Unit4第5课时SectionB(3a-SelfCheck)(课时练习)(原卷版+解析)

Unit4Where’smyschoolbag?同步训练题SectionB（3aSelf-check）单选题1．Thepencilboxis______thebedbuttheschoolbagis______thebed.A．in；on B．on；on C．of；under D．on；under2．—______ismyskirt?—It'sbehindthedoor.A．Where B．What C．Whose D．Which3．_________，boys；youcanwin(赢)．A．Comein B．Cometo C．Comeon D．Let's4．ManypeopleliketheprogrammeChinesePoetryConference(诗词大会)________TV.A．in B．on C．at D．of5．Idon’tlikechickenatall.SoI________eatit.A．always B．often C．sometimes D．never6．1.ThisyearPresidentXiJinpingwrotealettertotheyoungpioneersinChinatocelebrate________70thanniversary(周年纪念日).A.their B.them C.theirs D.they7.—Wherearehispencils?—________.A.Yes,theyare B.It’sonthedeskC.Inthepencilbox D.No,theyaren’t8.—Where________thebooks?—They’re________thesofa.[]A.are;of B.is;onC.are;on D.is;under9．－Whereismykey.Mom?－______Isitinyourschoolbag?A．It'shere B．It'sonthefloor C．Itsunderyourbed D．1don'tknow10.—Isyourbrother’sroom?—No,youcanseehisbooks,pensandtoyseverywhere.A.tidy B.nice C.welcome D.next二、用括号内所给单词的适当形式填空1.BettyMr.Greenisagoodteacher.(think)

2.HeisChineseteacher.(we)

3.Thisismybrother.nameisJohn.(he)

4.Wehavethreeoffices(办公室)andtworooms.(computer)

5.ACDandsomeCDsareonthedeskinmyroom.(play)6.Thisismyschoolbag.__________(you)isonthedesk.7.Isthis__________(they)classroom?8.__________(be)thenotebookandthekeyonthetable?9.Thosearemy__________(picture)．10.Thisismy__________(parent)room.It’sverynice.三、用适当介词填空1.Thisisanicephotomyfamily.

2.Thatisabook_______Chinesehistory.

3.PleasesayitChinese,Linda.

4.Heisstanding(站)thetree.

5.Adeskandachairaremyroom.

6.Healwaysaskshisparentssomepocketmoney(零花钱).

7.Hisroomistidy.Whathissister′s?

8.Ourteacherisveryhappy.Thankyou_________yourhelp.

9.Youcane-mailme__________123321@if(如果)youneed(需要)me.

10.Isthissetkeysyours?

四、用and或but填空1.Thisismyunclethatismyaunt.

2.IhavearulerIdon′thaveapen.

3.Mysister′sbooksCDsareeverywhere.

4.Ihaveabook,Idon′tlikeit.

5.Idon′tlikeblue,mysisterdoes.

四、阅读短文,从方框中选择适当的单词填空too,ask,room,tidy,desk,I,he,be,bed,underHello,I’mLucy.Hereismy1..It’stidy.Look!Mybooksanddictionaries2inthebookcase.Myschoolbagisonthe3..Mykeysareonthedesk,4..What’sthat5.thedesk?Oh,it’sabaseball,butit’snot6..It’smybrother’s.MybrotherFrankisnot7..Histhingsareeverywhere.Look!Theblackjacketis8..It’sonmy9..“Whereismyschoolbag?Wherearemykeys?Whereismywatch?”healways10..

提高篇六、短文填空A、根据汉语提示完成短文Goodafternoon,friends,I'mJack,andmybrotherisJim.Please1.(来)tomyhome.IthinkI'm2.(整洁的),butJimisnot.Lookatmy3.(房间).Mytapeplayer,myradio,myclockandmymodelplaneare4.(在……上)thedesk.5.(在哪里)aremybooks?Theyareinthebookcase.Andmyschoolbagisonthe6.(椅子).

LookatJim'sthings.Histhingsarealways7.(到处).Somebooksareonthesofa,andsomeare8.(在……下)thetable.Whereishishat?Doyouknow?Isitonhis9.(头)?Oh,no,it'son10.(我们的)parents'bed.

DoyoulikeJim?Pleasetellme.B、语法填空通读下面的短文,然后在空白处填入一个适当的单词或括号内单词的正确形式。Welcometomyhome.Twobedrooms(卧室)1.(be)inmyhome.Oneisformyparentsandtheotherisforme.Look!Thisismybedroom.Abed,adesk,abookcase2.achairareinit.Thecomputeris3.thedesk.4.aremybooks?5.areinthebookcase.

Thatismy6.(parent)bedroom.Asofaisin7.(they)room.Aphoto8.myfamilyisonthewall.Welook(看起来)veryhappy.Oh,9.isunderthesofa?It’s10.orangemodelplane.Ilikeitverymuch.

C．根据短文内容和所给的汉语或首字母提示，写出空白处所缺单词的正确形式。每空限填一词。MynameisCindy.Ihaveanice________(房间)．Youcanseemanythingsi________it.Somebooksareintheb________andmy________(收音机)isonthedesk.My________(磁带)areonthedesk，t________.W___________aremykeysandrulers？Oh，they'reinmy________(书包)．Look，thisismyfamily________(照片)．It'sonthewall.I'm________(整洁的)，b________mybrotherisnot.Hisbooksandpencilsare________(到处)．Where'shisjacket？Oh，Idon'tk________.I________(认为)it'sinourparents'room，on________(他们的)bed.His________(钢笔)isunderthechairandhis________(橡皮)areonthefloor(地板)．八、完形填空Look!Thisisaphotoofour1.Atable,eightdesksandeightchairs2inthephoto.A3andtwostudentsareinit,too.

4arethoseonthetable?Theyarethreebooks.Apencilboxisonit,too.Twopensandthreepencilsareinthepencilbox.Aschoolbagisonachair.What’sthat5thefloor?It’sahat.Oh,no.It’sawhiteandblack6.Whosebagisit?Idon’t7.

TheteacherisMs.Smith.8isanEnglishteacher.ThestudentsareJack9Mary.Jackiseight.Maryisnine.They’regoodfriends.OurmathteacherisMr.Green.Heisnotinthephoto.He’s10theretohelpus.Wealllikehim.1．A．classroom B．bedroom C．friend D．family2．A．is B．am C．are D．be3．A．parent B．boy C．dog D．teacher4．A．Who B．What C．Where D．How5．A．to B．in C．under D．on6．A．bag B．bed C．baseball D．cup7．A．lose B．call C．know D．spell8．A．He B．She C．It D．They9．A．so B．and C．or D．but10．A．always B．not C．too D．only九、阅读理解AHello,boysandgirls.PmMonaGreen.I’manEnglishgirl.Look!Thisismybedroom.Thewalliswhite.Andthebedispink.What’sthisonthebed?It’sabluequilt.What’sunderthebed?It’sabaseball.It’sLily’s.Sheismysister.Thereisaplantnearmybed.It’sgreen.Mybrother,Jim,alwayswaterstheplant.Andthat’sadesk.It’syellow.Thereisacomputeronthedesk.Myfathergivesittome.There’sachairnexttothedesk.Andthereisavolleyball(排球)underit.Ihaveabookcase,andtherearemanybooksinit.Mymotheroftenbuysbooksforme.Oh,what’sthisonthewall?It’sapictureofapark.Canyouseemyclock?Isitonthesofa?No，it’sonthesmallredtablenexttomybed.1.Theispink.A.bed B.tableC.plant D.wall2What’sontheyellowdesk?A.Theclock. B.Thepicture.C.Thecomputer. D.Thevolleyball.3.Thebaseballis.A.Mona’s B.Mona’sbrother’sC.Mona’ssister’sD.Mona’sfather’s4.Whichisright？A.Thequiltisgreen.B.Monaalwayswaterstheplantinherbedroom.C.Mona’sfatherbuysmanybooksforher.D.Thereisapictureofaparkonthewall.5.Whatisthearticle(文章)about?A.Mona’sfamily. B.Mona’sbedroom.C.Mona’ssisterLily.D.Mona’sschool.BHello,I′mJack.Pleaselookatthepictureofmyclassroom.Onthefrontwall,thereisablackboard.It′sverybig.Infrontoftheblackboard,thereisayellowdesk.It′sforourteachers.Thereisacomputeronit.OntherightwallisamapofChina.Ontheback(后面)wallisablackboard.Wecanwriteanddrawonit.Therearefortystudentsinmyclass.Everyonehasadeskandachair.Inmyclassroom,mydeskisnexttoLiFang′sdesk.Sheisonmyleft.AndTimisonmyright.InfrontofmeisJohn.Whoisbehindme?It′sagirl,Amy.Sheismygoodfriend.Doyouwanttocometomyclassroom?It′saniceroom.1.Howmanyblackboardsarethereintheclassroom?A.One. B.Two.C.Three. D.Four.2.What′sontherightwall?A.Aclock. B.AmapofChina.C.Amapoftheworld.D.Apicture.3.TherearedesksinJack′sclassroom.

A.20 B.21 C.40 D.414.WhereisJackintheclassroom?A.HeisonLiFang′sleft.B.HeisinfrontofJohn.C.HeisbehindAmy.D.HeisbetweenTimandLiFang.十、书面表达本单元写作要求同学们能简单介绍自己的家、卧室等场所，内容包括物品的特点及位置。1．能用in，on，under等方位介词表达物品所在的位置；2．能正确地使用连词and，but连接短语和句子。一、词汇积累(一)把下列短语译成英语。1．一本英语字典________________2．两本红色的笔记本________________3．一串钥匙________________4．一只蓝色手表________________5．在床下面________________6．在书橱里________________7．一个黑色飞机模型________________8．我的时钟________________9．在铅笔盒里________________10．在沙发下面________________(二)把下列短语译成汉语。1．Tom'stapeplayer________________2．ourroom________________3．herpurplehat________________4．underthechair________________5．onthetable________________6．sixwhitecups________________7．yourbaseball________________8．Paul'sIDcard________________二、句子积累1．那把白色的尺子是她的。2．两台收音机在桌子上吗？3．我的地图不在书柜里。4．我认为它不在书包里。5．——你的铅笔在哪儿？——它们在铅笔盒里。6.

我的文具盒和书在书柜里吗？7.

——他的书包在教室里吗？——我不知道。8.

我的夹克衫在床上，但我的帽子不在。9.Andy，快点儿！10.

书桌下的橡皮是你的吗？【实战演练】请根据下面这幅图片的提示,用英语写一篇短文介绍一下Betty的房间。

Unit4Where’smyschoolbag?同步训练题SectionB（3aSelf-check）单选题1．Thepencilboxis______thebedbuttheschoolbagis______thebed.A．in；on B．on；on C．of；under D．on；under【答案】D【解析】点拨：句中的but说明前后的介词应为互为反义词，四个选项中只有D项符合，故选D项。2．—______ismyskirt?—It'sbehindthedoor.A．Where B．What C．Whose D．Which【答案】A【解析】点拨：考查疑问词。A项意为“在哪里”；B项意为“什么”；C项意为“谁的”；D项意为“哪一个”。由答语“It'sbehindthedoor.(它在门后。)”可知是询问地点。故应选A项。3．_________，boys；youcanwin(赢)．A．Comein B．Cometo C．Comeon D．Let's【答案】C【解析】点拨：根据句意“男孩们，加油啊，你们会赢的”可知，此处应选一个表示“加油”的短语，四个选项中只有comeon有此意，故选C项。4．ManypeopleliketheprogrammeChinesePoetryConference(诗词大会)________TV.A．in B．on C．at D．of【答案】B【解析】句意：许多人喜欢电视上的《中国诗词大会》这个节目。考查介词辨析。in在……里；on在……上；at在；of……的。固定搭配：onTV“在电视上”，故选B。5．Idon’tlikechickenatall.SoI________eatit.A．always B．often C．sometimes D．never【答案】D【解析】句意：我根本不喜欢鸡肉。所以我从不吃它。考查副词辨析。always总是；often经常；sometimes有时；never从不。根据“Idon’tlikechickenatall”可知，不喜欢吃鸡肉，所以很少吃它，故选D。6．1.ThisyearPresidentXiJinpingwrotealettertotheyoungpioneersinChinatocelebrate________70thanniversary(周年纪念日).A.their B.them C.theirs D.they【答案】A【解析】考查代词。their他们的，形容词性物主代词；them他们，人称代词宾格；theirs他们的，名词性物主代词；they他们，人称代词主格。根据句子结构可知空格处应填入形容词性物主代词，修饰anniversary，故选A。7.—Wherearehispencils?—________.A.Yes,theyare B.It’sonthedeskC.Inthepencilbox D.No,theyaren’t【答案】C【解析】问句为特殊疑问句,不能用yes回答,排除A、D选项。询问的是复数名词,代词该用they,不用it。故B也不正确。故选C8.—Where________thebooks?—They’re________thesofa.[]A.are;of B.is;onC.are;on D.is;under【答案】C【解析】考查主谓一致和介词。由于books是复数，所以be动词用are，排除B、D两项；onthesofa意为在沙发上，所以选C。9．－Whereismykey.Mom?－______Isitinyourschoolbag?A．It'shere B．It'sonthefloor C．Itsunderyourbed D．1don'tknow【答案】D【解析】句意：-妈妈，我的钥匙在哪里？-我不知道，它在你的书包里吗？It’shere.它在这儿；It’sonthefloor.它在地板上；It’sunderyourbed.它在你的床底下；Idon’tknow.我不知道。根据下句话Isitinyourschoolbag?可知，妈妈也不知道钥匙在哪里，所以才会用疑问句的形式。故应选D。10.—Isyourbrother’sroom?—No,youcanseehisbooks,pensandtoyseverywhere.A.tidy B.nice C.welcome D.next【答案】A【解析】句意：——你弟弟的房间整洁吗？——不，你可以到处看到他的书、钢笔和玩具。考查形容词。tidy整齐的；nice美好的；welcome欢迎；next下一个。根据“youcanseehisbooks,pensandtoyseverywhere.”可知弟弟的房间到处是他的书、钢笔和玩具，那么上面问的应是是否整洁。故选A。二、用括号内所给单词的适当形式填空1.BettyMr.Greenisagoodteacher.(think)

2.HeisChineseteacher.(we)

3.Thisismybrother.nameisJohn.(he)

4.Wehavethreeoffices(办公室)andtworooms.(computer)

5.ACDandsomeCDsareonthedeskinmyroom.(play)6.Thisismyschoolbag.__________(you)isonthedesk.7.Isthis__________(they)classroom?8.__________(be)thenotebookandthekeyonthetable?9.Thosearemy__________(picture)．10.Thisismy__________(parent)room.It’sverynice.【答案】1.thinks2.our3.his4.computer5.player6.uours7.their8.Are9.pictures10.parent’s三、用适当介词填空1.Thisisanicephotomyfamily.

2.Thatisabook_______Chinesehistory.

3.PleasesayitChinese,Linda.

4.Heisstanding(站)thetree.

5.Adeskandachairaremyroom.

6.Healwaysaskshisparentssomepocketmoney(零花钱).

7.Hisroomistidy.Whathissister′s?

8.Ourteacherisveryhappy.Thankyou_________yourhelp.

9.Youcane-mailme__________123321@if(如果)youneed(需要)me.

10.Isthissetkeysyours?

【答案】1.of2.about3.in4.under5.in6.for7.about8.for9.at10.of四、用and或but填空1.Thisismyunclethatismyaunt.

2.IhavearulerIdon′thaveapen.

3.Mysister′sbooksCDsareeverywhere.

4.Ihaveabook,Idon′tlikeit.

5.Idon′tlikeblue,mysisterdoes.

【答案】1.and2.but3.and4.but5.but四、阅读短文,从方框中选择适当的单词填空too,ask,room,tidy,desk,I,he,be,bed,underHello,I’mLucy.Hereismy1..It’stidy.Look!Mybooksanddictionaries2inthebookcase.Myschoolbagisonthe3..Mykeysareonthedesk,4..What’sthat5.thedesk?Oh,it’sabaseball,butit’snot6..It’smybrother’s.MybrotherFrankisnot7..Histhingsareeverywhere.Look!Theblackjacketis8..It’sonmy9..“Whereismyschoolbag?Wherearemykeys?Whereismywatch?”healways10..

【答案】1.room2.are3.desk4.too5.under6.mine7.tidy8.his9.bed10.asks提高篇六、短文填空A、根据汉语提示完成短文Goodafternoon,friends,I'mJack,andmybrotherisJim.Please1.(来)tomyhome.IthinkI'm2.(整洁的),butJimisnot.Lookatmy3.(房间).Mytapeplayer,myradio,myclockandmymodelplaneare4.(在……上)thedesk.5.(在哪里)aremybooks?Theyareinthebookcase.Andmyschoolbagisonthe6.(椅子).

LookatJim'sthings.Histhingsarealways7.(到处).Somebooksareonthesofa,andsomeare8.(在……下)thetable.Whereishishat?Doyouknow?Isitonhis9.(头)?Oh,no,it'son10.(我们的)parents'bed.

DoyoulikeJim?Pleasetellme.【答案】1.come2.tidy3.room4.on5.Where6.chair7.everywhere8.under9.head10.ourB、语法填空通读下面的短文,然后在空白处填入一个适当的单词或括号内单词的正确形式。Welcometomyhome.Twobedrooms(卧室)1.(be)inmyhome.Oneisformyparentsandtheotherisforme.Look!Thisismybedroom.Abed,adesk,abookcase2.achairareinit.Thecomputeris3.thedesk.4.aremybooks?5.areinthebookcase.

Thatismy6.(parent)bedroom.Asofaisin7.(they)room.Aphoto8.myfamilyisonthewall.Welook(看起来)veryhappy.Oh,9.isunderthesofa?It’s10.orangemodelplane.Ilikeitverymuch.

【答案】1.are2.and3.on4.Where5.they6.parents’7.their8.of9.what10.anC．根据短文内容和所给的汉语或首字母提示，写出空白处所缺单词的正确形式。每空限填一词。MynameisCindy.Ihaveanice________(房间)．Youcanseemanythingsi________it.Somebooksareintheb________andmy________(收音机)isonthedesk.My________(磁带)areonthedesk，t________.W___________aremykeysandrulers？Oh，they'reinmy________(书包)．Look，thisismyfamily________(照片)．It'sonthewall.I'm________(整洁的)，b________mybrotherisnot.Hisbooksandpencilsare________(到处)．Where'shisjacket？Oh，Idon'tk________.I________(认为)it'sinourparents'room，on________(他们的)bed.His________(钢笔)isunderthechairandhis________(橡皮)areonthefloor(地板)．【答案】room；in；bookcase；radio；tapes；too；Where；schoolbag；photo；tidy；but；everywhere；know；think；their；pen；erasers八、完形填空Look!Thisisaphotoofour1.Atable,eightdesksandeightchairs2inthephoto.A3andtwostudentsareinit,too.

4arethoseonthetable?Theyarethreebooks.Apencilboxisonit,too.Twopensandthreepencilsareinthepencilbox.Aschoolbagisonachair.What’sthat5thefloor?It’sahat.Oh,no.It’sawhiteandblack6.Whosebagisit?Idon’t7.

TheteacherisMs.Smith.8isanEnglishteacher.ThestudentsareJack9Mary.Jackiseight.Maryisnine.They’regoodfriends.OurmathteacherisMr.Green.Heisnotinthephoto.He’s10theretohelpus.Wealllikehim.1．A．classroom B．bedroom C．friend D．family2．A．is B．am C．are D．be3．A．parent B．boy C．dog D．teacher4．A．Who B．What C．Where D．How5．A．to B．in C．under D．on6．A．bag B．bed C．baseball D．cup7．A．lose B．call C．know D．spell8．A．He B．She C．It D．They9．A．so B．and C．or D．but10．A．always B．not C．too D．only【答案】1．A2．C3．D4．B5．D6．A7．C8．B9．B10．A【解析】本文是一篇记叙文。文章主要讲述了作者的一张教室照片，通过照片作者介绍了他的教室，教师和同学们。1．句意：这是我们教室的照片。classroom教室；bedroom卧室；friend朋友；family家人。由下文“Atable,eightdesksandeightchairs”可知，是教室里的照片。故选A。2．句意：照片里有一张桌子，8张课桌和8条椅子。isbe动词单数形式；ambe动词单数，一般用于第一人称后；arebe动词复数形式；bebe动词原形。主语一张桌子，8张课桌和8条椅子是复数，故be动词用复数形式。故选C。3．句意：照片里也有一个老师和2个学生。parent父母；boy男孩；dog狗；teacher老师。由下文“TheteacherisMs.Smith.”可知，照片里有老师。故选D。4．句意：桌子上的那些是什么东西呢？Who谁；What什么；Where哪里；How怎样。由下文“Theyarethreebooks”可知，在问桌子上的是什么。故选B。5．句意：在地板上的那个是什么？to差，朝；in在……里面；under在……下面；on在……上面。根据句意指在地板上，固定短语onthefloor在地板上。故选D。6．句意：那是一个黑白色的包。bag包；bed床；baseball棒球；cup杯子。由下文“Whosebagisit?”可知，是一个包。故选A。7．句意：我不知道。lose丢失；call打电话；know知道；spell拼读。由上文“Whosebagisit?”可知，要回答这是谁的包，根据语境指我不知道。故选C。18．句意：她是一个英语老师。He他；She她；It它；They他们。由上文“TheteacherisMs.Smith”可知，空格处的指女性的她。故选B。9．句意：学生是Jack和Mary。so所以；and和；or或者，否则；but但是。根据句意指Jack和Mary，空格处缺少一个并列连词，指“和”的意思。故选B。10．句意：他总是在那里帮助我们。always总是；not不；too也；only仅仅。由下文“Wealllikehim.”可知他总是给予我们帮助，所以我们都喜欢他。故选A。九、阅读理解AHello,boysandgirls.PmMonaGreen.I’manEnglishgirl.Look!Thisismybedroom.Thewalliswhite.Andthebedispink.What’sthisonthebed?It’sabluequilt.What’sunderthebed?It’sabaseball.It’sLily’s.Sheismysister.Thereisaplantnearmybed.It’sgreen.Mybrother,Jim,alwayswaterstheplant.Andthat’sadesk.It’syellow.Thereisacomputeronthedesk.Myfathergivesittome.There’sachairnexttothedesk.Andthereisavolleyball(排球)underit.Ihaveabookcase,andtherearemanybooksinit.Mymotheroftenbuysbooksforme.Oh,what’sthisonthewall?It’sapictureofapark.Canyouseemyclock?Isitonthesofa?No，it’sonthesmallredtablenexttomybed.1.Theispink.A.bed B.tableC.plant D.wall2What’sontheyellowdesk?A.Theclock. B.Thepicture.C.Thecomputer. D.Thevolleyball.3.Thebaseballis.A.Mona’s B.Mona’sbrother’sC.Mona’ssister’sD.Mona’sfather’s4.Whichisright？A.Thequiltisgreen.B.Monaalwayswaterstheplantinherbedroom.C.Mona’sfatherbuysmanybooksforher.D.Thereisapictureofaparkonthewall.5.Whatisthearticle(文章)about?A.Mona’sfamily. B.Mona’sbedroom.C.Mona’ssisterLily.D.Mona’sschool.【答案】ACCDB【解析】：1.A细节理解题。根据文中的"Andthebedispink"可知答案。2.C细节理解题。根据文中的"Thereisacomputeronthedesk"贫知答案。3.C细节理解题。根据女中的"It’sabaseball.It’sLily’s.Sheismysister"可知答案。4.D细节理解题。根据文中的"Oh,what’sthisonthewall?It’sapictureofapark"可知答案。5.B主旨大意题。通读文章可知，本文主要介绍了作者的房间。BHello,I′mJack.Pleaselookatthepictureofmyclassroom.Onthefrontwall,thereisablackboard.It′sverybig.Infrontoftheblackboard,thereisayellowdesk.It′sforourteachers.Thereisacomputeronit.OntherightwallisamapofChina.Ontheback(后面)wallisablackboard.Wecanwriteanddrawonit.Therearefortystudentsinmyclass.Everyonehasadeskandachair.Inmyclassroom,mydeskisnexttoLiFang′sdesk.Sheisonmyleft.AndTimisonmyright.InfrontofmeisJohn.Whoisbehindme?It′sagirl,Amy.Sheismygoodfriend.Doyouwanttocometomyclassroom?It′saniceroom.1.Howmanyblackboardsarethereintheclassroom?A.One. B.Two.C.Three. D.Four.2.What′sontherightwall?A.Aclock. B.AmapofChina.C.Amapoftheworld.D.Apicture.3.TherearedesksinJack′sclassroom.

A.20 B.21 C.40 D.414.WhereisJackintheclassroom?A.HeisonLiFang′sleft.B.HeisinfrontofJohn.C.HeisbehindAmy.D.HeisbetweenTimandLiFang.【答案】BBDD【解析】1.B细节理解题。根据“Onthefrontwall,thereisablackboard…Onthebackwallisablackboard.”可知,在教室的前后墙上都有一块黑板,故