2026年重庆北师大版初中英语九年级上册第3单元课后练习题

2026年重庆北师大版初中英语九年级上册第3单元课后练习题一、单项选择题（总共10题，每题2分，共20分）1.AccordingtothepassageinUnit3,whatisthemainreasonwhymanystudentschoosetostudysciencesubjects?A.Becausesciencesubjectsareeasierthanothersubjects.B.Becausesciencesubjectscanhelpthemunderstandtheworldbetter.C.Becausesciencesubjectsaremoreinterestingthanartsubjects.D.Becausesciencesubjectshavemorejobopportunitiesinthefuture.解析：本题考查学生对单元主题“科学学科的重要性”的理解。正确答案为B，因为单元文章强调科学学科帮助人们理解世界，而A、C、D选项与文章主旨不符。干扰项设计上，A选项利用“容易”这一常见误解，C选项对比艺术学科制造无关干扰，D选项强调就业机会但未提及文章核心观点。2.Whatdoestheunderlinedword"breathtaking"meaninthesentence"Theviewfromthetopofthemountainwasbreathtaking"?A.BoringB.AmazingC.TiringD.Expensive解析：本题考查词汇理解能力。正确答案为B，根据单元词汇部分对形容词的讲解，breathtaking意为“令人惊叹的”。A选项“无聊的”与词义相反，C选项“累人的”属于语义干扰，D选项“昂贵的”与词性无关。3.Accordingtothepassageaboutenvironmentalprotection,whichofthefollowingisNOTagoodwaytoprotecttheenvironment?A.Usingreusablebagsinsteadofplasticbags.B.Turningofflightswhenleavingaroom.C.Throwingtrasheverywhere.D.Plantingmoretreesincities.解析：正确答案为C，单元文章明确指出乱扔垃圾会污染环境。A选项“使用可重复使用的购物袋”是环保措施，B选项“离开房间时关灯”符合节能原则，D选项“在城市里种更多树”有助于改善环境，均与文章观点一致。4.Whatisthebesttitleforthepassageaboutfamousscientists?A.FamousScientistsinHistoryB.WhyScientistsAreImportantC.TheLifeofMarieCurieD.ScienceJobsfortheFuture解析：正确答案为A，文章列举多位科学家的事迹，属于历史性概述。B选项“科学家的重要性”过于宽泛，C选项仅提及居里夫人，D选项偏向未来职业，均未全面概括文章内容。5.Accordingtothepassageaboutspaceexploration,whatdidNeilArmstrongsaywhenhefirststeppedonthemoon?A."That'sonesmallstepforman,onegiantleapformankind."B."Iamthefirstpersontowalkonthemoon."C."Spaceexplorationisverydangerous."D."Themoonismadeofcheese."解析：正确答案为A，单元文章引用了阿姆斯特朗的名言。B选项夸大其词，C选项与文章观点无关，D选项属于无稽之谈，均为干扰项。6.Whatdoesthepassageabout"savingenergy"mainlytellus?A.Howtouseenergymoreefficiently.B.Whypeopleshouldsaveenergy.C.Thehistoryofenergysaving.D.Thetypesofenergyweuse.解析：正确答案为A，文章重点介绍节能方法。B选项“为什么应该节能”属于背景信息，C选项“节能历史”和D选项“能源类型”均未涵盖文章核心内容。7.Accordingtothepassageabout"globalwarming,"whatisamajorcauseofglobalwarming?A.Usingtoomuchelectricity.B.Burningfossilfuels.C.Eatingtoomuchmeat.D.Buildingtoomanyhouses.解析：正确答案为B，单元文章明确指出燃烧化石燃料是温室效应的主要原因。A选项“用电过多”影响较小，C选项“吃太多肉”与文章主题无关，D选项“盖太多房子”属于间接影响。8.Whatisthemainideaofthepassageabout"theimportanceofreading"?A.Readingcanhelpyoupassexams.B.Readingisagoodwaytorelax.C.Readingcanimproveyourknowledge.D.ReadingismoreimportantthanwatchingTV.解析：正确答案为C，文章强调阅读对知识积累的作用。A选项“帮助考试”是阅读的间接好处，B选项“放松”是阅读的次要功能，D选项“比看电视重要”属于主观比较。9.Accordingtothepassageabout"thehistoryofcomputers,"whatwasthefirstcomputerlike?A.Itwassmallandportable.B.Itwasveryexpensiveanddifficulttouse.C.Itwasmadeofwoodandmetal.D.Itcouldonlydosimplecalculations.解析：正确答案为B，文章指出早期计算机体积大且操作复杂。A选项“小巧便携”与历史事实不符，C选项“木质金属材质”属于无根据描述，D选项“只能做简单计算”过于片面。10.Whatisthemainpurposeofthepassageabout"thefutureoftechnology"?A.Totellushowtousenewtechnology.B.Towarnusaboutthedangersoftechnology.C.Topredictwhattechnologywillbelikeinthefuture.D.Toaskustobuynewgadgets.解析：正确答案为C，文章属于科技趋势预测。A选项“如何使用新技术”属于应用层面，B选项“科技危害”与文章基调不符，D选项“推销产品”属于商业宣传。二、填空题（总共10题，每题2分，共20分）1.Thepassageabout"theenvironment"tellsusthatweshould______toprotectourplanet.解析：答案为takeaction，单元文章强调保护环境需要行动。2.Accordingtothepassageabout"famousscientists,"MarieCuriewontheNobelPrizein______.解析：答案为PhysicsandChemistry，文章明确提及居里夫人获得物理和化学奖。3.Thepassageabout"spaceexploration"mentionsthatthefirstpersontowalkonthemoonwas______.解析：答案为NeilArmstrong，单元文章引用其名言。4.Thepassageabout"savingenergy"suggeststhatwecansaveenergyby______.解析：答案为turningofflightswhennotneeded，文章列举节能方法。5.Thepassageabout"globalwarming"saysthatglobalwarmingcancause______.解析：答案为highertemperaturesandmoreextremeweather，文章列举温室效应后果。6.Thepassageabout"theimportanceofreading"mentionsthatreadingcanhelpus______.解析：答案为understandtheworldbetter，文章强调阅读对认知的作用。7.Thepassageabout"thehistoryofcomputers"saysthatthefirstcomputerswere______.解析：答案为verylargeandslow，文章描述早期计算机特点。8.Thepassageabout"thefutureoftechnology"predictsthatinthefuture,technologywillbe______.解析：答案为moreadvancedanduseful，文章展望科技发展趋势。9.Thepassageabout"theenvironment"mentionsthatplasticbagsareharmfulto______.解析：答案为animalsandtheenvironment，文章指出塑料袋污染问题。10.Thepassageabout"famousscientists"tellsusthatscientistsareimportantbecausethey______.解析：答案为makenewdiscoveries，文章强调科学家的贡献。三、判断题（总共10题，每题2分，共20分）1.Accordingtothepassageabout"sciencesubjects,"studentswholikesciencecanbecomescientistsiftheyworkhard.解析：正确。文章鼓励热爱科学的同学努力发展。2.Theunderlinedword"breathtaking"inthesentence"Theviewfromthetopofthemountainwasbreathtaking"means"amazing."解析：正确。单元词汇部分解释该词意为“令人惊叹的”。3.Thepassageabout"environmentalprotection"saysthatthrowingtrasheverywhereisagoodhabit.解析：错误。文章明确指出乱扔垃圾会污染环境。4.Thebesttitleforthepassageaboutfamousscientistsis"TheLifeofMarieCurie."解析：错误。文章介绍多位科学家，标题应更全面。5.Accordingtothepassageaboutspaceexploration,NeilArmstrongsaid"Themoonismadeofcheese."解析：错误。文章引用的名言与该选项不符。6.Thepassageabout"savingenergy"suggeststhatusingmoreelectricityisagoodwaytosaveenergy.解析：错误。文章强调减少用电而非增加。7.Thepassageabout"globalwarming"saysthateatingtoomuchmeatisamajorcauseofglobalwarming.解析：错误。文章未提及饮食与温室效应的直接关系。8.Thepassageabout"theimportanceofreading"saysthatreadingismoreimportantthanwatchingTV.解析：错误。文章未进行主观比较。9.Thepassageabout"thehistoryofcomputers"saysthatthefirstcomputerwassmallandportable.解析：错误。文章指出早期计算机体积大且笨重。10.Thepassageabout"thefutureoftechnology"predictsthattechnologywillbelessadvancedinthefuture.解析：错误。文章认为科技将更先进。四、简答题（总共8题，每题2分，共16分）1.Accordingtothepassageabout"sciencesubjects,"whyaresciencesubjectsimportantforstudents?参考答案：（1）Sciencesubjectshelpstudentsunderstandhowtheworldworks.（2）Sciencesubjectscaninspirestudentstomakenewdiscoveries.（3）Sciencesubjectsareusefulformanyjobsinthefuture.解析：本题考查对单元主题的理解。答案需包含科学学科对认知、创新和职业发展的作用，每点2分，共4分。2.Whatdoesthepassageabout"environmentalprotection"suggestwecandotohelptheenvironment?参考答案：（1）Reducetheuseofplasticbags.（2）Savewaterandelectricity.（3）Plantmoretrees.（4）Recyclewaste.解析：本题考查环保措施。答案需列举至少3项具体行动，每项1分，共2分。3.Accordingtothepassageabout"famousscientists,"whatqualitiesdogoodscientistshave?参考答案：（1）Curiosity:Theyalwaysaskquestions.（2）Hardwork:Theyspendalotoftimeonresearch.（3）Creativity:Theythinkinnewways.解析：本题考查科学家品质。答案需包含好奇心、勤奋和创造力，每点1分，共2分。4.Whatdoesthepassageabout"spaceexploration"tellusaboutthefutureofspacetravel?参考答案：（1）Spacetravelwillbesafer.（2）Morepeoplewillgotospace.（3）Wemayfindlifeonotherplanets.解析：本题考查太空探索趋势。答案需包含安全性、参与度、发现等方向，每点1分，共2分。5.Accordingtothepassageabout"savingenergy,"whyissavingenergyimportant?参考答案：（1）Toprotecttheenvironment.（2）Toreducepollution.（3）Tosavemoney.解析：本题考查节能意义。答案需包含环保、减污、省钱等角度，每点1分，共2分。6.Whatdoesthepassageabout"theimportanceofreading"sayaboutreadingforpleasure?参考答案：（1）Readingforpleasurecanhelpyourelax.（2）Readingforpleasurecanimproveyourimagination.（3）Readingforpleasurecanbeagoodwaytospendfreetime.解析：本题考查阅读乐趣。答案需包含放松、想象力、休闲价值，每点1分，共2分。7.Accordingtothepassageabout"thehistoryofcomputers,"howhavecomputerschangedsincethefirstoneswereinvented?参考答案：（1）Theyhavebecomesmaller.（2）Theyarefaster.（3）Theyaremoreaffordable.解析：本题考查计算机发展。答案需包含体积、速度、价格等变化，每点1分，共2分。8.Whatdoesthepassageabout"thefutureoftechnology"sayabouttechnologyinourdailylives?参考答案：（1）Technologywillmakeourliveseasier.（2）Technologywillhelpuscommunicatebetter.（3）Technologywillcreatenewjobs.解析：本题考查科技与生活。答案需包含便利性、沟通、就业等影响，每点1分，共2分。五、应用题（总共8题，每题4分，共24分）1.SupposeyouareastudentinClass9.Writeashortparagraph(about50words)toyourfriendaboutwhyyouthinksciencesubjectsareimportant.参考答案：Ithinksciencesubjectsareimportantbecausetheyhelpusunderstandtheworld.Sciencecanexplainhowthingswork,likegravityorphotosynthesis.Learningsciencecanalsohelpmefindagoodjobinthefuture.Forexample,Iwanttobeadoctor,andsciencesubjectsarenecessaryforthat.解析：本题考查写作能力。答案需包含科学学科对认知和职业的帮助，结构完整得3分，语言流畅得1分。2.Imagineyouareamemberofaschoolenvironmentalclub.Writeashortnotice(about50words)toremindstudentstoprotecttheenvironment.参考答案：Notice:ProtectOurEnvironment!Pleasedonotthrowtrasheverywhere.Usereusablebagsinsteadofplasticones.Savewaterandelectricity.Planttreesoncampus.Everysmallactioncanhelp!解析：本题考查应用写作。答案需包含具体环保措施，格式正确得2分，内容完整得2分。3.Accordingtothepassageabout"famousscientists,"writeashortparagraph(about50words)todescribeMarieCurie'sachievements.参考答案：MarieCuriewasagreatscientist.ShewontheNobelPrizeinPhysicsandChemistry.Shediscoveredtwoelements,poloniumandradium.Herworkwasveryimportantforscience.Sheshowedthatwomencanbescientiststoo.解析：本题考查信息整合。答案需包含获奖、发现元素、意义等要点，内容准确得3分，表达清晰得1分。4.Supposeyouareplanningaschooltriptoasciencemuseum.Writeashortparagraph(about50words)todescribewhatyouhopetoseethere.参考答案：Ihopetoseemanyinterestingexhibitsaboutspace.Iwanttolearnaboutplanetsandstars.Ialsohopetoseearealrocket.Itwillbeamazingtoseehowscienceworksinreallife.解析：本题考查想象写作。答案需包含具体参观内容，逻辑连贯得3分，语言自然得1分。5.Writeashortparagraph(about50words)toexplainwhysavingenergyisimportantforourschool.参考答案：Savingenergyisimportantforourschoolbecauseitcanhelpussavemoney.Turningofflightsandcomputerssaveselectricity.Italsoreducespollution.Ifwealldoit,ourschoolcanbemoreenvironmentallyfriendly.解析：本题考查逻辑分析。答案需包含省钱、减污等理由，结构完整得3分，表达准确得1分。6.Imagineyouareinterviewingafamousscientist.Writeashortdialogue(about50words)betweenyouandthescientist.参考答案：Student:Hello,Professor!Whatinspiredyoutobecomeascientist?Scientist:Hello!Iwasalwayscuriousabouthowthingswork.Scienceanswersquestions,andthat'sexciting!Student:Thankyou!Scientist:You'rewelcome!Keepaskingquestions!解析：本题考查口语交际。答案需包含问答形式，内容符合科学家身份，表达自然得3分，逻辑合理得1分。7.Writeashortparagraph(about50words)todescribewhatyouthinkthefutureoftechnologywillbelike.参考答案：Inthefuture,technologywillbemoreadvanced.Robotswilldomanyjobs.Virtualrealitywillbecommon.Technologywillmakeourliveseasierandmorefun.Itwillalsohelpussolvebigproblems.解析：本题考查预测能力。答案需包含科技发展趋势，观点明确得3分，语言流畅得1分。8.Supposeyouarewritingareportaboutenvironmentalprotection.Writeashortparagraph(about50words)todescribeaproblemcausedbypollution.参考答案：Airpollutionisabigproblem.Itmakespeoplecoughandfeelsick.