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若函数f（x）＝x2+，则f′（﹣1）＝（ ）
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高二上学期数学《》真题及答案
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已知函数fx=x2-cosx对于上的任意x1x2有如下条件①x1＞x2③|x1|＞x2其中能使fx1
设函数fx＝2sin若对任意x∈R.都有fx1≤fx≤fx2成立则|x1－x2|的最小值为_____
已知函数fx的定义域为R且对任意的实数x导函数f’x满足0＜f’x＜2且f’x≠1．常数c1为
请补充main函数该函数的功能是求方程ax2+bx+c=0的根方程的系数abc从键盘输入例如当a=1
设函数fx=ax3+bx2－3a2x+1ab∈R.在x=x1x=x2处取得极值且|x1－x2|=2.
已知函数fxx∈R满足fx=f2-x若函数y=|x2-2x-3|与y=fx图像的交点为x1y1x2
m
2m
4m
已知函数fx的定义域为R且对任意的实数x导函数f′x满足01若对任意的闭区间［ab］R总存在x0∈
给定程序中函数fun的功能是根据形参i的值返回某个函数的值当调用正确时程序输出x1=5.000000
设x1x2为y＝fx的定义域内的任意两个变量有以下几个命题①x1－x2[fx1－fx2]>0②x1－
对任意的实数x1x2若满足|x1-c1|
定义函数y=fxx∈I若存在常数M.对于任意x1∈I存在唯一的x2∈I使得=M则称函数fx在I.上的
若函数fx满足对于任意x1x2>0都有fx1>0fx2>0且fx1＋fx2
已知函数fxx∈R满足fx=f2-x若函数y=|x2-2x-3|与y=fx图像的交点为x1y1x2
m
2m
4m
已知函数其中a∈R..1若0
设函数fx=xn+bx+cn∈N+bc∈R.1设n≥2b=1c=-1证明:fx在区间1内存在唯一零点
请补充main函数该函数的功能是求方程ax2+bx+c=0的根方程的系数abc从键盘输入例如当a=1
设fx是定义在［-aa］上的任意函数则下列答案中哪个函数不是偶函数
f（x）+f（-x）
f（x）·f（-x）
［f（x）］2
f（x2）
给出以下命题:①函数fx=|log2x2|既无最大值也无最小值;②函数fx=|x2-2x-3|的图象
已知函数fx=x2+ax-lnxa∈R..I.若函数fx在[12]上是减函数求实数a的取值范围II令
已知函数fx＝x2gx＝x－1.1若存在x∈R.使fx
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Eco﹣ResortManagement Ecotourismisoftenregardedasaformofnature﹣basedtourismandhasbecomeanimportantalternativesourceoftourists．Inadditiontoprovidingthetraditionalresort﹣leisureproductithasbeenarguedthatecotourismresort度假村managementshouldhaveaparticularfocusonbest﹣practiceenvironmentalmanagement．CouranCoveResortissuchatouristattractionlocatedonSouthStradbrokeIslandAustralia． Sustainable可持续的PracticesofCouranCoveResort SouthStradbrokeIslandisseparatedfromthemainlandbytheBroadwaterwhichishometoawiderangeofplantcommunities．LocatedontheoffshoreislandtheResortisonlyaccessiblebymeansofwatertransportation．Itprovideshourlyferryservicefromtheharbouronthemainlandtoandfromtheisland．WithintheResorttransportmodesincludewalkingtrailsbicycletracksandthebeachtrain．Thereceptionareaisthecounteroftheshopwhichhasnotchangedin8yearsatleast．Theaccommodationisanoctagonal八角形的building．Thesearelargeroomsthatarecleanbuttheequipmentisoldandinsomecasesjustworking．Theceilingfanonlyworksathighspeedforexample．Bedsarehardbutclean．Thereisatelevisionaradioanoldairconditionerandasmallfridgeineachroom． Asanecotourism﹣basedresortmostoftheplanninganddevelopmentoftheattractionhasbeenconcentratedontheneedtoco﹣existwiththenaturalenvironmentofSouthStradbrokeIslandtoachievesustainabledevelopment． WaterandEnergyManagement Thereisgroundwateratthecentreoftheislandwhichhasamaximumheightof3metresabovesealevel．Thewatersupplyisrechargedbyrainfallandiscommonlyknownasanfreshwateraquifer含水层．CouranCoveIslandResortobtainsitswatersupplybytappingintothisaquiferandcollectingitthroughapipe．Inordertonarrowthewaterusesalllaundryactivitiesarecarriedoutonthemainland．TheResortusesLPGpowerstationratherthanafueloilstationforitsenergysupplysupplemented补充bywindpowerwhichhasreducedgreenhouseemissionsby70%．Hotwaterintheeco﹣cabinsandforsomeoftheResort'svehiclesissolar﹣powered．Waterefficientfittingsarealsoinstalledinshowersandtoilets．VisitorswhostayattheResortareencouragedtomonitortheirwaterandenergyusagebyanin﹣housetelevisionsystemandarerewardedwithprizessuchasafreereturntriptotheResortaccordinglyiftheirusagelevelislow． Evaluation InthreeyearsofoperationCouranCoveIslandResorthaswon23internationalandnationalawards．Ithaseffectivelyimplementedcontemporaryenvironmentalmanagementpractices．HowevertheResort‟sgrowthwilleventuallybelimitedbyitscarryingcapacityandquantitycontrolshouldbeincorporatedinthemanagementstrategyoftheResort． 1InordertoachievesustainabledevelopmenttheResort． A．cancelsthetransportationservice B．researchesintoplantcommunities C．provideshighqualityaccommodation D．operatesinharmonywithitsnaturalsurroundings 2WhatisappliedforheatingwateronCouranCoveIslandResort A．TheLPGpower． B．Thepetropower． C．Thesolarpower． D．Thewindpower． 3AccordingtothestudyinthefuturewhatshouldtheResortfocuson A．Increasingthesupplyoffreshwater． B．Meetingtheneedofinternationalguests． C．Improvingthetourismentertainmentprojects． D．LimitingthenumberofthegueststotheResort． 4FromthepassagewecanknowthatCouranCoveIslandResort． A．suffershugelossinnaturalresources B．achievessuccessineco﹣resortmanagement C．setsagoodexampleforprofit﹣makingbusiness D．raisesstandardsinguest﹣monitoringmanagement
Howtohelpawheelchairuserintoachair Ifyou'relookingaftersomeonewhousesawheelchairknowingthecorrectwaytoassisthiminDtoandoutofhischaircanbequiteimportant．1Soit'snecessarytounderstandhowtolendahandsafelybeforeyouattempttodoso． 1．Preparethechair． It'scrucialtoensurethatthechairisreadyforthepersontositinbeforeyoubegintomovehim．Nevertrytoadjustthechairwhenyou'realreadybearingaperson'sweight．Insteadensurethatthechairisintherightpositionbeforeyoustart．2 2．Liftsafely． Beforeyoucanhelpawheelchairuserintoachairyouneedtobeawareofseveralfactorsaswellasthecorrectwaytoliftthechairuser．Makesureyouknowhowheavyyourfriendorfamilymemberisandthatyou'restrongenoughtolifthimtositsafelyinthechair．3Yourclothingandfootwearisalsoimportant．Ensurethereisnothingyou'rewearingthatcouldcatchandthatyourshoesallowcompletestability． 3．4 Loweryourfriendorfamilymemberintothewheelchairslowlyandsteadilymakingsuretheyarefullyseatedinthechair．Iftheyareabletostandandlowerthemselvesintothechairstandbehinditandholdontothehandlestomakesureitdoesn'tmove．5Beforemovingthewheelchairaskthemtoplacetheirhandsintheirlapormoreimportantlyawayfromthewheelssothattheycanfeelcomfortable． Aboveallcheckthatthepersonyouareassistingiscalmandrelaxedandhappytoreceivehelp． A．Makethemcomfortable． B．Rememberloleavethewheelchairbehind． C．Youshouldheinanareawithnoobstaclesintheway． D．Makesureyoucanhaveafreetalkwiththewheelchairuser． E．Notknowingtherighttechniquescanresultininjurytothewheelchairuser． F．Oncetheyareseatedswingthefootrestsbackintoplacemindingtheirlegs． G．Mostimportantlymakesurethewheelchairbrakesareonandthatthechairistotallystable．
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Playtimeisinshortsupplyforyoungchildrenthesedaysandthelifelongconsequencesfordevelopingchildrencanbemoreseriousthanmanypeoplerealize． AnarticleinthemostrecentissueoftheAmericanJournalofPlaydetailsnotonlyhowmuchchildren'splaytimehasdeclinedbuthowthislackofplayaffectsemotionaldevelopmentleadingtotheriseofanxietydepressionandproblemsofattentionandselfcontrol．Sinceabout1955children'sfreeplayhasbeencontinuallydecliningatleastpartlybecauseadultshaveappliedever﹣increasingcontroloverchildren'sactivities．saystheauthorPeterGrayPh．DProfessorofPsychologyatBostonCollege． Wecandescribetheunstructuredfreely﹣chosenplayasatestinggroundforlife．Itprovidescriticallifeexperienceswithoutwhichyoungchildrencannotdevelopintoconfidentandcompetentadults．Sokidsneedmoreofitnotless．Becauseplayishowyoungchildrenlearnimportantsocialandemotionalskillssuchassharingcooperatingcommunicatingandempathizing．Ithelpsthemdevelopfitbodiesstrongmindsandbraveheartssotheycantakeonnewchallengesandriskysituations． Gray'sarticleismeanttoserveasawake﹣upcallregardingtheeffectsoflostplay．Wemustknowthatlackofchildhoodfreeplaytimeisahugelossthatmustbepaidattentiontoforthesakeofourchildrenandsociety．Butparentswhokeepalookoutoveranddisturbtheirchildren'splayareabigpartoftheproblem．Itishardtofindgroupsofchildrenoutdoorsatallandifyoudofindthemtheyarelikelytobewearingschooluniformsandfollowingthedirectionsofcoacheswhiletheirparentsdutifullywatchandcheer． Actuallywhenchildrenareinchargeoftheirownplayitprovidesafoundationfortheirfuturementalhealthasolderchildrenandadults．Playgiveschildrenachancetofindanddevelopaconnectiontotheirownself﹣identifiedandself﹣guidedinterest．Itisthroughplaythatchildrenfirstlearntomakedecisionssolveproblemsimproveself﹣controlandfollowrules．Playhelpschildrenmakefriendsandlearntogetalongwitheachotherasequals．Mostimportantlyplayisasourceofhappiness． Whenparentsrealizethemajorrolethatfreeplaycantakeinthedevelopmentofemotionallyhealthychildrenandadultstheymaywishtoreassesstheprioritiesrulingtheirchildren'slives．Theneedsforchildcareacademicandathleticsuccessandchildren'ssafetyisimportant．Butperhapsparentscanbegintoidentifysmallchanges﹣﹣suchasopeningsintheschedulebackingofffromquitesomanysupervised有监督的activitiesandpossiblyslightlylesskeepingwatchontheplaygroundthatwouldstarttheslowreturningtothedirectionoffreeimaginative﹣directedplay． 1Whatdoweknowfromthefirsttwoparagraphs A．Theriseofchildren'sanxietyismoreseriousthanpeoplerealize． B．Lackofplaytimeleadstokids'unhealthyemotionaldevelopment． C．Moreyoungchildrenaresufferingfromdepressionduetofreeplay． D．Playingtoomuchleadstoproblemsofkids'attentionandselfcontrol． 2AccordingtoPeterGrayunstructuredfreely﹣chosenplay． A．isfullofchallengesandriskysituations B．shouldbebalancedwithadult﹣directedactivities C．doesharmtochildren'sconfidenceandcompetence D．hasgoodeffectonchildren'ssocialandemotionalskills 3Thearticleisintendedfor． A．parents B．teachers C．coaches D．children 4Whichofthefollowingwouldbethebesttitleforthetext A．DoChildrenNeedMoreSelf﹣guidedPlay B．AreChildrenInterestedinGuidedPlay C．CanChildrenGuideThemselves D．AreChildren'sProblemsSerious
PublicSpeaking Publicspeakingcanbedefinedastheactofmakingaspeechinfrontofagroupoflisteners． Thetypesofpublicspeakingaredeliberatelystructuredwiththreegeneralpurposestoinformtopersuadeandtoentertain．Aninformativespeechhasapurposetoinformorgiveknowledgetoitsaudience．1Forpersuasivespeechthespeakerwouldtrytochangethemindsetperceptionorbehavioroftheaudiencefortheirowngood．Thusthespeakerneedstolookforcommongroundwiththeaudienceandtrytorelatetowhattheymightagreeon．Thelasttypeisaceremonialspeech．Ittendstobelessformalandmorepersonalthantheothertypesofspeeches．Nomatterhowwellyouknowthepersonyouaregivingspeechabouttrynottosaybadthingsaboutthemevenifitismeanttobeajoke． 2Sparingsometimetopracticewillhelpbuildconfidenceandhelpdeterminehowlongthepresentationwilllast．Asidefromitknowingwhotheaudiencewillbeisquitenecessary．Trytogetasmuchinformationaspossibleregardingthisparticulararearelatedtotheaudience．Knowingthebattlefieldinadvancewillgivethespeakersahugeadvantage． Languageisthemainaspectaspeakerneedstopayattentiontowhilegivingaspeech．3Aspeakerneedstochoosetheirwordscarefullyandmakeitcleartotheaudiencewhattheymean．Oftenwhengivenaspeechtheaudiencelookuptothespeakertogivethemsomethingnewanduseful．4Languageanddeliveryalonewillnotbesufficientifthespeakerdoesnothavethebodylanguage．Themovementandgestureofaspeakeralsoaffecttheaudience．Whileclosingthespeechorpresentationspeakerscanrestatetheirmainpointsjusttoremindtheaudienceoftheimportantthingsthathavebeensaid．5 A．Itneedstobeusedclearly． B．Thesespeechesmarkspecialoccasions． C．Theimportantthingtowatchaboutisnottoputintoomuchinformation． D．Thekeyofperfectinganythingisthroughpracticeincludingpublicspeaking． E．Theycanalsoenditwithaspecialmessageandencouragetheaudiencetoaskquestions． F．Knowinghowpublicspeakingisdoneisakeypartinunderstandingtheimportanceofit． G．Thusthespeakerneedstoknowhowtodelivertheirspeechtofulfilltheaudience‟sexpectation．
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文．文中共有10处语言错误每句中最多有两处．错误涉及一个单词的增加删除或修改．增加在缺词处加一个漏字符号∧并在其下面写出该加的词．删除把多余的词用斜线\划掉．修改在错的词下划一横线并在该词下面写出修改后的词．注意1．每处错误及其修改均仅限一词2．只允许修改10处多者从第11处起不计分．ItwasattheGreenStorethatIfindabrokenrockingchairandputitinbackofmytruck．Theseatwassplitintotwofromfronttoback．Otherthanthatitwasinexcellentlycondition．IthoughtIshouldrepairitsothatbythefollowingdayitwouldbesogoodasanewone．BySundayafternoonthegluehadsetandaftertwocoatofbrightwhitepaintthechairwasofperfect．IwasexcitingbecauseIwasgoingtosurprisemywife．Wewerenewparenttoabeautifulbabyboy．Ournewbabylovedtoberockedbutwedidn5thaveaproperrockingchair．Thischairwasbeautifulandhiswifewasveryhappywithit．
假段定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文．文中共有10处语言错误每句中最多有两处．错误仅涉及一个单词的增加删除或修改． 增加在缺词处加一个漏字符号^并在其下面写出该加的词． 删除把多余的词用\划掉． 修改在错的词下画一横线并在该词下面写出修改后的词． 注意1．每处错误及其修改均仅限一词 2．只允许修改10处多者从第11处起不计分． Squaredancinghasbeenmoreandmorepopularwiththeelderlyastheirlivingconditionsimprove．Mostpeoplethoughtitcanhelppeopletakeregularlyexerciseandstrengthentheirfitness．Besidesitprovidespeoplemorechancestotakeactivityoutdoors．Howeversomepeoplearguethatthemusicisverynoisythatdisturbsthesurroundingcitizens'normallife．Alsobeexposedtosuchloudnoisemaydoaharmtotheirhealthinthelongrun． Inmyopinionsquaredancingisagoodformofexercisesodancersshouldtakeourneighbors'needsintoconsideration．Iftheychoosearighttimeandturndownthemusicitwillcausefewertroubleforothers．
OilPaintingWorkshop Jan．72019 ForAges15andUp BeginnersWelcome!ExperienceNotRequired! Registration登记Deadline﹣﹣Dec．312018 ClassSchedule 930﹣1000amWelcomeandRegistration 1000﹣1200amPaintingSession 1200am﹣100pmLunch 100﹣300pmPaintingSession 300pmEvaluationandDeparture ˜Instructor JudyMooreGistAlexanderCertifiedInstructorandRossCertifiedInstructorismakinggreateffortstogivepeopleofallagestheopportunitytoexperienceAlexander'sTheMagicofOilPaintingandBobRoss'sTheJoyofPainting．BothWilliamAlexanderandBobRossPBSTVhostshaveinspiredthousandsoffirst﹣timepainters．Thewet﹣on﹣wettechniquehaveencouragedpeopleofallagestopickupabrushandputtheirdreamsoncanvas油画布．Judywilldothesameandyouarewelcometotakeaclassandseeforyourself．Attheendofjustonesessionyouwillbeamazedatthebeautifulpaintingthatyoucreateinjustafewhours．Youwillbecomemoreawareofbeautifulcloudshapesandcoloursyouignoredbefore．Thereisnothingmoreinspiringthanseeingthebeautifulscenerythatyoupaintandotherswilltreasureforever． FormoreinformationaboutJudyMooreGistclickhere． ˜Cost ﹩75.00/aperson．Pricesincludeallinstructorfeesmaterialsandlunch． IfyouwishtopaybycheckpleaseprinttheOilPaintJan．pdfprintableregistrationformandmailitinwithpaymenttoHolidayLake4HEducationalCenter12674﹣HCampRoadAppomattoxVA24522． ˜Refund退款Policy FullRefundDec．312018 NonrefundableafterDec．312018 FormoreinformationcontactHeathernBenninghoveat232﹣268﹣6777orheathern@vt．edu． 1Toattendtheclasspeopleshould． A．provideapieceofpainting B．payforitbeforeJan．72019 C．learnsomethingabouttheinstructor D．registerforitnolaterthanDec．312018 2TheMagicofOilPaintingandTheJoyofPaintingaremostprobably． A．artworks B．TVartprograms C．paintingexhibitions D．face﹣to﹣facepaintingcourses 3Thetextmostprobablyappears． A．ontheInternet B．inanewspaper C．onanoticeboard D．inacompanybrochure
1Suzanwantstobeanactressshecanchoose． A．CourseA B．CourseB C．CourseD D．CourseE 2CourseCisfitforthestudentswhomight． A．dealwiththenumbers B．workwiththedisabled C．runabusinessorganization D．designandconstructbuildings 3IfDavidchoosesCourseFhemightbeastudentwiththecareerinterestin． A．advertising B．politics C．nursing D．management 4Wherecanweprobablyfindthepassage A．Inacityguidebook． B．Inasciencejournal． C．Onaschoolwebsite． D．Fromanewsreport．
Accordingtolegendayoungmanwhilewanderingthedesertcameacrossaspringofdeliciouscrystal﹣clearwater．The1wassosweethefilledhisleathercontainersohecouldbringsomebacktoatribalelderwhohadbeenhis2． Afterafour﹣dayjourneyhe3thewatertotheoldmanwhotookadeepdrinksmiledwarmlyand4hisstudentlavishly浪费地forthesweetwater．Theyoungmanreturnedtohiswitha5heart． Latertheteacherletanotherstudent6thewater．Hespatitoutsayingitwas7．Itapparentlyhadbecomestale不新鲜的becauseoftheold8container．Thestudent9histeacherMasterthewaterwas10．Whydidyou11tolikeitTheteacherrepliedYouonlytastedthewaterItastedthe12．Thewaterwassimplythecontainerforangetofloving﹣kindnessand13couldbesweeter．Ithinkweunderstandthislessonbestwhenwereceive14giftsoflovefromyoungchildren．Whetherit'sanuglyplateorabraceletthenaturalandproper15isappreciationandexpressed16becausewelovetheideawithinthegift． Gratitudedoesn'talwayscome17．Unfortunatelymostchildrenandmanyadults18onlythethinggivenratherthanthefeelingembodied被体现init．Weshouldremindourselvesand19ourchildrenaboutthebeautyandpurityoffeelingsandexpressionsofgratitude．20giftsfromtheheartarereallygiftsoftheheart． 1A．desert B．voice C．spring D．water 2A．master B．teacher C．relative D．friend 3A．took B．presented C．show D．delivered 4A．thanked B．nodded C．laughed D．joked 5A．light B．heavy C．happy D．broken 6A．throw B．pour C．taste D．bring 7A．tasty B．bitter C．hot D．awful 8A．leather B．rubber C．metal D．firm 9A．asked B．added C．challenged D．doubted 10A．fragrant B．delicious C．smelly D．bitter 11A．have B．pretend C．happen D．intend 12A．gift B．meaning C．feeling D．drink 13A．none B．everything C．seldom D．nothing 14A．innocent B．precious C．guilty D．priceless 15A．demand B．response C．comment D．problem 16A．thankfulness B．smile C．laughter D．praise 17A．firstly B．friendly C．immediately D．naturally 18A．ignore B．value C．stress D．forget 19A．tell B．bring C．teach D．send 20A．Asaresult B．Inaword C．Afterall D．Inthemeantime
PizzaisaprettycommontreatbutwherediditstartHerearethreethingsyouprobablydon'tknowaboutpizza． 1Pizza'sOriginsAreHalf﹣Baked． TheNeapolitansinItalyareproudofsayingtheyinventedpizzabutit'sprobablymoreaccuratetosaytheyperfectedit．Theideaofputtingtoppingsonaflatbreadandbakingitstartedinthe6thcenturyB．C．ButthepeopleofNapleswerethefirsttoputthetomatoonaflatbreadinthe16thcentury．Fromitsstartpizzawasthefoodforthepoorasitwascheapfillingandeasytoeatontherun．InItalianthewordpizzareferstoanythingthatismadeandthenpressedflat． 2PizzaMargheritaIsNotExactlyaSymbolofItaly． Itissaidthatonedayin1889alocalbakernamedRaffaeleEspositocreatedthreepizzasforQueenMargheritawhenshewasonatourofItaly．ThequeenlovedtheversionthathadthetomatobasilandmozzarellacheeseanditjusthappenedtomatchthecolorsoftheItalianflag．SoEspositonamedthepizzaafterher． ButScottWienerpointsoutthatItalywasunifiedinnameonlyin1889soitwasunlikelyanyNeapolitanbakerwouldwanttocelebratetheNorthernconquerorFurthertheletterofgratitudeforthepizzafromtheroyalhouseholdthatPizzeriaBrandidisplaysappearstobeafakeandmayjusthavebeenamarketingstrategy． 3HawaiianPizzaInventedbyaCanadian． SamPanopoulosfromGreeceoriginallymovedtoCanadaattheageof20．In1962hedecidedtoputsomehamandpineappleonapizzaatoneofhisrestaurantsinOntario． WejustdiditforfuntoseehowitwasgoingtotastehetoldtheBBCin2017．PanopoulosnamedittheHawaiianpizzaafterthebrandofthecannedpineappleheused．Themixtureofsweetandsavorytoppingsbecamepopularwithacertainpartofthepizza﹣lovingpublic．Theinventordiedin2017． 1Whowaspizzafirstmadefor A．Peoplewhowereverybusy． B．Peoplewhowererunningaway． C．Thepoorpeoplewhocouldaffordit． D．Soldiers． 2WhatisPizzeriaBrandi'spurposeofdisplayingtheletter A．ToshowhonorforQueenMargherita． B．Tohatchamarketingplot． C．Toprovethepizza'srelationwiththeroyalfamily． D．TotelltheworldPizzaMargheritaisexactlyasymbolofItaly． 3ThenameoftheHawaiianpizzacamefrom． A．anotherbrandoffood B．aCanadianrestaurant C．thefounder'sowninterest D．itsuniqueHawaiianflavor
RunningforaDream IwillneverforgetthatNovemberday．Itwashotterthannormal．Thiswasthe1myfatherandIhadwaitedsolongforbecausewehadbeenworkingtowardsthisraceforthreeyears．Dozensoffamiliarfacesfromchurchandschoolflashedacrossmyview．Theyhadcome2me．Isawworryand3onmyfather'sface．Thentheracebegan! ForthefirsttwoandahalfmilesIfelt4．Ihadneverbeforebeensoreadyforsomething．Theweeksleadinguptotheracewerefilledwithcontrolled5andastrictdiet．Myfriendshadn'tseenmeinweeksbuttheyunderstoodthe6requiredtomakemydreamareality．AsinallofmyracesIdidn't7outinthefrontIlovedthepleasureofpassingpeopleasmystrengthovertooktheirprematurespeed． Thenwithoutwarningmystrengthbegantodecrease．NeckandneckwithoneofmygreatestcompetitorsI8seethefinishline．Ihadbegunthefinaldashinto9whenmykneesbecameweakandmylegsgaveway．NothingIcoulddowouldmakethem10weight． Iwatchedasrunnersrushedbyme．11IknewmydreamsofvictoryweredestroyedIhadtofinishtherace．Howevermylegshurtbadly．Withallofthe12leftinmeIgotonmyhandsandkneesandcrawled爬inchbyinchacrossthefinishline．Voicesboth13andfamiliarcheeredmeon．Theygavemethecouragetokeep14untiltheveryend． Thedoctorswerethereinsecondsbutmyeyessearchedthecrowdforhim．TherewasonlyonepersonIwantedto15to．IwhisperedI'msosorryDadI'msosorryI16you．HelookedatmesayingYoucouldneverdisappointme．Sometimesthesethingsjust17．Allthatmattersisthatyoudidyourbest． Butweworkedso18．WhataboutourdreamHereachedoverformyhandandsaidDon'tyouknowthatyouaremydreamandithascometrue Itwasn'tlongbeforemyrunningshoeswerebackonmarkinga19pathformyjourneyIlearnedthatallofthemilesthetearsthesweatandthepainmydadandIexperiencedtogetherwerenotfora20．WhatIrealizedthoughwasthattohimIwasthegreatestprizehehadeverwon． 1A．dream B．weather C．result D．day 2A．for B．to C．across D．over 3A．coldness B．astonishment C．excitement D．amusement 4A．proud B．great C．nervous D．afraid 5A．programs B．studies C．instructions D．practices 6A．understood B．blamed C．criticized D．concerned 7A．look B．move C．start D．come 8A．should B．could C．must D．need 9A．relief B．spirit C．pleasure D．glory 10A．give B．feel C．hold D．add 11A．Where B．Because C．If D．Although 12A．trust B．emotion C．strength D．confidence 13A．loud B．foreign C．rough D．firm 14A．going B．running C．fighting D．training 15A．refer B．talk C．listen D．agree 16A．frightened B．disturbed C．disappointed D．bored 17A．develop B．change C．follow D．happen 18A．late B．hard C．closely D．quickly 19A．new B．near C．rough D．narrow 20A．wish B．duty C．rank D．race
采用H2或CO催化还原NO以达到消除污染的目的在氮氧化物尾气处理领域有着广泛应用．回答下列问题 1用CO处理NO时产生两种无毒无害的气体该反应的氧化产物为． 2已知氢气的燃烧热为285.8kJ/mol 2NOg＝N2g+O2g△H＝﹣180.5kJ/mol H2Og＝H2O1△H＝﹣44kJ/mol 写出用H2处理NO生成水蒸气和1molN2的热化学方程式． 3针对上述H2处理NO生成水蒸气和1molN2的反应回答下列问题 ①研究表明上述反应中正反应速率为v正＝k正c2NOc2H2其中k正为速率常数此处只与温度有关．当t＝t1时v正＝v1若此刻保持温度不变将cNO增大到原来的2倍cH2减少为原来的v正＝v2．则有v1v2填“＞”“＜”或“＝” ②在温度T下容积固定的密闭容器中充入3molNO和2molH2发生上述反应起始压强为p0一段时间后反应达到平衡此时压强p＝0.9p0则NO的平衡转化率aNO＝结果保留三位有效数字该反应的平衡常数Kp＝用含p的代数式表示Kp为以分压表示的平衡常数且某气体的分压＝总压×该气体的物质的量分数 4实验室常用NaOH溶液吸收法处理NOx反应方程式如下已知NO不能与NaOH溶液反应． NO+NO2+2NaOH＝2NaNO2+H2O 2NO2+2NaOH＝NaNO2+NaNO3+H2O ①若NOx此处为NO和NO2的混合气体能被NaOH溶液完全吸收则x的取值范围为． ②1molNO2和溶质物质的量为1mol的NaOH溶液恰好完全反应后溶液中各离子浓度由大到小的顺序为． 5一氧化氮﹣空气质子交换膜燃料电池将化学能转化为电能的同时实现了制硝酸发电环保三位一体的结合其工作原理如果所示写出放电过程中负极的电极反应式若过程中产生2molHNO3则消耗标准状况下O2的体积为L．
假定你是李华近期你市的人民剧院将上演著名京剧霸王别姬FarewellMyConcubine你恰好有两张票．请给在你市学习汉语的美国好友Jeremy写封邮件邀他一同前往观看． 内容包括1．演出时间地点 2．演出内容 注意1．词数100左右 2．可以适当增加细节以使行文连贯．
A OnceIwasplayinginthewoodswhentheskystartedtoturndarkandthewindstartedtoblow．Isawabigblackcloud1movetowardsme．SuddenlyIfelttherainhittingmyface!Actuallyitwaspouring!ThenIsawlightninginthesky．AndlaterBOOM!!!Aloudclapofthunder!ThenIsawalittleoldhutandraninside．Itsmelledawfulandthewallswereshakingbutitwas2goodthannothing!Outsidethewindwashowlingandthingswereflyingaround．Ijuststoodinthecornercoldandscared．3luckymydadcameandfoundme．Iwassafe! B LiBaiwasaChinesepoetpraisedfromhisowndaytothepresentasaromanticfigure4tooktraditionalpoeticformstonewheights．Thirty﹣fourofhispoemsareincludedinThreeHundredTangPoems．5heearlypoetrytookplaceinthegoldenageofTangdynasty．ThisallchangedsuddenlywhenallofnorthernChina6destroybywar．Fortunatelymanyofhispoems7surviveeversinceenjoyinglastingpopularityinChinaandelsewhere． C TheChineseLunar月球ExplorationProgramisdesignedtobeconductedinthreestagesThefirstissimplyreachinglunarorbit轨道atask8completebyChang'e1in2007andChang'e2in2010．Thesecondis9landontheMoonasChang'e3didin2013andChang'e4in2019．ThethirdoneiscollectinglunarsamplesandsendingthemtoEarthataskforthefutureChang'e5andChang'e6missions．It10beChina'sfirstsamplereturnmissioninDecember2019．
FreeEntrytoPalaceofVersailles﹣Save﹩18! ThePalaceofVersaillesisoneofthelargestandmostsplendidcastlesintheworld．Havingaround2143windows1252fireplacesand67staircasesthecastleisoneofthemostvisitedattractionsinFrance． Asafineexampleof18th﹣eenturyFrenchartthishistoricbuilding‘hasbeenonUNESCO'sWorldHeritage遗产Listfor30years． AtfirstitjustuhuntinghousebuiltbyLouisVIII．ButLouisXIVchosethesitetobuildthepalaceweknowtodaythesymbolofroyalabsolutism专权专治andclassicalseatofpowerin1789butgotroleinthe19thcenturyastheMuseumoftheHistoryofFrancewhichwasfoundedwhenLouisPhilippebecamethekingin1830． Thishistoriccastlewithitsbeautifularchitectureandgardensandlonghistoryisa．must﹣visitsightonasightseeingtriptoParis． ◆OpeningTimes HighseasonIApril～31OctobereverydayexceptMondays900～1830．Lastadmission1800． LowseasonNovember～31MarcheverydayexceptMondays900～1730．Lastadmission1700． ◆EntrytothePalace TogettothePalaceofVersaillesbyRERCrailline大区快铁C线makesuretobuyaParis﹣VersaillesRiverGaucheticketzones1～4． WithaParispassyoucanvisitthepalacefreeofcharge﹣that'sasavingofEuros．PleasenotethatVersaillesisoutsidezone3butsingleRERtraintickettoVersaillescostyouonly﹩3.25． WithaParispassyoudon'tneedtoqueueupbutcanuseprivilegedPassholderentryagreatbenefitifyouarevisitingduringthebusyspringorsummerseasons． ◆NoteYourentrydoesnotincludethemusicalfountainshows．Whenthewatershowsaretakingplaceyouwillbeunabletovisitthegardensunlessyoupurchaseaseparateticket． 1WhatcanwelearnaboutthePalaceofVersailles A．Itwasusedasamuseumatfirst． B．ItwasbuiltinmemoryofLouisXIV． C．Itwastheofficialseatofpowerin1830． D．ItisnotsobusyinNovemberasinOctober． 2IfavisitorwantstoenjoythePalaceofVersailleshewill． A．reachzone3ontime B．beallowedtovisititonMondays C．spendsomemoneytakingtheRERtrain D．alsowaitinthequeuelikeothertravelers 3Inordertowatchthewatershowsyouhavetobuy A．aParisPass B．aticketspeciallyforit C．asingleRERtrainticket D．aParisVersaillesRiverGaucheticket
已知乙醇乙醛的沸点分别为78℃20.8℃．某同学试图利用下列实验装置来完成“乙醛的制备收集和检验”一系列实验其中设计不合理的是
Dujiangyanistheoldestman﹣madewatersystemintheworldand1wonderinthedevelopmentofChinesescience．Builtover2200yearsagoin2isnowSichuanProvinceinSouthwestChinathis3amazewatersystemisstilluesedtoday． InancienttimestheregioninwhichDujiangyannowstands4sufferfromregularfloodscausedbytheoverflowforthewaterfromtheMinjiangRiver．5helpthevictimsofthefloodingLiBingtheregiongovernortogetherwithhissondecidedtofinda6solve．LidesignedaseriesofchannelsbuiltatdifferentlevelsalongMountYuleithatwouldtakeawaythefloodwaterwhileleavingtheriverflowingnaturally．7goodstilltheextrawatercouldbedirectedtothedryChengduPlainmakingitsuitableforfarming． Oncethesystemwasfinishednomorefloodsoccurredandthepeoplewereabletolivepeacefully．TodayDujiangyanisadmiredbyscientistsfromaroundtheworldbecauseofonefeature．Unlikemoderndams8thewaterisblockedbyahugewallDujiangyanstillletswaterflowthroughtheMinjiangRivernaturally9enabletheecosystemsandfishpopulationstoexist10harmony．
假设你是红星中学高三学生李华你的英国朋友Jim在邮件中表示下周将到北京参加一个主题为游学在北京的文化体验活动向你咨询有关景点的信息．请给他回邮件内容包括 1．推荐一个特色景点 2．说明理由 3．温馨提示． 注意1．词数不少于50 2．开头和结尾已给出不计入总词数． DearJim Yours LiHua
假设你是红星中学高三学生李华．请根据以下四幅图的先后顺序写一篇英文周记记述你们上周邀请京剧名家来你校参与京剧进校园主题活动的全过程． 注意词数不少于60． 提示词京剧Beijingopera脸谱facialmakeup
假设你是红星中学高三1班学生李华．请根据以下四幅图的先后顺序写一篇英文周记记录你参加学校丝绸之路知识竞赛的全过程． 注意词数不少于60．
WhenIwasfiveyearsoldmymothersufferedfromdepression﹣andotherhealthissuesleavingmetocareforher．This1reversedourrolesaschildandcaretaker． WhileIknewmymotherwassickI2thateverythingwouldbeokay．3in1997everythingwenthorribly4andmylifechangedforever． Adoptionisan5wordtoafive﹣year﹣oldbutwhenI6thatmymotherhadsignedmeovertostrangersIfeltitwastheultimatebetrayal．Isufferedfromshock7andconfusionasIattemptedto8mynewfamily．IdidlearntolovemynewparentsthoughIcouldn'tforgivemymotherfor9me．Hearingpeopletellmethatshediditinmybestinterest﹣thatsheactually10me﹣mademebitter．Iinsistedthat11shehadtrullylovedmsshewouldhavemadeitworkforourlittlefamily． HowevertheolderIgotthemoreIbegantounderstandhow12oursituationhadbeen．Wehadbeen13boxesofnoodlesandweevenlivedinourcar．Ihavestartedtounderstandthe14sheputmeupforadoptionandthatshereallydidsaveme． OnlyrecentlyhaveIbegunto15howamothercouldgiveherchildtostrangersandIrealizenowwhatasacrificeitmusthavebeenforhertoletmego．Shewas16buteveninherstatesheunderstoodthatshewaspullingmedownwithher．Shelovedme17anythingsoshewantedmetohaveachanceinlifeonesherealisedshecouldnolonger18me．WhenIlookbacknowIam19toher．EventhoughIresented怨恨herforalongtimeInowknowmylifehasbeenaspecilagiftonlybecauseshewas20enoughtogivemeup． 1A．trend B．direction C．situation D．operation 2Arecognized B．believed Cadmitted D．explained 3A．However B．Therefore C．Otherwise D．Besides 4A．well B．wrong C．mad D．common 5A．exact B．right C．warm D．foreign 6A．regretted B．wondered C．realized D．expected 7A．cold B．hunger C．tiredness D．anger 8A．giveup B．worryabout C．adjustto D．searchfor 9A．rejecting B．raising C．criticizing D．accompanying 10A．blamed B．loved Cfeared D．forgot 11A．although B．if C．since D．unless 12A．familiar B．simple C．desperate D．stable 13A．throwingaway B．chargingfor C．dreamingof D．survivingon 14A．reasons B．risks C．rules D．results 15A．remember B．understand C．ignore D．describe 16A．upset B．sick C．polite D．calm 17A．otherthan B．ratherthan C．morethan D．lessthan 18A．lend B．control C．teach D．offer 19A．grateful B．similar C．equal D．rude 20A．curious B．patient C．selfless D．careful
已知函数fx＝|x﹣3|． 1若ft+f2t＜9求t的取值范围 2若存在x∈[24]使得f2x+|x+a|≤3成立求a的取值范围．
ThereisarestaurantinmyMainetownthathasdonelittletoupdateitselfoverthepast80years．Thisispartofitscharmasisthewoodenphonebooththatsitsneglectedintheageofthecellphone．Ahthephonebooth．Weneeditnowmorethanever． Formeitsymbolizesthatphonecallswereonceprivateaffairseveniftheinformationbeingsharedwasnotsensitiveinanyway．Itwassimplyassumedthataphonecenversationwasmeantfortwopeopleandtwopeopleonly． Growingupinthe1960swehadonlyphoneinthehouse．AsakidIdidn'tgetormakemanycallsbecauseallmyfriendsfivewithinearshotandIcouldjustyelloutthewindowifIwantedtheirattention．IdohoweverrememberansweringthephoneaskingfortheidentityofthecallerandthenhandingthephonetomymomShe'dtakeitsayHelloMrs…onemomentpleaseandthenassheplacedherhandoverthereceiversheturnedtomeanddirectedThisisforme．Whydon'tyougooutsideandplay Flashforwardtowhatcellphoneshavedonetoourlife．Withinthespaceofafewyearsoverhearingprivateconversationsseemstobenormal．NotlongagoIwassittinginBoston'sSouthStationnearamanwhowasonhiscellphonewaitingformytrain． ThefollowingiswhatthemanhadtosayYesthat'sright．Theredandyellowroses．Thenhecontinuedtorecitehiscardnumberaridexpirationdate有效期．Istaredatthefellow．HeglancedatmeandaskedWhatMyresponsewasimmediateIrecitedhiscardnumberbacktohimalongwiththeexpirationdate． Thereisnolongerasenseofpersonalbordersorlimits．Thecellphonehasbecomeamegaphone扩音器andIhavebeenprivy私下知情todetailsofpeople'slivesthatIwouldrathernotknow．Maybephoneboothscouldserveascellphoneharborstoday． 1WhatfeaturedoestherestaurantinMainetownhave A．Itisverypopular B．Itisold﹣fashioned C．Itwillclosedown D．Ithasbeenneglected 2Asakidtheauthor A．hadafewfriends B．oftencalledhisfriends C．wasnotallowedtoanswerthephone D．learnedthatphoneconversationsareprivate 3Whatistheauthor'sattitudetowardscellphone A．Critical B．Tolerate C．Optimistic D．Approving 4WhatdidtheauthordoinBoston'sSouthStation A．Hetalkedtoanoldfriend． B．Heboughtsomecolorfulroses． C．Heoverheardaman'spersonalinformation． D．Hehelpedastrangerwhowasmakingacall．
SavingDuketurnedouttobeoneofthebestdecisionsJennahadevermade．Littledidthisfamilyknowtheywereabouttobeextremely1foradoptingDuke．Sixyearslateritbecameapparentjusthow2Dukeistothefamily．This3camewhenJennagavebirthtotheirsecondchildabeautifullittlegirlcalledHarper． InearlyOctober2012Harperwasonlynineweeksoldwhensomethingunusualoccurred．Duke4MomandDadinthemiddleofthenightwiththemostabnormalbehavior．DukejumpeduponJennaandEric'sbedandbeganshakingfromheadtotoe．Itwassuch5behaviortoseefromsuchatypicallywell﹣behaveddog．AtfirstJennaandErictriedto6thedogbutthentheythoughtthedogmightbe7thiswayforanotherreason．SureenoughEricquicklyraninto8onHarperandwasshockedbywhathesaw． Harperlookedjustlikeadoll．Shewent9hereyesglassyandherfigureunmoving．Theirnewbabywasn'tbreathingandtheparentsneededto10quickly．FortunatelyJenna11Harperhardonthebackandthebabybeganbreathingagain．Theparentswereimmediatelyfloodedwith12butitdidn'ttakelongforthatrelieftoturntogratitudetoDuke．ItappearedHarper's13hadbeencausedbyacidreflux胃酸倒流．Consequentlysheendedup14ontheup﹣swallow．15Duketheparentswouldhavesleptrightthroughit． 16thecaseofDukereceivedwidepublicity．Werescuedhimandhe17usbyrescuingourdaughterduringanemergencyJennatearfullytoldcameras18therescuehappened．Dukewithnodoubtisaherotous． Indeedheroesare19fromlove．Themoreyoulovethemthemoretheyloveyou．Sosaveadogandgiveita20tosaveyoutoo． 1A．regretful B．grateful C．delighted D．worried 2A．generous B．sensitive C．mean D．vital 3A．realization B．admiration C．news D．relationship 4A．annoyed B．interested C．attacked D．surprised 5A．brave B．rude C．strange D．normal 6A．calmdown B．pickup C．playwith D．believein 7A．barking B．jumping C．reacting D．rushing 8A．check B．wait C．spy D．focus 9A．mad B．hungry C．red D．pale 10A．recover B．act C．call D．run 11A．laid B．threw C．hit D．took 12A．disappointment B．relief C．anxiety D．satisfaction 13A．mistake B．puzzle C．disability D．problem 14A．choking B．breathing C．pausing D．flowing 15A．Thanksto B．Butfor C．Inspiteof D．Regardlessof 16A．Hopefully B．Naturally C．Honestly D．Sadly 17A．repaid B．betrayed C．treated D．supported 18A．before B．when C．since D．after 19A．protected B．respected C．spread D．made 20A．life B．home C．chance D．hand
Theaye﹣ayeinthesamefamilyaspeoplemonkeysandapesisabout40cmlongwithabushytaleaboutthesamelengthasthebody．Thedarkbrownfurislongandwoollygivingtheanimalarathershaggy蓬松的appearance．TheyarefoundonlyonMadagascaranislandoffthecoastofAfrica．ItlivesinthetropicalforestsintheeastandnorthofMadagascar． Theaye﹣ayeismostlyarboreal栖息在树上的butissometimesseenwalkingontheground．It'sactiveduringthenightlookingaroundinthetreesforfood．Theaye﹣ayeisactuallythelargestprimate灵长类动物activeduringthenight．Largeeyeshelptheaye﹣ayefinditswayaboutatnight．Duringthedaytheaye﹣ayesleepsinanestinatree．Aye﹣ayesspendalmostthewholenighttravellingaboutandfeeding． Aye﹣ayeslivealone．Sometimespairsareseenbutbasicallylittleisknownabouttheirlives．Theydon'tleapandclingtotreeslikeotherprimates．Theymoveaboutonallfourlegs．Theyoccasionallymakebriefcriesbutareusuallysilent．Wormsinsidedeadwoodformthelargestpartoftheaye﹣ayediet．Theaye﹣ayealsofeedsonfruiteggsandbambooshoots． Thefrontfeetoftheaye﹣ayeareunique．Allthetoesarelongandthinbutthethirdisexceptionallylong．Theaye﹣ayetapsonthetreetrunkandlistensformovementasitsearchesforplaceswherewormsmightbelocated．Itbitesatthetreetomakehomesthenitusesitslongthirdfingertoreachinsideandhookoutworms．Thefrontteethoftheaye﹣ayegrowcontinuouslyandareworndownbyitseatingatbarkinitssearchforworms． Aye﹣ayesareclosetobegoneortotallygone．Becauseofdeforestation伐木orforestdestructiontheanimalshavethereforebeenforcedtoeatvillagers'cropsandmanyaye﹣ayeshavebeenkilledwhiledoingso．InadditionsomepeopleonMadagascarwillbelievethatseeinganaye﹣ayeisasignthatsomeoneclosetothemwilldiesotheykilltheanimalsonsight． 1Accordingtothefirstparagraphtheaye﹣aye． A．lookscolorful． B．hasahairlesstail． C．likesthehotplaces． D．soundslikemonkeys． 2Theaye﹣aye'sthirdfingerismainlyto． A．makeholesbigenough B．reachintotheholeforfood C．helpwalkfastontheground D．gettheanimalstofixonthetree 3Whatarereducingthenumberofaye﹣ayes A．People'sactivities． B．Environmentchanges． C．Globalwarming． D．Environmentalprotection． 4Whatisthepurposeofthepassage A．Toprotecttheaye﹣ayes． B．Tostopforestsbeingdestroyed． C．Tomaketheaye﹣ayeslivebetter． D．Tointroducetheaye﹣ayes．
钛Ti被誉为第三金属广泛应用于航空航天等领域．四氯化钛TiCl4是生产金属钛的重要原料某小组设计实验制备四氯化钛并验证其产物CO装置如下 已知部分信息如下 ①制TiCl4的反应原理为TiO2S+2Cs+2Cl2gTiCl4g+2COg②四氯化钛的熔沸点分别为﹣24℃136℃易挥发在水或淛湿空气中都极易水解加热时能被O2氧化 回答下列问题 1气流由左至右装置的正确连接顺序为AHE填字母． 2A中盛装盐酸的仪器名称是G装置的作用是． 3写出A中发生反应的化学方程式实验室欲制备6720mLCl2标准状态则理论上应转移mol电子． 4能证明上述反应有CO生成的实验现象是． 5利用如图所示装置测定产品纯度取wgTiCl4产品进行实验向安全漏斗中加入适量蒸馏水待四氯化钛充分反应后将烧瓶和漏斗中的液体一并转入锥形瓶中滴加几滴0.1mol•L﹣1的K2CrO4溶液作指示剂注明Ag2CrO4呈砖红色用cmol•L﹣1AgNO3溶液滴定至终点消耗滴定液VmL．【已知常温下KspAgCl＝1.8×10﹣10KspAg2CrO4＝1.1×10﹣12．TiCl4+2+nH2O＝TiO2•nH2O↓+4HCl】 ①安全漏斗在本实验中的作用除加水外还有． ②根据上述数据计算该产品的纯度为用含wc和V的代数式表示．
Indonesiaishometofouroftheworld'sworstpollutedriversandrankssecondwhenitcomestoplasticwaste．Sincesingle﹣usepackagingisalargecontributortotheproblemEvowareanIndonesian﹣basedcompanydecidedtohandlethatissuefirst．Andnowakindofedible可食用的packetshasbeeninvented． Afterinvestigatingvariousmaterialoptionsthecompanysettledonseaweed．Unlikecomcommonlyusedforcontainersseaweeddoesnotrequireresourceslikewaterorlargeamountsofspace．AccordingtoEvowareasmuchas40tonsofseaweedcanbegrowninanareathesizeofabaseballfield．Italsohelpsabsorbharmfulgreenhousegaseslikecarbondioxide．SinceIndonesianfarmersalreadyharvestmoreseaweedthantheycansellitiseasyforthecompanytofindthematerial． ThoughtheywillnotmakepublictheirproductionprocessEvowareannouncestheseaweedpackagingcontainsnochemicalsandissafetoconsume．Inadditiontowrappingfastfooditemsitcanalsobeusedtohousethingslikeinstantnoodleseasoning调味品andinstantcoffee． Thoughtheediblewrappersmaynothaveanytastethesamecannotbesaidaboutthesingle﹣usecupsthatthecompanyhasalsoinvented．Thesingle﹣usecupsthatcanbeusedtoservecolddrinksareavailablewiththetasteoforangeandgreentea． Whilereplacingplasticwiththeseaweedproductsmayseemlikeano﹣brainertomostofusitisahard﹣sellinIndonesia．AccordingtoChristianTheawarenessunderstandingandsenseofurgencytominimizetheuseofsingle﹣useplasticarestillverylow．Alsoafactoristhecostwhichishigherthanusingplastic． HopefullyEvowarewillsucceedinconvincingIndonesiansandpeopleworldwidethatswitchingtotheirproductswillgoalongwayinprotectingourbeautifulplanet． 1WhatisEvoware'spurposeofinventingeatablepackages A．Tomakefulluseofseaweed． B．Tomakegenerousprofits． C．Toattractmorecustomers． D．Toreduceplasticpollution． 2Whatcanwelearnaboutseaweedfromparagraph2 A．Itiseasytoget． B．Itbreaksdowneasily． C．Itishardtoharvest． D．Itcangrowinabaseballfield． 3Howaresingle﹣usecupsdifferentfromseaweedpackaging A．Theyarebeautiful． B．Theyhavedifferenttastes． C．Theyareinvariousshapes． D．Theyareenvironmentallyfriendly． 4Whatstopstheseaweedproductsbeingwidelyused A．Thehighcost． B．Theterribletaste． C．Thelackofseaweed． D．Thecomplexproductionprocess．
TheearthhaschangedoverandoveragainthroughoutthecourseofitshistoryInordertosurviveinchangingenvironmentsspeciesmustoftengothroughaprocessofadaptation．Adaptationreferstogeneticchangethatenablesanorganism生物体suchasananimalorplanttosurviveinitsenvironment．Iftheorganismsofaspeciescannotchangealongwiththeareainwhichtheylivetheyriskdyingout．Recenthistoryhasgivenusanimportantexampleofhoworganismsareabletosurviveoncetheirenvironmentschange． Lightgraypepperedmoths胡椒蛾anddark﹣coloredpepperedmothslivedinthecountrysidebetweenthecitiesofManchesterandLondoninEnglandManyyearsbeforethe19thcenturymoreofthelightgraypepperedmothshadbeenabletosurviveintheirenvironmentmostlybecauseoftheircolor．Birdscouldn'tseethelight﹣coloredmothsonthetreesbecausethecolorofthemothswassimilartothecolorofthetrees． Intheearly19thcenturythoughEnglandbeganthefirstyearsofitsIndustrialRevolution．Manyareasbecameoccupiedbyagrowingnumberoffactories．Manyofthesefactoriesneededcoaltoprovideenergyfortheirmachines．Whencoalbumsitgivesoffalotofdark﹣coloredsmokes．Thetreesbegantoblackenbecauseofallthesmokeintheairfromthefactories．Thismadethelightgraypepperedmothsmuchmorevulnerable．Birdscouldseethemonthetreesmoredearlyandeasilyhuntthemdown． SometimeinthenexthundredyearsscientistsbegantonoticeahugechangeinthemothpopulationlivinginandbetweenthecitiesofManchesterandLondon．Mostofthepepperedmothswereofthedark﹣coloredkind!Whatcausedthischangewasthefactthatbirdshadeatenalotofthelightgraypepperedmothsbecausethemothscouldbeseenclearlyonthedarkenedtrees．Thedark﹣coloredpepperedmothsintheareasurvivedmuchmoreeasilyandmatedwithotherdark﹣coloredpepperedmothsuntilmostofthepopulationofpepperedmothsbecamedark﹣colored． 32．Ifaspeciescan'tadapttothechangingenvironmenttheyarelikelyto． A．bedrivenoutoftheirhabitat． B．becomeextinct C．movetoanotherenvironment D．gothroughgeneticchanges 33．Whatconclusioncanbedrawnfromthechangeintwokindsofmoths A．Therewerepreviouslynodark﹣coloredpepperedmoths． B．Thelight﹣coloredpepperedmothsmovedtoanewenvironment． C．Thecolorchangehadnothingtodowiththechangeintheirenvironment． D．Darkcoloringwasbetterforthepepperedmothssurvivalinthe19thcentury． 34．Whatdoestheunderlinedwordvulnerableprobablymean A．Quicktochange B．Opentoattack C．Easilydefended D．Inastrongposition 35．Whatdoestheauthormainlydescribeinthepassage A．HowtheIndustrialRevolutionimprovedthelivesofworkers． B．Howtheearthchangedthroughoutthecourseofitshistory． C．Howhumaninfluenceorganismsthroughartificialselection． D．Hownaturalselectionchangedthepopulationofpepperedmoths．
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