cuò)誤。30.D主旨大意題。整篇文章都在介紹傘的用途和開(kāi)展歷史,故D項(xiàng)正確。BInthepast200years,theearth'stemperaturehasincreasedgreatly.It'sreportedthatamarkedincreaseinthetemperatureofabout0.7℃appearedattheendoflastcentury.Somescientiststhinkmini-umbrellas(微型傘)mightreducetheglobal(全球的)temperature.Buildingasingleumbrella,whichisbigenoughtocoverthewholeearth,seemstobeimpossible.RogerAngel,ascientistfromtheUSA,hascarriedoutresearchtodealwiththisproblem.Hecameupwithanideaofmini-umbrellas.Infact,eachmini-umbrellaismadeupoftwoparts,aspaceshipandasunshade(遮陽(yáng)篷).Aspaceshipweighingabout1gwouldcarryasunshadethatishalfameterlong.Itwouldbemostlytransparent.Thatmeanslightcanpassitdirectlytoreachtheearth,withlandsandoceansclearlyinview.Pressure(壓力)fromthesunlightwouldkeepthelittlespaceshipsinpositionaroundtheearthatadistanceofabout1.5millionkilometers.Asaresult,sendingover1,000billionmini-umbrellasintospacewouldreducetheamountofsunlightreachingtheearth.Thisallowssunlighttobereflected(反射)backtospaceeasily,causingthetemperatureoftheearth'sgroundtofalloff.Coveringlargeareasoftheearth,mini-umbrellastogethercouldreflect1.8percentofsunlightback.InRoger'splan,scientistswillsendup800,000mini-umbrellasatatime,20milliontimesinallduringtenyears.Scientistssuggesttheearliestlaunchcouldbeinjust16years.Notallthescientistsagreewiththeidea.Somesupposethereshouldbeeasierandmuchcheaperwaystopreventtheearthfromgettingtoohot,suchastoslowdownthepollutionpeoplebringandtoreducethehumanactivities.Whatevertheresultoftheargumentis,thisideaofmini-umbrellasinspaceiscertainlycreative.31.Theunderlinedword“transparent〞hereprobablymeans“〞.

A.透明的 B.透氣的 C.透風(fēng)的32.Pictureshowstherightinformationaboutthemini-umbrellas.

33.Afterscientistssendover1,000billionmini-umbrellasintospace,.

A.pressurefromthesunlightwouldallowthemini-umbrellastobereflectedbacktospaceeasilyB.themini-umbrellaswouldreducetheamountofsunlightreachingtheearthC.sunlightwouldnevercomeintotheearth34.WhichofthefollowingisNOTtrueaccordingtothepassage?A.Scientistssuggestthattheearliestlaunchcouldbeinjust16years.B.Aspaceshipweighingabout1gwouldcarryasunshade.C.Rogerwillsendup800,000mini-umbrellasintospaceduring20years.35.Thebesttitleforthispassageshouldbe.

A.THETEMPERATUREOFTHEEARTHB.AMINI-UMBRELLAPLANC.CHEAPERWAYSTOPREVENTTHEPOLLUTION答案[語(yǔ)篇解讀]本文是一篇說(shuō)明文。介紹了在過(guò)去的200年內(nèi)地球溫度快速升高。美國(guó)的科學(xué)家已經(jīng)在研究解決這個(gè)問(wèn)題的方法:制造微型傘來(lái)降低全球的溫度。文章從科學(xué)的角度詳細(xì)介紹了這種傘的作用,但也有其他科學(xué)家不贊成這種做法。但不可否認(rèn)這種傘是一種創(chuàng)造性的創(chuàng)造。31.A詞義猜想題。由第二段最后一句中的lightcanpassitdirectlytoreachtheearth,withlandsandoceansclearlyinview可猜想出答案為A。32.C細(xì)節(jié)理解題。由第三段第四句中的reflect1.8percentofsunlightback可知A項(xiàng)錯(cuò)誤;由第二段的Aspaceshipweighingabout1gwouldcarryasunshadethatishalfameterlong.可知B項(xiàng)錯(cuò)誤。故答案為C。33.B細(xì)節(jié)理解題。由第三段第二句可知B項(xiàng)正確。34.C推理判斷題。由第三段倒數(shù)第二句可推斷出C項(xiàng)是錯(cuò)誤的。35.B主旨大意題。全文是圍繞mini-umbrella展開(kāi)的,故答案為B。CWhenacomputerworksonagroupofprograms,itcangetveryhot.Coolingthecomputercancostalot.Sosomescientistswonderwhatwouldhappeniftheheatfromthecomputercouldbeused.LargeInternetcompanies(公司)suchasGoogleandMicrosofthavethousandsofcomputers.Asthesecomputersdealwithinformation,theyproducelotsofheat,sotheyneedhugecoolingsystems(系統(tǒng)).Thesesystemssendtheheatintotheair.AcompanyinHolland(荷蘭)thinkspayingtomakethecomputersworkandthenpayingagaintocoolthemareawasteofenergy.Sothecompanydevelopedaspecialdevice—thee-Radiator.BoazLeupe,headofthecompany,saysthee-Radiatorworksasaheatingsystemandsavesmoney.Heexplainsthattheenergyisusedtwice—oncetoheatthehomeandoncetocoolthecomputerandthattheusersdon'thavetopaytocooltheircomputers.FivehomeownersinHollandaretestingtheheatingsystemintheirhomes.“Wepayforthecomputerusing,so,inthatway,homeownersgetheatingforfree,〞Boazsays.JanVisserisoneofthehomeowners.“Ifyouusethecomputermore,thee-Radiatorproducesmoreheat,〞hesays.“Itcannotprovideenoughheatifyoudon'tuseyourcomputeroften.〞Butheisreadytotryit.It'sagreathelpforhisfamily.Thecompanysayse-Radiatorsproduceheattemperaturesofupto55℃.Itsaysthesystemcouldsaveitsusersabout$440ayear.36.Beforethee-Radiatorappears,usuallytheheatofacomputer.

A.issentintotheairB.helpsthefivehomeownersC.isusedtwiceD.makesthecomputerworkbetter37.Thee-Radiatorismainlyused.

A.todrivethecomputerB.tohelpMicrosoftC.toheatthecomputerD.toprovideheat38.TheChinesemeaningoftheword“device〞inthispassageisprobably“〞.

A.節(jié)能 B.實(shí)驗(yàn) C.儀器 D.開(kāi)關(guān)39.Thebesttitleofthepassagemaybe“〞.

A.AnEnvironmentProblemB.ANewWaytoHeatHomesC.TheFutureComputersD.TheEnergytoBeWasted答案[語(yǔ)篇解讀]這是一篇說(shuō)明文。本文介紹了荷蘭一家公司創(chuàng)造了一種特殊的儀器,它能充分利用電腦使用過(guò)程中散發(fā)出的熱量,為家庭供暖。36.A細(xì)節(jié)理解題。由第二段最后一句可知答案。37.D細(xì)節(jié)理解題。由第七段的Ifyouusethecomputermore,thee-Radiatorproducesmoreheat可知答案。38.C詞義猜想題。由第四段的thee-Radiatorworksasaheatingsystemandsavesmoney可知應(yīng)該是一種特殊的儀器。39.B主旨大意題。A.一個(gè)環(huán)境問(wèn)題;B.一種為家庭供暖的新方法;C.未來(lái)的電腦;D.將被浪費(fèi)的能源。根據(jù)文章內(nèi)容可知應(yīng)選B。[長(zhǎng)難句]Sosomescientistswonderwhatwouldhappeniftheheatfromthecomputercouldbeused.所以一些科學(xué)家想知道如果來(lái)自電腦的熱量能被利用起來(lái)將會(huì)發(fā)生什么事情。這是一個(gè)復(fù)合句。wonder后為what引導(dǎo)的賓語(yǔ)從句。if引導(dǎo)條件狀語(yǔ)從句。DNewTechnologyRevolutionizes(變革)LearningMoreandmorepeoplebelievethattechnologiesaregreatforlearning.Today,suchteachingtoolsasiPadsareusedinalotofcourses,includinglanguage,historyandscience.ManyteachersaresupportersofusingiPadsinlanguagelearning.Theysaythatstudentsnowhavemuchmoretimefordiscussionintheclassroom.Insteadofspendingvaluableclasstimelisteningtotextsorwatchingteachingvideos,studentscandothisontheirownandcometoclasspreparedfordiscussion.TheteachersalsosaythatiPadsallowstudentstolearnattheirownpace.Somestudentsmightlistentoadialogueonlyonceandunderstandit,sotheycansavetimefordoingotherthings.Otherstudents,however,mightneedtolistentothesamedialogueagainandagaintounderstandit.UsingiPadsisespeciallyhelpfultostudentswhoarelearningalanguageatdifferentpaces.

Thestudentswhoareusingthenewtoolinsomecoursesarealsohappy.TheybelievethatusingiPadsisamoreenjoyablewaytolearn(suchaslisteningtostoriesandwatchingmovies).Theclasshasbecomemuchmoreinterestingandcreative.Thereareotheradvantagesforstudents.ByusingiPads,theycanpaymoreattentiontothematerialandlearnmore.TeachingnotesarestoredintheiriPadsandareeasytofind.Somestudentsspendmoretimestudyingnow.“Icanlistentomylanguagematerialorwatchteachingvideosonthebus,insteadofhavingtowaituntilIgethome,〞astudentexplained.ManyadultscomplainthattechnologiessuchasiPadsaredoingharmtostudents.TheyworrythatstudentsmightuseiPadstodownloadteachingnotesandusethemtocheatduringexams.SomebelievethatiPadsmayseparatestudentsfromeachother.IfastudentspendsmoretimewatchingvideosonaniPad,hewillhavefeweropportunitiestohaveface-to-facecommunicationwithothers.However,technologiesarealreadyapartofmoststudents'day-to-daylives.Asforcheating,teacherscanaskstudentstohandintheiriPadswhentheytakeexams.Educationneedstomakechangeswiththetimesastechnologyisplayinganimportantpart.WeshouldlookforwardtoawonderfulfuturewheniPadsandothertechnologiescanaddalottotheclassroom.40.Whatdoestheexpression“attheirownpace〞inParagraph3probablymean?A.Accordingtotheirowntimetable.B.Withouttheirteachers'help.C.Becauseoftheirwonderfulgoals.D.Againsttheirparents'hope.41.Fromthepassagewecanlearnthat.

A.studentswithiPadshavelessdiscussioninclassB.studentsgetmorefunfromlearningwithiPadsC.iPadshelpstudentssavetimewaitingforbusesD.iPadspreventstudentsfromcheatinginexams42.Thewriterprobablyagreesthat.

A.teacherscantakecontrolofstudents'learningB.examresultsdependalotonnewtechnologyC.technologyineducationhasabrightfutureD.note-takingisashelpfulasvideo-watching答案[語(yǔ)篇解讀]本文是一篇說(shuō)明文,介紹了新科技對(duì)學(xué)生學(xué)習(xí)的影響,尤其是iPad的廣泛應(yīng)用,在學(xué)生的學(xué)習(xí)中有優(yōu)點(diǎn)也有缺點(diǎn)。本文貼近學(xué)生生活,話(huà)題與時(shí)俱進(jìn),學(xué)生讀起來(lái)很感興趣。40.A詞義猜想題。根據(jù)文章第三段可知,不同的學(xué)生在使用iPad學(xué)習(xí)的過(guò)程中,情況也不同,所以,應(yīng)該根據(jù)自己的時(shí)間安排去使用,應(yīng)選A。41.B細(xì)節(jié)理解題。根據(jù)第四段可知,通過(guò)使用iPad,學(xué)生得到了更多樂(lè)趣,應(yīng)選B。42.C推理判斷題。根據(jù)文章最后一句可知選C。Ⅳ.任務(wù)型閱讀(每題2分,共10分)閱讀下面短文,把A—D四個(gè)句子填入文中空缺處,使短文內(nèi)容完整、正確,然后完成第47小題。DoyouknowwhataMOOCis?MOOCisshortforMassive(大量的)OpenOnlineCourse.ThousandsofpeoplecantakeaMOOCatthesametime.Youcanbeanywhereintheworldtotakeit.43

Foryears,manycollegeshavehadclassesonline.MOOCsarealwaysusedinsubjectslikecomputerscienceandengineering.CanMOOCsbeusedinsubjectslikeartsorphilosophy(哲學(xué))?ScottAndersonteachesphilosophyatauniversityinCanada.44Hesays,“Whenstudentstakesomelessons,theyneedn'tbepresenttohearandgetthem.〞HesaysmoreandmorestudentsinMOOCscanmeanlesscommunicationbetweenthemandtheteachers.Healsogivestwowaystosolvethisproblem—addingmoreteachersa