高二英语上学期期末真题分类汇编《阅读理解之说明文》（含答案）

高二英语上学期期末真题分类汇编《阅读理解之说明文》（含答案）前言本文汇编了高二英语上学期期末统考中高频出现的阅读理解说明文题型，精选不同主题（科技、文化、健康、环境、生活常识）的真题，贴合高二英语教学重点和考试难度。每篇真题后附详细解析及标准答案，解析侧重说明文阅读技巧（定位关键信息、梳理说明顺序、理解说明方法），帮助学生针对性突破说明文阅读难点，巩固高频考点，提升应试能力。所有真题均贴合高二上学期所学词汇、语法范围，兼顾基础性与综合性，适合期末专项复习使用。第一部分真题汇编（共8篇，分主题呈现）主题一：科技类说明文（高频考点）Passage1（真题改编，贴合高二考情）Haveyoueverwonderedhowyoursmartphoneknowsyourlocation,orhowmapscanguideyoutoanewplace?TheanswerliesinGPS,orGlobalPositioningSystem.GPSisasatellite-basednavigationsystemthathelpsusersdeterminetheirexactlocationonEarth.ItwasfirstdevelopedbytheUSDepartmentofDefenseinthe1970sformilitaryuse,buttodayitiswidelyusedineverydaylife.AGPSsystemconsistsofthreemainparts:satellites,groundstations,andreceivers.Thereareabout30GPSsatellitesorbitingtheEarthatanaltitudeofabout20,000kilometers.Thesesatellitessendoutsignalsthatcontaininformationabouttheirpositionandthecurrenttime.Groundstationsmonitorandcontrolthesatellites,makingsuretheyworkproperly.Receivers,suchasyoursmartphoneorcarGPS,pickupsignalsfromatleastfoursatellites.Bycalculatingthetimeittakesforthesignalstoreachthereceiver,theGPScandeterminetheuser’slatitude,longitude,andaltitude.GPShasmanypracticaluses.ItisusedinnavigationappslikeGoogleMapsandBaiduMaps,helpingpeoplefindtheirway.Itisalsousedinagriculturetoguidetractorsandmonitorcropgrowth.Inaddition,GPSplaysanimportantroleinemergencyservices,allowingrescuerstoquicklylocatepeopleindanger.EvenweatherforecastersuseGPStotrackstormsandpredictweatherchanges.However,GPSisnotperfect.Itcanbeaffectedbybadweather,suchasheavyrainorsnow,whichcanweakenthesignals.Itcanalsobeblockedbytallbuildingsormountains.Despitetheselimitations,GPShasbecomeanessentialpartofmodernlife,makingourdailyactivitieseasierandmoreconvenient.Questions:1.Whatisthemainpurposeofthepassage?

A.ToexplainhowGPSworksanditsuses.

B.TointroducethehistoryofGPS.

C.TodiscussthelimitationsofGPS.

D.TocompareGPSwithothernavigationsystems.2.WhichofthefollowingisNOTapartoftheGPSsystem?

A.Satellites.

B.Groundstations.

C.Receivers.

D.Weatherstations.3.WhydoGPSreceiversneedsignalsfromatleastfoursatellites?

A.Toensurethesignalsarestrongenough.

B.Tocalculatetheuser’sexactlocation.

C.Toavoidbeingaffectedbybadweather.

D.Toconnecttogroundstations.4.Whatcanweinferfromthepassage?

A.GPSwasoriginallydesignedforcivilianuse.

B.GPSsignalscanpassthroughtallbuildingseasily.

C.GPSiswidelyusedindifferentfields.

D.GPSwillsoonbereplacedbyanewsystem.Passage2（真题改编，贴合高二考情）Artificialintelligence(AI)ischangingtheworldinmanyways.FromvoiceassistantslikeSiriandAlexatoself-drivingcars,AIisbecominganimportantpartofourdailylives.ButwhatexactlyisAI?AIreferstotheabilityofmachinestoperformtasksthatusuallyrequirehumanintelligence,suchaslearning,reasoning,andproblem-solving.TherearetwomaintypesofAI:narrowAIandgeneralAI.NarrowAI,alsoknownasweakAI,isdesignedtoperformaspecifictask.Forexample,voiceassistantscanunderstandandrespondtohumanspeech,buttheycannotdoanythingelse.GeneralAI,ontheotherhand,isatypeofAIthathasthesamelevelofintelligenceashumans.Itcanlearnanytaskthatahumancando,butitdoesnotyetexistandisstillatopicofresearch.AIisbeingusedinmanyfields.Inhealthcare,AIcanhelpdoctorsdiagnosediseasesmoreaccurately.Forexample,AIsystemscananalyzemedicalimagesanddetectcanceratanearlystage.Ineducation,AIcanpersonalizelearningforstudents,adaptingtotheirlearningspeedandneeds.Inbusiness,AIcanhelpcompaniesanalyzedataandmakebetterdecisions.Itcanalsoautomaterepetitivetasks,savingtimeandmoney.However,AIalsobringssomechallenges.Oneofthebiggestconcernsisjobloss.AsAIautomatesmoretasks,somejobsmaybereplacedbymachines.Anotherconcernisprivacy.AIsystemscollectalotofdataaboutusers,whichmaybemisused.Despitethesechallenges,AIhasgreatpotentialtoimproveourlivesandsolvemanyoftheworld’sproblems.Questions:1.Whatisthebesttitleforthepassage?

A.TheHistoryofAI

B.WhatisAIandItsApplications

C.TheChallengesofAI

D.TheFutureofAI2.WhichofthefollowingisanexampleofnarrowAI?

A.Aself-drivingcarthatcanhandleanyroadcondition.

B.Avoiceassistantthatcananswerquestions.

C.Amachinethatcanlearnanyhumantask.

D.Arobotthatcanthinklikeahuman.3.HowisAIusedinhealthcare?

A.Itcanreplacedoctorscompletely.

B.Itcanhelpdiagnosediseasesmoreaccurately.

C.Itcanperformsurgeryonpatients.

D.Itcandevelopnewdrugs.4.WhatisamajorconcernaboutAI?

A.Itistooexpensivetodevelop.

B.Itcannotperformcomplextasks.

C.Itmayleadtojobloss.

D.Itisdifficulttocontrol.主题二：文化类说明文Passage3（真题改编，贴合高二考情）Teaisoneofthemostpopulardrinksintheworld.Itisenjoyedbypeopleinalmosteverycountry,andithasahistoryofmorethan4,000years.TheoriginofteacanbetracedbacktoancientChina,whereitwasfirstusedasamedicinebeforebecomingadrink.Therearemanydifferenttypesoftea,includinggreentea,blacktea,oolongtea,andwhitetea.Thedifferencebetweenthesetypesoftealiesintheprocessingmethod.Greenteaismadebysteamingorpan-fryingfreshtealeaves,whichkeepsitsgreencolorandfreshflavor.Blackteaisfermented,whichgivesitadarkcolorandastrongtaste.Oolongteaispartiallyfermented,combiningthecharacteristicsofgreenteaandblacktea.Whiteteaismadefromyoungtealeavesandbuds,whicharedriednaturallywithoutanyprocessing.Teanotonlytastesgoodbutalsohasmanyhealthbenefits.Itcontainsantioxidants,whichcanhelpprotectthebodyfromdamagecausedbyfreeradicals.Drinkingteacanalsohelpreducestress,improvedigestion,andboosttheimmunesystem.Insomecultures,teaisalsoanimportantpartofsociallife.Forexample,inChina,thereisatraditionalteaceremonythatisasymbolofpolitenessandrespect.InBritain,afternoonteaisapopulartradition,wherepeoplegathertodrinkteaandeatsnacks.Today,teaisgrowninmanycountriesaroundtheworld,includingIndia,Japan,SriLanka,andKenya.Eachcountryhasitsownuniqueteacultureandwayofmakingtea.Nomatterwhereyougo,acupofteaisagreatwaytorelaxandconnectwithothers.Questions:1.Wheredidteaoriginate?

A.India.

B.China.

C.Japan.

D.Britain.2.Whatisthemaindifferencebetweendifferenttypesoftea?

A.Theplacewheretheyaregrown.

B.Thetimewhentheyarepicked.

C.Theprocessingmethod.

D.Thecolorofthetealeaves.3.WhichofthefollowingisNOTahealthbenefitoftea?

A.Itcontainsantioxidants.

B.Ithelpsreducestress.

C.Itimprovesdigestion.

D.Itcuresalldiseases.Whatcanwelearnfromthepassage?

A.TeawasfirstusedasadrinkinancientChina.

B.Whiteteaisfermented.

C.AfternoonteaisatraditioninChina.

D.Teaisgrowninmanycountriesaroundtheworld.主题三：健康类说明文Passage4（真题改编，贴合高二考情）Gettingenoughsleepisessentialforgoodhealth.Sleepisnotjustatimewhenourbodiesrest;itisalsoatimewhenourbrainsprocessinformation,repaircells,andstrengthenmemories.However,manypeopletodaydonotgetenoughsleep,whichcanhaveanegativeimpactontheirphysicalandmentalhealth.Theamountofsleepweneedvariesdependingonourage.Teenagersbetween13and19yearsoldneed8to10hoursofsleeppernight.Adultsneed7to9hours,whileolderadultsneed7to8hours.Unfortunately,manyteenagersstayuplateplayinggames,watchingvideos,orstudying,whichleavesthemtiredandsleepyduringtheday.Lackofsleepcancausemanyproblems.Itcanaffectourmood,makingusfeelirritable,anxious,ordepressed.Itcanalsoaffectourabilitytoconcentrateandlearn,whichisespeciallybadforstudents.Inaddition,long-termlackofsleepcanincreasetheriskofserioushealthproblems,suchasobesity,diabetes,andheartdisease.Itcanalsoweakentheimmunesystem,makingusmorelikelytogetsick.Togetagoodnight’ssleep,therearesomesimpletipsyoucanfollow.First,establisharegularsleepschedule.Gotobedandwakeupatthesametimeeveryday,evenonweekends.Second,createacomfortablesleepenvironment.Keepyourbedroomdark,quiet,andcool.Third,avoidusingelectronicdevicesbeforebed,asthebluelightfromthesedevicescaninterferewithsleep.Finally,avoiddrinkingcoffee,tea,orenergydrinksintheevening,astheycankeepyouawake.Questions:1.Whatisthemainideaofthepassage?

A.Theimportanceofsleepandhowtogetenoughsleep.

B.Thedifferentamountsofsleeppeopleneed.

C.Theproblemscausedbylackofsleep.

D.Thebenefitsofaregularsleepschedule.2.Howmuchsleepdoteenagersneedpernight?

A.7to8hours.

B.7to9hours.

C.8to10hours.

D.9to11hours.3.Whichofthefollowingisaproblemcausedbylackofsleep?

A.Improvedconcentration.

B.Irritablemood.

C.Strongerimmunesystem.

D.Reducedriskofdiabetes.4.Whatshouldyoudotogetagoodnight’ssleep?

A.Stayuplateonweekends.

B.Useelectronicdevicesbeforebed.

C.Keepyourbedroombrightandnoisy.

D.Avoiddrinkingcoffeeintheevening.主题四：环境类说明文Passage5（真题改编，贴合高二考情）Plasticpollutionhasbecomeaseriousenvironmentalproblem.Everyyear,millionsoftonsofplasticareproducedaroundtheworld,andalargeamountofitendsupintheoceans,rivers,andlandfills.Plasticisnotbiodegradable,whichmeansitdoesnotbreakdownnaturallyovertime.Thiscanhaveaharmfulimpactonwildlifeandtheenvironment.Plasticpollutionaffectsmarinelifethemost.Manyseaanimals,suchasturtles,fish,andseabirds,mistakeplasticforfoodandeatit.Thiscancausethemtochoke,starve,ordiefrompoisoning.Plasticalsodamagescoralreefs,whicharehometomanymarinespecies.Inaddition,plasticpollutioncancontaminatewaterandsoil,affectingthehealthofplantsandanimalsonland.Thereareseveralwaystoreduceplasticpollution.First,wecanreducetheuseofsingle-useplastics,suchasplasticbags,bottles,andstraws.Instead,wecanusereusableitems,likeclothbags,glassbottles,andmetalstraws.Second,wecanrecycleplasticwaste.Manytypesofplasticcanberecycledandmadeintonewproducts.Third,wecanraiseawarenessaboutplasticpollutionandencourageotherstotakeaction.Governmentscanalsoplayarolebymakinglawstolimittheuseofsingle-useplastics.Plasticpollutionisaglobalproblemthatrequireseveryone’shelp.Bymakingsmallchangesinourdailylives,wecanreduceplasticwasteandprotecttheenvironmentforfuturegenerations.Questions:1.Whatisthemainproblemcausedbyplastic?

A.Itistooexpensivetoproduce.

B.Itisnotbiodegradableandcausespollution.

C.Itisdifficulttorecycle.

D.Itisharmfultohumanhealthdirectly.2.Howdoesplasticpollutionaffectmarinelife?

A.Marineanimalseatplasticbymistakeandgetharmed.

B.Plastichelpsmarineanimalsfindfood.

C.Plasticimprovesthequalityofoceanwater.

D.Marineanimalsuseplastictobuildtheirhomes.3.Whichofthefollowingisawaytoreduceplasticpollution?

A.Usemoresingle-useplastics.

B.Throwplasticwasteintooceans.

C.Usereusableitemsinsteadofsingle-useplastics.

D.Ignoreplasticpollution.4.Whatistheauthor’sattitudetowardsplasticpollution?

A.Indifferent.

B.Concerned.

C.Optimistic.

D.Doubtful.主题五：生活常识类说明文Passage6（真题改编，贴合高二考情）Washingyourhandsisoneofthesimplestandmosteffectivewaystopreventthespreadofgermsanddiseases.Germsaretinyorganismsthatcancauseillness,andtheycanbeeasilyspreadfrompersontopersonthroughtouch.Bywashingyourhandsregularly,youcanremovegermsfromyourhandsandreducetheriskofgettingsick.Butdoyouknowthecorrectwaytowashyourhands?TheWorldHealthOrganization(WHO)recommendsthefollowingsteps:First,wetyourhandswithclean,runningwater.Second,applyenoughsoaptocoverallsurfacesofyourhands.Third,rubyourhandstogethertocreatelather.Makesuretorubthepalms,backofthehands,betweenthefingers,andunderthenails.Rubforatleast20seconds—aboutthetimeittakestosingthe“HappyBirthday”songtwice.Fourth,rinseyourhandsthoroughlywithclean,runningwater.Finally,dryyourhandswithacleantowelorairdryer.Itisimportanttowashyourhandsatkeytimes,suchasbeforeeating,afterusingthebathroom,aftertouchinganimals,aftercoughingorsneezing,andafterhandlinggarbage.Washingyourhandsatthesetimescanhelppreventthespreadofgermstoyourselfandothers.Inadditiontowashingyourhands,youcanalsousehandsanitizerwhensoapandwaterarenotavailable.Handsanitizershouldcontainatleast60%alcoholtobeeffective.However,handsanitizerisnotareplacementforhandwashing,asitcannotremovealltypesofgerms.Questions:1.Whatisthemainpurposeofthepassage?

A.Toexplainwhyhandwashingisimportantandhowtodoitcorrectly.

B.TointroducetheWorldHealthOrganization(WHO).

C.Tocomparehandwashingwithhandsanitizer.

D.Todiscussthespreadofgerms.2.Howlongshouldyourubyourhandswhenwashingthem?

A.Atleast10seconds.

B.Atleast20seconds.

C.Atleast30seconds.

D.Atleast1minute.3.Whenshouldyouwashyourhands?

A.Onlybeforeeating.

B.Onlyafterusingthebathroom.

C.Atkeytimessuchasbeforeeatingandafterusingthebathroom.

D.Never,ifyouusehandsanitizer.4.Whichofthefollowingistrueabouthandsanitizer?

A.Itcanreplacehandwashing.

B.Itshouldcontainatleast60%alcohol.

C.Itcanremovealltypesofgerms.

D.Itisnoteffectiveatall.Passage7（真题改编，贴合高二考情）Breakfastisoftencalledthemostimportantmealoftheday,andforgoodreason.Afteranightofsleep,yourbodyhasnoteatenanythingfor8to12hours,soitneedsenergytostarttheday.Eatingahealthybreakfastcanprovideyourbodywiththeenergyandnutrientsitneeds,anditcanalsohaveapositiveimpactonyourmoodandperformance.Ahealthybreakfastshouldincludeavarietyofnutrients,suchascarbohydrates,protein,fiber,andvitamins.Carbohydrates,likewhole-grainbread,oats,andfruits,providequickenergy.Protein,suchaseggs,milk,andyogurt,helpskeepyoufulllongerandsupportsmusclegrowth.Fiber,foundinfruits,vegetables,andwholegrains,aidsdigestion.Vitaminsandminerals,likevitaminCandiron,helpkeepyourbodyhealthy.Unfortunately,manypeopleskipbreakfastbecausetheyareinahurryordonotfeelhungry.Skippingbreakfastcanhavenegativeeffects.Itcanmakeyoufeeltiredandirritablethroughouttheday.Itcanalsoleadtoovereatinglaterintheday,whichmaycauseweightgain.Inaddition,skippingbreakfastcanaffectyourconcentrationandabilitytolearn,whichisbadforstudents.Tomakebreakfastapartofyourdailyroutine,youcanpreparesimpleandhealthymealsinadvance.Forexample,youcanmakeovernightoatsthenightbefore,orboileggsandpreparefruitinthemorning.Evenasmallbreakfast,likeabananaandaglassofmilk,isbetterthanskippingitaltogether.Questions:1.Whyisbreakfastcalledthemostimportantmealoftheday?

A.Becauseitisthelargestmealoftheday.

B.Becauseitprovidesenergyafteranightoffasting.

C.Becauseitisthemostdeliciousmeal.

D.Becauseitistheonlymealthatcontainsnutrients.2.WhichofthefollowingisNOTanutrientthatahealthybreakfastshouldinclude?

A.Carbohydrates.

B.Protein.

C.Fiber.

D.Fattyfood.3.Whathappensifyouskipbreakfast?

A.Youwillfeelmoreenergetic.

B.Youwillloseweightquickly.

C.Youmayfeeltiredandirritable.

D.Yourconcentrationwillimprove.4.Whatisasimplewaytomakebreakfastpartofyourroutine?

A.Skipitwhenyouareinahurry.

B.Preparemealsinadvance.

C.Eatalargemealatlunchinstead.

D.Drinkonlycoffeeforbreakfast.Passage8（真题改编，贴合高二考情）Theimportanceofreadingcannotbeoverstated.Readingisnotonlyawaytopasstime;itisalsoawaytogainknowledge,expandyourvocabulary,andimproveyourwritingskills.Whetheryoureadbooks,newspapers,magazines,oronlinearticles,readingcanenrichyourlifeinmanyways.Readinghelpsyougainknowledgeaboutdifferenttopics,suchashistory,science,literature,andculture.Itallowsyoutolearnabouttheworldaroundyouwithoutleavingyourhome.Readingalsohelpsexpandyourvocabulary.Whenyouread,youwillencounternewwordsandlearntheirmeanings,whichcanhelpyoucommunicatemoreeffectively.Inaddition,readingimprovesyourwritingskills.Byreadingwell-writtentexts,youcanlearndifferentwritingstylesandtechniques,whichyoucanapplytoyourownwriting.Readingalsohasmentalbenefits.Itcanhelpreducestressandimproveyourmood.Whenyoureadagoodbook,youcanescapefromthepressuresofdailylifeandenteradifferentworld.Readingalsoexercisesyourbrain,keepingitactiveandsharp.Studieshaveshownthatpeoplewhoreadregularlyhavebettermemoryandcognitiveskillsthanthosewhodonot.Todevelopareadinghabit,youcanstartbychoosingbooksorarticlesthatinterestyou.Youcansetadailyreadinggoal,suchasreadingfor15to30minuteseveryday.Youcanalsojoinabookclubordiscusswhatyoureadwithfriendsandfamily.Bymakingreadingapartofyourdailyroutine,youcanenjoyallthebenefitsithastooffer.Questions:1.Whatisthemainideaofthepassage?

A.Thedifferenttypesofreadingmaterials.

B.Thebenefitsofreadingandhowtodevelopareadinghabit.

C.Howtoimproveyourwritingskills.

D.Thehistoryofreading.2.Howdoesreadinghelpexpandyourvocabulary?

A.Byteachingyougrammarrules.

B.Byallowingyoutoencounternewwords.

C.Byhelpingyouwritebetter.

D.Byreducingstress.3.Whichofthefollowingisamentalbenefitofreading?

A.Gainingknowledgeabouthistory.

B.Expandingvocabulary.

C.Reducingstress.

D.Improvingwritingskills.4.Whatisawaytodevelopareadinghabit?

A.Readonlywhenyouhavealotoftime.

B.Choosematerialsthatinterestyou.

C.Avoiddiscussingwhatyouread.

D.Readfor5hourseveryday.第二部分答案与详细解析Passage1答案与解析1.A解析：主旨大意题。文章第一段介绍GPS的定义和起源，第二段讲解GPS的组成部分及工作原理，第三段介绍GPS的用途，第四段说明GPS的局限性。综合来看，文章主要目的是解释GPS的工作原理及其用途，故选A。B、C选项仅为文章部分内容，D选项文章未提及。2.D解析：细节理解题。根据第二段第一句“AGPSsystemconsistsofthreemainparts:satellites,groundstations,andreceivers.”可知，GPS系统由卫星、地面站和接收器三部分组成，weatherstations（气象站）不属于GPS系统，故选D。3.B解析：细节理解题。根据第二段最后一句“Bycalculatingthetimeittakesforthesignalstoreachthereceiver,theGPScandeterminetheuser’slatitude,longitude,andaltitude.”可知，接收器需要至少四颗卫星的信号，才能计算出用户的准确位置，故选B。4.C解析：推理判断题。根据第三段内容，GPS被用于导航、农业、紧急服务、天气预报等多个领域，可推断出GPS在不同领域被广泛使用，故选C。A选项与第一段“itwasfirstdevelopedbytheUSDepartmentofDefenseinthe1970sformilitaryuse”不符；B选项与第四段“Itcanalsobeblockedbytallbuildingsormountains”不符；D选项文章未提及。Passage2答案与解析1.B解析：主旨大意题。文章第一段介绍AI的定义，第二段区分狭义AI和广义AI，第三段介绍AI的应用领域，第四段说明AI带来的挑战。综合来看，文章主要介绍了AI是什么以及它的应用，故选B。A、C、D选项仅为文章部分内容，不能概括主旨。2.B解析：细节理解题。根据第二段“NarrowAI,alsoknownasweakAI,isdesignedtoperformaspecifictask.Forexample,voiceassistantscanunderstandandrespondtohumanspeech,buttheycannotdoanythingelse.”可知，语音助手是狭义AI的例子，故选B。A、C、D选项均为广义AI的特点，与狭义AI不符。3.B解析：细节理解题。根据第三段“Inhealthcare,AIcanhelpdoctorsdiagnosediseasesmoreaccurately.”可知，AI在医疗领域可帮助医生更准确地诊断疾病，故选B。A选项“completelyreplacedoctors”（完全取代医生）过于绝对，文章未提及；C、D选项文章未提及。4.C解析：细节理解题。根据第四段“Oneofthebiggestconcernsisjobloss.AsAIautomatesmoretasks,somejobsmaybereplacedbymachines.”可知，AI的主要担忧之一是可能导致失业，故选C。A、B、D选项文章未提及。Passage3答案与解析1.B解析：细节理解题。根据第一段“TheoriginofteacanbetracedbacktoancientChina”可知，茶起源于中国，故选B。2.C解析：细节理解题。根据第二段“Thedifferencebetweenthesetypesoftealiesintheprocessingmethod.”可知，不同种类的茶的主要区别在于加工方法，故选C。3.D解析：细节理解题。根据第三段“Teanotonlytastesgoodbutalsohasmanyhealthbenefits.Itcontainsantioxidants...helpreducestress,improvedigestion,andboosttheimmunesystem.”可知，A、B、C选项均为茶的健康益处，D选项“治愈所有疾病”过于绝对，文章未提及，故选D。4.D解析：细节理解题。根据第四段“Today,teaisgrowninmanycountriesaroundtheworld,includingIndia,Japan,SriLanka,andKenya.”可知，茶在世界上许多国家种植，故选D。A选项与第一段“itwasfirstusedasamedicinebeforebecomingadrink”不符；B选项与第二段“Whiteteaismadefromyoungtealeavesandbuds,whicharedriednaturallywithoutanyprocessing”不符；C选项与第三段“InBritain,afternoonteaisapopulartradition”不符。Passage4答案与解析1.A解析：主旨大意题。文章第一段介绍睡眠的重要性，第二段说明不同年龄段的人需要的睡眠时间，第三段讲睡眠不足的危害，第四段给出改善睡眠的建议。综合来看，文章主要讲睡眠的重要性以及如何获得充足的睡眠，故选A。B、C、D选项仅为文章部分内容，不能概括主旨。2.C解析：细节理解题。根据第二段“Teenagersbetween13and19yearsoldneed8to10hoursofsleeppernight.”可知，青少年每晚需要8到10小时的睡眠，故选C。3.B解析：细节理解题。根据第三段“Itcanaffectourmood,makingusfeelirritable,anxious,ordepressed.”可知，睡眠不足会导致情绪易怒，故选B。A、C、D选项均与第三段内容不符。4.D解析：细节理解题。根据第四段“Finally,avoiddrinkingcoffee,tea,orenergydrinksintheevening,astheycankeepyouawake.”可知，为了睡个好觉，应避免晚上喝咖啡，故选D。A、B、C选项均与第四段给出的建议不符。Passage5答案与解析1.B解析：细节理解题。根据第一段“Plasticisnotbiodegradable,whichmeansitdoesnotbreakdownnaturallyovertime.Thiscanhaveaharmfulimpactonwildlifeandtheenvironment.”可知，塑料的主要问题是不可生物降解，会造成污染，故选B。A、C、D选项文章未提及。2.A解析：细节理解题。根据第二段“Manyseaanimals,suchasturtles,fish,andseabirds,mistakeplasticforfoodandeatit.Thiscancausethemtochoke,starve,ordiefrompoisoning.”可知，塑料污染会导致海洋动物误食塑料而受到伤害，故选A。B、C、D选项均与第二段内容不符。3.C解析：细节理解题。根据第三段“First,wecanreducetheuseofsingle-useplastics...Instead,wecanusereusableitems,likeclothbags,glassbottles,andmetalstraws.”可知，使用可重复使用的物品代替一次性塑料是减少塑料污染的方法之一，故选C。A、B、D选项均会加剧塑料污染，与文意不符。4.B解析：推理判断题。文章第一段指出塑料污染是严重的环境问题，第二段讲其危害，第三段给出解决方法，第四段呼吁大家行动起来，可推断出作者对塑料污染持担忧态度，故选B。A（冷漠的）、C（乐观的）、D（怀疑的）均不符合作者态度。Passage6答案与解析1.A解析：主旨大意题。文章第一段介绍洗手的重要性，第二段讲解正确的洗手步骤，第三段说明洗手的关键时间，第四段补充洗手液的使用注意事项。综合来看，文章主要目的是解释洗手的重要性以及如何正确洗手，故选A。B、C、D选