2026年天津市北师大版高中英语一轮复习完形填空冲刺练习

2026年天津市北师大版高中英语一轮复习完形填空冲刺练习1.Whilereadingapassageaboutenvironmentalprotection,weoftenencounterwordslike"sustainabledevelopment"and"carbonfootprint".Thesetermsareexamplesof______.A.idiomaticexpressionsthatconveyculturalmeaningsB.technicaltermsspecifictoenvironmentalscienceC.colloquialismsusedindailyconversationsD.metaphoricallanguagetodescribeabstractconcepts（解析：本题考查单元核心词汇“sustainabledevelopment”和“carbonfootprint”的词义辨析。根据第7单元“环境保护”主题，这两个词汇属于环境科学的专业术语，故B项正确。A项“习语”错误，因为它们不是固定搭配；C项“口语”错误，因为它们多用于正式文本；D项“隐喻”错误，因为它们直接指代具体概念而非抽象表达。该题难度中等，需结合单元主题判断专业词汇属性。）2.Inthepassage"TheImpactofSocialMediaonTeenagers",theauthorusesthephrase"adouble-edgedsword"todescribesocialmedia.Thisphrasesuggeststhat______.A.socialmediaisalwaysharmfultoteenagersB.socialmediahasbothpositiveandnegativeeffectsC.socialmediaisanewtypeofcommunicationtoolD.socialmediaismorepopularthantraditionalmedia（解析：本题考查单元重点句型“adouble-edgedsword”的比喻义。第7单元强调辩证看待社会现象，该短语常用于形容具有两面性的事物，故B项正确。A项“绝对有害”与原文矛盾；C项“新型工具”未体现比喻义；D项“比传统媒体流行”与比喻无关。该题难度中等，需理解单元核心句型。）3.Thepassage"GlobalWarming:CausesandEffects"mentionsthat"thepolaricecapsaremeltingatanalarmingrate".Thissentenceuses______toemphasizetheurgencyoftheproblem.A.statisticstoprovideconcreteevidenceB.emotionallanguagetoappealtoreadersC.arhetoricalquestiontoprovokethoughtD.ametaphortodescribethesituationvividly（解析：本题考查单元写作技巧“强调手段”。第7单元强调科学文本的客观性，数据是主要论证方式，故A项正确。B项“情感语言”与原文客观风格不符；C项“反问句”未在文中出现；D项“隐喻”未使用。该题难度中等，需结合单元写作特点分析。）4.Inthepassage"TraditionalChineseMedicineandModernMedicine",theauthorcomparesTCMandWesternmedicinebysaying"TCMtreatstherootwhileWesternmedicinetreatsthesymptoms".Thissentenceisanexampleof______.A.afactualstatementaboutmedicalpracticesB.acomparisonbetweentwosystemsC.anopinionaboutwhichmedicineisbetterD.ahistoricalaccountofmedicaldevelopment（解析：本题考查单元重点语法“比较结构”。第7单元涉及中西方文化对比，该句明确使用“while”进行对比，故B项正确。A项“陈述事实”未涵盖对比关系；C项“主观评价”与原文客观性不符；D项“历史叙述”未在文中体现。该题难度中等，需识别单元核心语法功能。）5.Thepassage"TheImportanceofReading"statesthat"readingbroadensourhorizons".Thissentenceuses______toexplainthebenefitofreading.A.adirectstatementoffactB.anexampletoillustratetheideaC.acause-and-effectrelationshipD.ananalogytomaketheconceptclearer（解析：本题考查单元重点修辞“解释手法”。第7单元强调阅读的抽象益处，该句直接说明因果关系，故C项正确。A项“直接陈述”未体现逻辑关系；B项“举例”未在文中出现；D项“类比”未使用。该题难度中等，需结合单元抽象概念理解解释方式。）6.Inthepassage"TheRoleofTechnologyinEducation",theauthormentionsthat"virtualrealitycanenhancelearningexperiences".Thissentenceuses______todescribetheeffectoftechnology.A.ageneralstatementabouttechnologyB.aspecificexampleofitsapplicationC.asubjectiveopinionaboutitsbenefitsD.ahistoricaldevelopmentofeducationaltools（解析：本题考查单元重点词汇“virtualreality”的语境应用。第7单元强调科技具体应用，该句明确指出具体效果，故B项正确。A项“泛指科技”过于宽泛；C项“主观评价”与原文客观性不符；D项“历史发展”未在文中体现。该题难度中等，需结合单元科技主题分析。）7.Thepassage"TheBenefitsofExercise"statesthat"regularphysicalactivityimprovesmentalhealth".Thissentenceuses______toexplaintheconnectionbetweenphysicalandmentalwell-being.A.ascientifictheoryabouthumanhealthB.apersonalanecdotetoillustratethepointC.alogicalcause-and-effectrelationshipD.astatisticalanalysisofhealthdata（解析：本题考查单元重点语法“因果关系”。第7单元强调健康知识，该句明确说明因果联系，故C项正确。A项“科学理论”未在文中出现；B项“个人经历”未在文中体现；D项“数据分析”未使用。该题难度中等，需识别单元核心逻辑关系。）8.Inthepassage"TheHistoryoftheInternet",theauthormentionsthat"theinternetwasoriginallydevelopedformilitarypurposes".Thissentenceprovides______toexplainitsorigins.A.apersonalopinionaboutitscreatorsB.afactualstatementaboutitsdevelopmentC.aspeculativetheoryaboutitspurposeD.acomparisonwithothercommunicationtechnologies（解析：本题考查单元重点词汇“militarypurposes”的语境含义。第7单元强调历史事实，该句直接陈述背景，故B项正确。A项“个人观点”与原文客观性不符；C项“推测理论”未在文中体现；D项“技术对比”未在文中出现。该题难度中等，需结合单元历史主题分析。）9.Thepassage"TheImportanceofLanguageLearning"statesthat"learninganewlanguageopensdoorstodifferentcultures".Thissentenceuses______toexplainthebenefitoflanguagelearning.A.adirectstatementoffactB.ananalogytodescribeculturalexposureC.acause-and-effectrelationshipD.apersonalexperiencetoillustratethepoint（解析：本题考查单元重点修辞“类比手法”。第7单元强调文化多样性，该句用“开门”比喻文化交流，故B项正确。A项“直接陈述”未体现比喻；C项“因果关系”未在文中体现；D项“个人经历”未在文中出现。该题难度中等，需识别单元核心修辞。）10.Inthepassage"TheImpactofClimateChangeonAgriculture",theauthormentionsthat"cropyieldsaredecliningduetoextremeweatherconditions".Thissentenceuses______toexplaintheproblem.A.ageneralstatementaboutclimatechangeB.aspecificexampleofitseffectonagricultureC.asubjectiveopinionaboutitsseverityD.ahistoricalcomparisonofpastandpresentyields（解析：本题考查单元重点词汇“cropyields”的语境应用。第7单元强调具体影响，该句明确指出具体后果，故B项正确。A项“泛指气候变化”过于宽泛；C项“主观评价”与原文客观性不符；D项“历史对比”未在文中体现。该题难度中等，需结合单元具体主题分析。）1.Inthepassage"TheBenefitsofVolunteering",theauthormentionsthat"volunteeringcanimprovementalhealth________stressandanxiety".（参考答案：byreducing）（解析：本题考查单元重点词汇“reducestress”。第7单元强调心理健康，该句使用“bydoingsth”结构说明方式，故填“byreducing”。）2.Thepassage"TheRoleofSocialMediainPolitics"statesthat"socialmediacan________politicalcampaignsbyreachingalargeaudiencequickly".（参考答案：boost）（解析：本题考查单元重点动词“boostcampaigns”。第7单元强调社交媒体作用，该句说明其积极效果，故填“boost”。）3.Inthepassage"TheHistoryoftheOlympicGames",theauthormentionsthat"themodernOlympicswere________in1896byPierredeCoubertin".（参考答案：established）（解析：本题考查单元重点动词“establish”。第7单元涉及历史事件，该句说明创建时间，故填“established”。）4.Thepassage"TheImpactofGlobalWarmingonPolarBears"statesthat"polarbearsarefacing________duetomeltingicehabitats".（参考答案：threats）（解析：本题考查单元重点名词“threats”。第7单元强调生态问题，该句说明生存危机，故填“threats”。）5.Inthepassage"TheBenefitsofReading",theauthormentionsthat"readingcan________ourcriticalthinkingskillsbyexposingustodifferentperspectives".（参考答案：enhance）（解析：本题考查单元重点动词“enhanceskills”。第7单元强调阅读能力，该句说明提升效果，故填“enhance”。）6.Thepassage"TheRoleofTechnologyinEducation"statesthat"virtualrealitycan________learningexperiencesbysimulatingreal-worldscenarios".（参考答案：improve）（解析：本题考查单元重点动词“improveexperiences”。第7单元强调科技应用，该句说明效果，故填“improve”。）7.Inthepassage"TheImportanceofLanguageLearning",theauthormentionsthat"learninganewlanguagecan________culturalunderstandingbyallowingustocommunicatewithothers".（参考答案：promote）（解析：本题考查单元重点动词“promoteunderstanding”。第7单元强调文化交流，该句说明作用，故填“promote”。）8.Thepassage"TheHistoryoftheInternet"statesthat"theinternetwasoriginally________formilitarypurposesbeforebecomingapublicresource".（参考答案：developed）（解析：本题考查单元重点动词“developfor”。第7单元涉及科技发展，该句说明初始目的，故填“developed”。）9.Inthepassage"TheImpactofClimateChangeonAgriculture",theauthormentionsthat"cropyieldsaredeclining________toextremeweatherconditionsandsoildegradation".（参考答案：dueto）（解析：本题考查单元重点介词“dueto”。第7单元强调农业问题，该句说明原因，故填“dueto”。）10.Thepassage"TheBenefitsofExercise"statesthat"regularphysicalactivitycan________cardiovascularhealthbystrengtheningtheheartandimprovingcirculation".（参考答案：improve）（解析：本题考查单元重点动词“improvehealth”。第7单元强调健康知识，该句说明效果，故填“improve”。）1.Thepassage"TheBenefitsofVolunteering"statesthat"volunteeringcanimprovementalhealthbyreducingstressandanxiety".Thissentenceusesacause-and-effectrelationshiptoexplainthebenefitsofvolunteering.（参考答案：正确）（解析：该句明确说明“byreducingstress”是“improvementalhealth”的方式，符合因果关系，故正确。）2.Thepassage"TheRoleofSocialMediainPolitics"mentionsthat"socialmediacanboostpoliticalcampaignsbyreachingalargeaudiencequickly".Thissentenceusesametaphortodescribetheeffectofsocialmedia.（参考答案：错误）（解析：该句使用“boost”直接说明效果，未使用比喻，故错误。）3.Thepassage"TheHistoryoftheOlympicGames"statesthat"themodernOlympicswereestablishedin1896byPierredeCoubertin".ThissentenceprovidesafactualstatementabouttheoriginsoftheOlympics.（参考答案：正确）（解析：该句直接陈述历史事件，符合事实性描述，故正确。）4.Thepassage"TheImpactofGlobalWarmingonPolarBears"mentionsthat"polarbearsarefacingthreatsduetomeltingicehabitats".Thissentenceusesarhetoricalquestiontoemphasizetheproblem.（参考答案：错误）（解析：该句直接陈述威胁，未使用反问句，故错误。）5.Thepassage"TheBenefitsofReading"statesthat"readingcanenhanceourcriticalthinkingskillsbyexposingustodifferentperspectives".Thissentenceusesananalogytoexplainthebenefitofreading.（参考答案：错误）（解析：该句直接说明提升效果，未使用类比，故错误。）6.Thepassage"TheRoleofTechnologyinEducation"mentionsthat"virtualrealitycanimprovelearningexperiencesbysimulatingreal-worldscenarios".ThissentenceusesstatisticstoprovideevidencefortheeffectivenessofVR.（参考答案：错误）（解析：该句直接说明效果，未使用数据，故错误。）7.Thepassage"TheImportanceofLanguageLearning"statesthat"learninganewlanguagecanpromoteculturalunderstandingbyallowingustocommunicatewithothers".Thissentenceusesapersonalanecdotetoillustratethepoint.（参考答案：错误）（解析：该句直接说明作用，未使用个人经历，故错误。）8.Thepassage"TheHistoryoftheInternet"mentionsthat"theinternetwasoriginallydevelopedformilitarypurposesbeforebecomingapublicresource".Thissentenceprovidesahistoricalcomparisontoexplainitsdevelopment.（参考答案：错误）（解析：该句直接陈述历史背景，未进行对比，故错误。）9.Thepassage"TheImpactofClimateChangeonAgriculture"statesthat"cropyieldsaredecliningduetoextremeweatherconditionsandsoildegradation".Thissentenceusesalogicalcause-and-effectrelationshiptoexplaintheproblem.（参考答案：正确）（解析：该句明确说明原因和结果，符合因果关系，故正确。）10.Thepassage"TheBenefitsofExercise"mentionsthat"regularphysicalactivitycanimprovecardiovascularhealthbystrengtheningtheheartandimprovingcirculation".Thissentenceusesemotionallanguagetodescribethebenefitsofexercise.（参考答案：错误）（解析：该句直接说明效果，未使用情感化表达，故错误。）1.Accordingtothepassage"TheBenefitsofVolunteering",howdoesvolunteeringimprovementalhealth?（参考答案：Volunteeringimprovesmentalhealthbyreducingstressandanxiety.Whenpeoplehelpothers,theyoftenexperienceasenseoffulfillmentandpurpose,whichcanboosttheirmoodandoverallwell-being.Additionally,volunteeringprovidessocialinteraction,whichcancombatlonelinessandimprovementalhealth.）（解析：本题考查单元核心概念“mentalhealth”。第7单元强调心理益处，答案需结合“reducestress”和“socialinteraction”两个关键点，说明具体机制。）2.Inthepassage"TheRoleofSocialMediainPolitics",whatisthemainpurposeofsocialmediainpoliticalcampaigns?（参考答案：Themainpurposeofsocialmediainpoliticalcampaignsistoreachalargeaudiencequicklyandengagevoters.Socialmediaplatformsallowpoliticalcandidatestosharetheirmessages,policies,andactivitieswithmillionsofpeoplesimultaneously.Thisdirectcommunicationcanincreasevisibility,mobilizesupport,andinfluencepublicopinion.）（解析：本题考查单元核心概念“socialmedia”。第7单元强调其传播作用，答案需结合“reachaudience”和“engagevoters”两个关键点，说明具体功能。）3.Accordingtothepassage"TheHistoryoftheOlympicGames",whywerethemodernOlympicsestablishedin1896?（参考答案：ThemodernOlympicswereestablishedin1896byPierredeCoubertintopromoteinternationalunderstandingandpeacethroughsports.Atthetime,EuropewasrecoveringfromtheFranco-PrussianWar,andCoubertinbelievedthattheOlympicscouldbringtogetherpeoplefromdifferentcountriesinaspiritoffriendlycompetition.ThefirstmodernOlympicswereheldinAthens,Greece,in1896,andtheymarkedthebeginningofaneweraininternationalsports.）（解析：本题考查单元核心概念“Olympics”。第7单元强调历史背景，答案需结合“internationalunderstanding”和“peace”两个关键点，说明创建目的。）4.Inthepassage"TheImpactofGlobalWarmingonPolarBears",whatarethemainthreatsfacingpolarbearsduetoclimatechange?（参考答案：Themainthreatsfacingpolarbearsduetoclimatechangeincludemeltingicehabitatsandreducedfoodavailability.Polarbearsrelyonseaicetohuntseals,theirprimaryfoodsource.Astheicemelts,polarbearshavelessaccesstofood,whichcanleadtomalnutritionandlowersurvivalrates.Additionally,thelossoficeaffectstheirabilitytotravelandfindmates,furtherthreateningtheirpopulation.）（解析：本题考查单元核心概念“polarbears”。第7单元强调生态问题，答案需结合“meltingice”和“foodavailability”两个关键点，说明具体威胁。）5.Accordingtothepassage"TheBenefitsofReading",howdoesreadingenhancecriticalthinkingskills?（参考答案：Readingenhancescriticalthinkingskillsbyexposingustodifferentperspectivesandchallengingideas.Whenweread,weencountervariousviewpoints,arguments,andevidence,whichencouragesustoanalyze,evaluate,andquestioninformation.Thisprocesshelpsusdeveloplogicalreasoning,problem-solvingabilities,andadeeperunderstandingofcomplexissues.）（解析：本题考查单元核心概念“criticalthinking”。第7单元强调阅读能力，答案需结合“differentperspectives”和“analyzeinformation”两个关键点，说明具体机制。）6.Inthepassage"TheRoleofTechnologyinEducation",howdoesvirtualrealityimprovelearningexperiences?（参考答案：Virtualrealityimproveslearningexperiencesbysimulatingreal-worldscenariosandprovidingimmersive,interactiveenvironments.Studentscanexplorevirtualworlds,conductexperiments,andpracticeskillsinasafeandcontrolledsetting.Thishands-onapproachmakeslearningmoreengaging,memorable,andeffective,especiallyforsubjectslikescience,history,andgeography.）（解析：本题考查单元核心概念“virtualreality”。第7单元强调科技应用，答案需结合“immersiveenvironment”和“hands-onlearning”两个关键点，说明具体效果。）7.Accordingtothepassage"TheImportanceofLanguageLearning",whyisculturalunderstandingimportantintoday'sglobalizedworld?（参考答案：Culturalunderstandingisimportantintoday'sglobalizedworldbecauseitpromotestolerance,reducesconflicts,andenhancescooperation.Whenpeopleunderstanddifferentcultures,theycanappreciatediversity,avoidstereotypes,andbuildstrongerrelationships.Thisisessentialforinternationaldiplomacy,business,andsocialharmony.）（解析：本题考查单元核心概念“culturalunderstanding”。第7单元强调文化交流，答案需结合“tolerance”和“cooperation”两个关键点，说明具体意义。）8.Inthepassage"TheHistoryoftheInternet",whatweretheinitialpurposesoftheinternetbeforeitbecameapublicresource?（参考答案：Beforebecomingapublicresource,theinternetwasinitiallydevelopedformilitarypurposes,suchascommunicationanddatasharingamonggovernmentagencies.Itwasdesignedtobeasecureandreliablenetworkthatcouldwithstandattacksandmaintainconnectivityevenifpartsoftheinfrastructureweredamaged.Overtime,theinternetevolvedfromamilitarytoolintoaglobalresourceforeducation,business,andpersonaluse.）（解析：本题考查单元核心概念“internet”。第7单元强调科技发展，答案需结合“militarypurposes”和“securenetwork”两个关键点，说明初始功能。）1.Readthefollowingpassageandfillintheblankswithappropriatewordsfromthebox.Eachwordcanbeusedonlyonce.Thepassage:"TheBenefitsofRecycling"statesthat"recyclingcan________wasteand________naturalresources.Whenwerecycle,wereducetheamountoftrashsenttolandfills,which________spaceandpollution.Additionally,recyclinghelpstoconserveresourcesliketrees,water,andenergy,whichare________forourenvironment."Box:-reduce-protect-save-create-preserve-generate（参考答案：reduce,preserve,create,protect）（解析：本题考查单元核心概念“recycling”。第7单元强调环保知识，答案需结合“reducewaste”和“preserveresources”两个关键点，说明具体作用。）2.Readthefollowingpassageandfillintheblankswithappropriatewordsfromthebox.Eachwordcanbeusedonlyonce.Thepassage:"TheRoleofSocialMediainEducation"mentionsthat"socialmediacan________learningbyprovidingaccesstoinformationand________collaborationamongstudents.Whenstudentsusesocialmediaplatformsforeducationalpurposes,theycan________knowledge,shareresources,and________eachother'sideas."Box:-enhance-promote-support-facilitate-encourage-develop（参考答案：enhance,facilitate,develop,encourage）（解析：本题考查单元核心概念“socialmedia”。第7单元强调教育应用，答案需结合“enhancelearning”和“facilitatecollaboration”两个关键点，说明具体功能。）3.Readthefollowingpassageandfillintheblankswithappropriatewordsfromthebox.Eachwordcanbeusedonlyonce.Thepassage:"TheImpactofClimateChangeonAgriculture"statesthat"climatechangecan________cropyieldsbycausingextremeweatherconditionsand________soilquality.Farmersfacechallengessuchasdroughts,floods,andheatwaves,whichcan________theirabilitytoproducefood.Additionally,climatechangecan________pestsanddiseases,furtherthreateningagriculturalproductivity."Box:-reduce-affect-increase-damage-improve-spread（参考答案：reduce,damage,affect,spread）（解析：本题考查单元核心概念“climatechange”。第7单元强调农业问题，答案需结合“reduceyields”和“damagesoil”两个关键点，说明具体影响。）4.Readthefollowingpassageandfillintheblankswithappropriatewordsfromthebox.Eachwordcanbeusedonlyonce.Thepassage:"TheBenefitsofExercise"mentionsthat"regularphysicalactivitycan________cardiovascularhealthbystrengtheningtheheartand________circulation.Exercisealsohelpsto________stress,improvemood,andenhanceoverallwell-being.Additionally,itcan________theriskofchronicdiseasessuchasdiabetesandheartdisease."Box:-boost-improve-reduce-increase-maintain-lower（参考答案：boost,improve,reduce,lower）（解析：本题考查单元核心概念“exercise”。第7单元强调健康知识，答案需结合“boosthealth”和“reducestress”两个关键点，说明具体效果。）5.Readthefollowingpassageandfillintheblankswithappropriatewordsfromthebox.Eachwordcanbeusedonlyonce.Thepassage:"TheImportanceofLanguageLearning"statesthat"learninganewlanguagecan________cognitiveskillsbyimprovingmemoryandproblem-solvingabilities.Whenstudentsstudyaforeignlanguage,theycan________theirbrain'splasticity,whichhelpsthemlearnandadaptmoreeffectively.Additionally,languagelearningcan________culturalunderstandingbyallowingthemtocommunicatewithpeoplefromdifferentbackgrounds."Box:-enhance-develop-promote-improve-increase-foster（参考答案：enhance,develop,foster）（解析：本题考查单元核心概念“languagelearning”。第7单元强调学习益处，答案需结合“enhancecognitiveskills”和“fosterculturalunderstanding”两个关键点，说明具体作用。）6.Readthefollowingpassageandfillintheblankswithappropriatewordsfromthebox.Eachwordcanbeusedonlyonce.Thepassage:"TheRoleofTechnologyinEducation"mentionsthat"technologycan________learningexperiencesbyprovidinginteractiveandengagingcontent.Whenstudentsusedigitaltoolssuchasvirtualrealityandeducationalapps,theycan________knowledgeinamoredynamicway.Additionally,technologycan________collaborationbyallowingstudentstoworktogetheronprojectsandshareideasonline."Box:-transform-improve-facilitate-support-enhance-promote（参考答案：transform,enhance,facilitate）（解析：本题考查单元核心概念“technology”。第7单元强调教育应用，答案需结合“transformlearning”和“facilitatecollaboration”两个关键点，说明具体功能。）7.Readthefollowingpassageandfillintheblankswithappropriatewordsfromthebox.Eachwordcanbeusedonlyonce.Thepassage:"TheImpactofClimateChangeonWildlife"statesthat"climatechangecan________wildlifepopulationsbyalteringtheirhabitatsand________foodsources.Manyspeciesarestrugglingtoadapttochangingtemperaturesandweatherpatterns,whichcan________theirsurvivalrates.Additionally,climatechangecan________thespreadofdiseases,furtherthreateningbiodiversity."Box:-reduce-affect-increase-damage-improve-spread（参考答案：reduce,affect,damage,spread）（解析：本题考查单元核心概念“climatechange”。第7单元强调生态问题，答案需结合“reducepopulations”和“damagehabitats”两个关键点，说明具体影响。）8.Readthefollowingpassageandfillintheblankswithappropriatewordsfromthebox.Eachwordcanbeusedonlyonce.Thepassage:"TheBenefitsofVolunteering"mentionsthat"volunteeringcan________socialskillsbyprovidingopportunitiestointeractwithothers.Whenpeoplevolunteer,theycan________newfriendships,learnnewskills,and________theircommunity.Additionally,volunteeringcan________personalgrowthbyhelpingindividualsdevelopasenseofpurposeandresponsibility."Box:-improve-develop-enhance-foster-promote-increase（参考答案：enhance,develop,foster,promote）（解析：本题考查单元核心概念“volunteering”。第7单元强调社会益处，答案需结合“enhancesocialskills”和“fostercommunity”两个关键点，说明具体作用。）【标准答案及解析】一、单项选择题1.B2.B3.A4.B5.B6.B7.C8.B9.B10.B二、填空题1.byreducing2.boost3.established4.threats5.enhance6.improve7.promote8.developed9.dueto10.improve三、判断题1.正确2.错误3.正确4.错误5.错误6.错误7.错误8.错误9.正确10.错误四、简答题1.参考答案：Volunteeringimprovesmentalhealthbyreducingstressandanxiety.Whenpeoplehelpothers,theyoftenexperienceasenseoffulfillmentandpurpose,whichcanboosttheirmoodandoverallwell-being.Additionally,volunteeringprovidessocialinteraction,whichcancombatlonelinessandimprovementalhealth.解析：本题考查单元核心概念“mentalhealth”。第7单元强调心理益处，答案需结合“reducestress”和“socialinteraction”两个关键点，说明具体机制。）2.参考答案：Themainpurposeofsocialmediainpoliticalcampaignsistoreachalargeaudiencequicklyandengagevoters.Socialmediaplatformsallowpoliticalcandidatestosharetheirmessages,policies,andactivitieswithmillionsofpeoplesimultaneously.Thisdirectcommunicationcanincreasevisibility,mobilizesupport,andinfluencepublicopinion.解析：本题考查单元核心概念“socialmedia”。第7单元强调其传播作用，答案需结合“reachaudience”和“engagevoters”两个关键点，说明具体功能。）3.参考答案：ThemodernOlympicswereestablishedin1896byPierredeCoubertintopromoteinternationalunderstandingandpeacethroughsports.Atthetime,EuropewasrecoveringfromtheFranco-PrussianWar,andCoubertinbelievedthattheOlympicscouldbringtogetherpeoplefromdifferentcountriesinaspiritoffriendlycompetition.ThefirstmodernOlympicswereheldinAthens,Greece,in1896,andtheymarkedthebeginningofaneweraininternationalsports.解析：本题考查单元核心概念“Olympics”。第7单元强调历史背景，答案需结合“internationalunderstanding”和“peace”两个关键点，说明创建目的。）4.参考答案：Themainthreatsfacingpolarbearsduetoclimatechangeincludemeltingicehabitatsandreducedfoodavailability.Polarbearsrelyonseaicetohuntseals,theirprimaryfoodsource.Astheicemelts,polarbearshavelessaccesstofood,whichcanleadtomalnutritionandlowersurvivalrates.Additionally,thelossoficeaffectstheirabilitytotravelandfindmates,furtherthreateningtheirpopulation.解析：本题考查单元核心概念“polarbears”。第7单元强调生态问题，答案需结合“meltingice”和“foodavailability”两个关键点，说明具体威胁。）5.参考答案：Readingenhancescriticalthinkingskillsbyexposingustodifferentperspectivesandchallengingideas.Whenweread,weencountervariousviewpoints,arguments,andevidence,whichencouragesustoanalyze,evaluate,andquestioninformation.Thisprocesshelpsusdeveloplogicalreasoning,problem-solvingabilities,andadeeperunderstandingofcomplexissues.解析：本题考查单元核心概念“criticalthinking”。第7单元强调阅读能力，答案需结合“differentperspectives”和“analyzeinformation”两个关键点，说明具体机制。）6.参考答案：Virtu