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已知（x-3）2+|y-4|=0，则的平方根是（ ）A． B．± C． D．±
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下面是某校关于中学生双休日活动现状的一份调查结果.请在借助资料以HaveFunonWeekends!为题给EnglishonCampus写一篇稿件.就中学生应如何过双休日发表你的看法. 注意:1.词数100左右2.无需使用全部资料3.适当拓展以使内容连贯.
Itwasverydifficultforhimtotakeastandthemajority. A.for B.in C.against D.to
HigherEducationINTHEUnitedStates HighereducationintheUnitedStatesincludesanyprogramofstudyattwo﹣year﹣collegesfour﹣yearcollegesandgraduateschools.Therearemorethan4100communitycommunitycollegescollegesanduniversitiesintheUnitedStates.Four﹣yearcollegesgrantundergraduatebachelor'sdegreesB.A.orB.S..Two﹣yearcollegesoftencalledcommunitycollegesoffertheAssociateofArtsortheAssociateofSciencedegreesA.A.orA.S.Thewordscollegeanduniversityareoftenthesamebutitisgenerallyunderstoodthatauniversitycanoffergraduatedegreesaswell.ThesedegreescanbequitespecializedsuchasaMasterofArtsinaparticularsubjectorevendoctoratedegrees. Americancollegesanduniversitiesmaybepublicprivateorreligiouszōng jiāo 的.Publicuniversitiesareownedbythestates.Studentspaytuition学费atpublicuniversitiesbutthosewhohavelivedinthestateforacertainperiodoftimedonotpayasmuchasstudentsfromoutsidethestate.Theannualaveragecostoftuitionfeesandroomandboardatuniversitieswas$36564in2014.Thesecostshoweverdependonthesizelocationreputation声誉etc.oftheuniversity. Privateandreligiousinstitutionscanbeveryexpensivebecausetheydonotreceivethesametypeoffundingthatpublicschoolsdoalthoughtheymaygetsomemoneyfromthestateforcertainprograms.SomeAmericanprivateuniversitiesareconsideredthebestinthenationifnotintheworldbutthecostsoftheseschoolsareveryhigh.Itisusuallynotnecessarytobeamemberofaparticularregiontoattendthereligiousschool. Lasttherearealsosometechnicalinstitutionsthatareprivatelyownedlikebusiness.Thesetechnicalinstitutesoffertwo﹣yearprogramsinsuchfieldsasautomotiveengineeringbusinessandelectronics.Thetrainingisveryspecializedandthegoalsofthestudentsarespecificallyrelatedtoaparticularoccupation. 1.Whatdegreesdothecommunitycollegesoffer? A.Bachelor'sdegrees B.Master'sdegrees. C.A.A.orA.S. D.Doctoratedegrees. 2.What'sthedistinctivefeatureofpublicuniversities? A.Roomandboardarefree. B.Theyaresupportedbythestates. C.Theaveragecostisover﹩36564peryear. D.Studentsfromdifferentstatespaythesametuition. 3.Whydosomepeoplechoosetoattendprivateuniversities? A.Theyreceivefundingfromthegovernment. B.Theyarelocatednearwherestudentslive. C.Theyareexcellentineducation. D.Theyprovidesomefinancialhelp. 4.Wherecanwepossiblyfindthetext? A.Afashionmagazine B.Astorybook C.Atravelguide D.Agovernmentwebsite
下列与“方向”有关的叙述错误的是
关于下列生物实验的说法正确的是
Mostdogownersareconvincedthattheirfour﹣leggedfriendsknowexactlywhattheymeanwhentheyusecertainwordslikesitstayortreat.Howeverresearchershavealwayswonderedwhetherdogsreallyunderstandhumanspeechoriftheyrelyonotherinformationtogetthemeaning.Forexampledoesthewordfetchformapictureofastickorballinthedog'smindordoesthedogbringbacktheobjectbasedontheowner'svoiceorgesture?AnewstudybyscientistsatAtlanta'sEmoryUniversityseemstoindicatethatman'sbestfrienddoesindeedknowwhattheownerissaying. Theresearchersbeganbyaskingtheownersoftwelvedogsofvariouskindstotraintheirpetstoidentifytwotoysofdifferentmaterialssuchasatoyanimalandaball.Oncethedogshadmasteredthetasktheytookturnsinsideaspecialscanner.Theownersthentestedtheirdog'slanguageskillbyfirstcallingoutthenamesofthetoystheyhadbeentrainedtorecognizeandthensayingmeaninglesswordssuchasbobbuandbodmickwhileholdinguprandomobjectsthedogshadn'tseenbefore. Thescanssuggestedthatthepartsofthedogs'brainsresponsibleforprocessingofsoundsshoweddifferentbrainpatternswhentheyheardwordstheywerefamiliarwithcomparedwiththeonestheyhadneverheardbefore.Whilethatwasnotenoughtoprovethatthedogswerepicturingtheirtoyswhentheyheardtheworditdidindicatesomesortofrecognition.Theresearchersbelievethisisanimportantstepforwardinunderstandinghowdogsprocesslanguage. Evenmoreinterestingwasthatthedog'sbrainsshowedahigherlevelofneural神经activityatthesoundofunknownwords.Thisistheexactoppositeofwhathappensinhumanbrainswhichgetmoreactiveatthesoundoffamiliarwords.Theresearcherssaythedogsmaybecomecheerfulatthesoundofnewwordstotrytounderstandtheminthehopeofdelightingtheirmasters.DogswanttopleasetheirownersandperhapsalsoreceivepraiseorfoodsaysEmptyneuroscientistGregoryBurnsseniorauthorofthestudy. Howeverthoughyourpetmayunderstandhumanspeechthescientistsrecommendusingvisualsignalsandsmellfortraining.Whenpeoplewanttoteachtheirdogatricktheyoftenusespokencommandbecausethat'swhathumanspreferPrichardsays.Fromthedog'sviewhoweveravisualcommandmightbemoreeffectivehelpingthedoglearnthetrickfaster. 1.What'sthepurposeofthenewstudy? A.Toconvincedogownerstounderstandtheirdogs. B.Toadvisedogownerstotreattheirdogskindly. C.Toprovedogsfollowowners'orderbylistening. D.Totestouthowdogsgetinformationfromowners. 2.Whatdoestheauthorintendtodoinparagraph2? A.Informtheresultoftheresearch. B.Statetheprocessoftheresearch. C.Stresstheimportanceoftheresearch. D.Introducethesubjectsoftheresearch. 3.Howdohumanbrainsanddogbrainsreacttowords? A.Humanbrainsbecomeactiveatunfamiliarwords. B.Dogbrainsbecomedelightedatunfamiliarwords. C.Humanbrainsarenotsensitivetofamiliarwords. D.Dogbrainsshownoresponsetofamiliarwords. 4.Whatdoscientistsadvisetheownerstodoindogtraining? A.Givedogsoralcommand. B.Teachdognewtricks. C.Involvesightandsmell. D.Encouragefasterlearning.
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. Ioftengotoaweekendschool.Sodidmanyofmyclassmates.Thisseemspopularamongstudents.Goodweekendschoolshaveexcellentteacherswhichhelpusimproveourstudies. Besidesthiswegettoknowstudentsfromanotherschoolsandlearnabouttheircampusoflife. Soeverycoinhastwosides.Ourschoolworkisalreadyaheavyburden.Extralessonoftentakeuptoomuchofourtime.Inadditionpaylotsofattentiontotheextralessonswillaffecttheirschoolsubjects.WemayalsofindourselvesverytiredonMondaystoconcentrateonthelessonsinourschool.Weshouldthinkseriouslyaboutthisissueandmakebestuseofourtime.
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WelcometoAffairedeCoeur Youronlineconnectionformeetinggreetingandreadingaboutyourfavoriteauthorsandtheirlatestbooks.AffairedeCoeurabookreviewmagazinebringsyouthemostrecentarticlesandreviewsavailableontheweb.Onourpagesyouwillfindhonestbookreviewsfromallgenres类型fictionandnon﹣fiction. AdC'Sblogsandarticles: LifeisaRollerCoasterRidebyNatashaMoore ThesongmaysayLifeisaHighwaybutI'vefoundmylifehashadsomanyupsanddownsthatitoftenfeelsmorelikearollercoaster.AsIwritethisIjustworkedmylastdayatthedayjobIheldforthirty﹣sevenyears. DesertSurvivalbyKatMartin AsawriterIamalwayslookingfornewideas.ButIoftenfindthatmypastexperiencescanbeanimportantpartofthestory.Haveyoueverspenttimeinthedesert?CommentandyoucouldwinasignedcopyofKat'slatestreleaseAgainsttheOdds. TheInspirationsofOldHomesbyBethTrissel Passionforthepastandresearchintothosewho'vegonebeforemeistheunderlyinginspirationforallmyworkasisthebeautifulShenandoahValleywhereIlive.MyScots﹣Irishancestors祖先wereamongtheearliestsettlershere.DidyouknowVirginiahasmoreghoststoriesthananyotherstate? EmbracingHappilyEverAfterFairytaleStyleByHopeTarr IthinkIwasprobablyborntobearomancewriter.AsfarbackasIcanrememberI'vebeeninlovewithloveandthenotionofsoulmates﹣﹣﹣thatthere'saperfectpartneraOneTrueLoveforeachofussomeonewhowillviewusthroughlove'srose﹣coloredlenses镜片. 1.WhatcanyounormallyfindfromAffairedeCoeurmagazine? A.Bookreviews B.Placestotravel C.Ancientarticles D.Ticketinformation 2.Whichbookshouldyoucommentonifyouwanttheauthor'ssignature? A.DesertSurvival B.LifeisaRollerCoasterRI C.TheInspirationsofOldHomes D.AgainsttheOdds 3.WhichbookmentionsthatVirginiahasgotthemostghoststories? A.DesertSurvival B.LifeisaRollerCoasterRide C.TheInspirationsofOldHomes D.EmbracingHappilyEverAfterFairytaleStyle 4.Whichauthorregardshimself/herselfaromancewriter? A.KatMartin B.NatashaMoore C.BethTrissel D.HopeTarr
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请回答下列相关问题 1在提取胡萝ト素的实验中需要浓缩编浓缩的原理是． 2在涂布平板时滴加到培养基表面的菌液量不宜过多的原因是纯化之后的菌株需要用选填“液体”或“固体”培养基进行大量繁殖． 3某小组采用稀释涂布平板法检测水样中细菌含量．在涂布接种前随机取若干灭菌后的空白平板先行培养了一段时间这样做的目的是． 4在凝胶色谱法制作过程中装填凝胶柱时不得有气泡存在原因是． 5发酵过程中应定期测定亚硝酸盐的含量原因是．
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AttheageofsevenwhilehisfriendswerespendingtheirallowancesonthingslikecandyandtoysJoseAdolfoQuisocolawasbusysavingmoneyforbasicpurchases.Totrytogethispeers同龄人todothesametheboyfromPerucameupwiththeideaofaneco﹣banktheBartselanaStudentBankwhichallowskidsofallagestobecomefinanciallyindependentwhilealsohelpingtheenvironment. Setupin2012thebankistheworld'sfirstbankforkids.Tobecomeamemberakidhastobringinatleast5kilogramsofsolidwasteandsetasavingsgoal.Onceacceptedallbankpartnersarerequiredtodepositatleastoneadditionalkilogramofrecyclablesonamonthlybasisandobserveotherrequirementssuchasattendingfinancialeducationandenvironmentalmanagementworkshops. ThewasteaccumulatedissoldtolocalrecyclingcompanieswhothankstoJose'seffortspayahigher﹣than﹣marketrateforeverythingbroughtinbythebankmembers.Themoneyreceivedisplacedinthepersonalaccountwheretheycollectuntilthesavingsgoalisreached.Theaccountholdercanthenwithdrawthemoneyorchoosetoleaveitandcontinuetogrowforabiggertarget.AtthebeginningmyteachersthoughtIwascrazyorthatachildcouldnotundertakethistypeofprojectJoserecalls.Theydidnotunderstandthatwearenotthefutureofthecountrybutitspresent.LuckilyIhadthesupportoftheschoolheadmasterandanassistantinmyclass. Theboy'seffortspaidoffandby2013thebankhadover200memberswhobroughtinonetonofrecyclablewaste.Todaytheeco﹣bankwhichnowhasthesupportofseverallocalinstitutionsboaststeneducationalcenters.Theyaredesignedtoteachtheover3000studentsaged10to18tobecomefinanciallyindependentusetheirmoneywiselyandhelptheenvironment. NotsurprisinglyJose'seffortshaveearnedhimseveralnationalandinternationalawards.OnNovember202018JosewonChildren'sClimatePrizewhichcomeswithamedaland＄5500inprizemoneyandisgiventoachildoryouthwhohasaccomplishedanextraordinaryachievementfortheclimateorenvironment. 1.WhydidJosesetupthebank? A.Toraisemoneyandsetuparecyclingcompany. B.Tobuynecessitiesanddonatethemtoneedykids. C.Tosavemuchmoneyandprotecttheenvironment. D.Toeducatethestudentsandhelpthemwinprizes. 2.Howcanakidbeadmittedtotheeco﹣bank? A.Bydonatingtotheeco﹣bank. B.Byturninginonekilogramofwasteinamonth. C.Bysendinginanapplication. D.Bypresentingagoalandacertainamountofwaste. 3.HowdidtheteachersfeelaboutJose'sprogram? A.Doubtful. B.Excited. C.Moved. D.Worried. 4.Whatisparagraph4mainlyabout? A.Howtheenvironmentisimproved. B.Whattheprojecthasachieved. C.Howtonsofwastehasbeenrecycled. D.Whatsupportthelocalinstitutionsget.
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.每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:把多余的词用斜线\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. LasttermIhostedanexchangestudentcallingJacobfromtheGreatBritaintoourschoo1.HereallycaresforChineseculture.Jacobaskedmetoshowhimselfaroundthecityonweekends.ItookhimtomanylocalplaceofinterestandwealsogotothetheatertowatchashowofPekingOpera.Hewassoattractedbytheperformanceashedecidedtolearnit.MyfatherhappenedtoknowamasterofPekingOperaandintroducedJacobtohim.Jacobwasgreathonoredtobeoneofhisstudents.PuthisheartintoitJacobmadearapidprogress.WhenhereturnedEnglandhegaveaperformanceforwhathewonmuchadmirationfromhisclassmates.
下列有关生理活动的叙述正确的是
研究者为了研究外加葡萄糖对小球藻光合色素含量及细胞生长的响分别在甲组暗条件加足量葡萄糖乙组光照条件加足量葡萄糖和内组光照条件不加葡萄糖三种条件下培养小球藻结果如图1图2所示．1请写出直接影响小球藻光合作用光反应阶段的三种大量元素．除CHO元素外2分析图1可知添加葡萄糖对小球藻细胞的含量有显著影响．3图2结果表明光照条件加足量補萄糖培养条件下小球藻生长最快主要原因是．4缺少钾盐植物光合产物的合成与运输受阻光合速率下降说明无机盐的作用是．5瓜农为提高产量常给西瓜苗施油菜籽饼牛粪等农家肥其优点除了提高土壤温度利于无机盐的吸收还有等优点．
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Thecostofthewholetripshouldbe500dollarsinfigures. A.close B.round C.even D.natural
Rememberbacktowhenyouwereayoungchild.Canyourecallwhoyourheroeswere?Weretheypeopleinyourfamily?WeretheyfrombooksorTVormovies? Duringtheirteenyearsyoungpeoplesearchfortwotypesofheroes.Thefirsttypeofherotheylookforissomeonetheycanadmire.Toooftenhowevertheyconfusesuperstarswithheroes.MostTVormoviesuperstarsaren'treallyheroes﹣﹣﹣they'recelebrities名流productsofthemedia.Thedangercomeswhenyoungpeopleconfusetheheroicwiththefamous.Infactbecausetheydon'thaverealheroespeopleofallagesturntofantasy想象中的heroes.AndthemediainturnfillthisneedwithIndianaJonesSupermanConantheBarbarianJamesBondLukeSkywalkerandotherfantasyfigures. Thesecondtypeofheroyoungpeoplesometimeschoosestandsfordisobedience叛逆towardparentsandrules.AnexampleisBlutoBluntarskyinthemovieAnimalHouse.Blutoisaterribletroublemaker.OfcoursesometeenagersmayactuallyadmireBluto'spersonalqualities. Aretheserealheroes?Notreallybecausewhotheyareandwhattheydoarepurelyadream.Realheroesareonesyouloveandwanttokeepasheroesforever.Celebritiesareeasycomeeasygo. Butdon'tcountrealheroesoutyet.Eveninanagewhenpeoplesaytherearenoheroes﹣﹣﹣onlycelebrities﹣﹣﹣therearecountlessheroes.Therearemanyheroeswhoarenotsowellknown.Theyhaveriskedlifeoranythingvaluableonamatterofprinciple. Everyoneneedsheroestoadmire.Whetherthey'removiestarsrelativesnextdoorneighborsorstrangerswe'vereadaboutweneedthem.Bywhattheydoheroesshowusthatwetoocandosomethingoutstandingevenifweareonlyordinarypeople. 1.Whatproblemdoyoungpeopleoftenhaveaboutheroes? A.Theysearchforheroesintheirdreams. B.Theyneverlearnfromheroes C.Theyareuncertainaboutwhotoadmire D.Theyoftenlovetroublemakers 2.Whatistheauthor'sopinionaboutthetopic? A.Thereareveryfewrealheroes. B.Heroescanbefamouspeople C.Principlescauseheroes'death D.Allpeoplecandosomeheroicdeeds. 3.Youngpeopleneedheroesmainlybecausetheywantto. A.haverolemodels B.becomesuperstars C.admirecelebrities D.lovefantasyfigures 4.Whichofthefollowingcanbethebesttitleforthetext? A.BecomingHeroes B.EverybodyNeedsHeroes C.CelebritiesorHeroes? D.WhyHeroes?
AbeautifulSeptembereveningmy11﹣year﹣oldgrandsonJoshandhisteamwerewarmingupfortheirfirstfootballgameoftheseason. Atsixthe1calledthecaptainsforwardsaidsomethingand2hiswhistle.Thetwoteams3separately.Iwas4.Theotherteamwas5teninchestallerthanourplayers.Itdidn'ttakelongfortheir6advantagetoshow.Theytooka7﹣0leadvery7.Atthehalfthescorestoodat34to6.Josh8minimalplaytime.InthesecondhalftheyusedJoshmoreoften.Thescoreclimbedto40to6. Onceagaintheotherteambegantheir9downthefield.Theirquarterbackthrewtheball.Thereceivercaughtitand10thegoal.Therewasonlyonemaninhis11﹣Josh.Joshdoveand12thatboy'slegswithallhisstrength.ThereceiverdraggedJoshacoupleofyardsand13felldown. OnthenextplaytheirquarterbackshotthroughanopeningandrushedtothegoalbuttherewasJoshagain.Joshtookhimoffhisfeetand14anothergoal.Theyscoredonthelastplay.butitwasn'tJosh's15.Thegameendedwithascoreof48to6. Onthewayhome.Iwantedto16Joshbutheturnedtomewitha17smile.Grandpathatwasa18game. Butyoulost48to6! IknowbutIdidgood. Theboyunderstoodthe19betterthanIdid.Theydidn'twinbuthedidhisbest.Iwasproudofhim.More20hewasproudofhimself. 1.A.player B.referee C.coach D.receiver 2.A.waved B.raised C.threw D.blew 3.A.gathered B.practiced C.celebrated D.wandered 4.A.inspired B.embarrassed C.shocked D.delighted 5.A.intotal B.onaverage C.atlength D.forexample 6.A.speed B.strength C.age D.size 7.A.often B.soon C.regularly D.rarely 8.A.saw B.lost C.expected D.wasted 9.A.break B.search C.charge D.debate 10.A.1etin B.foughtfor C.wentin D.headedfor 11.A.way B.position C.sight D.mind 12.A.maderoomfor B.1ookedupat C.tookholdof D.keptawayfrom 13.A.accidentally B.finally C.deliberately D.gradually 14.A.saved B.gained C.tried D.kicked 15.A.turn B.honor C.fault D.option 16.A.trick B.scold C.praise D.comfort 17.A.sad B.wide C.bitter D.polite 18.A.great B.close C.silly D.vital 19.A.team B.play C.game D.field 20.A.seriously B.fortunately C.specifically D.importantly
下列表述正确的是
Imaginebeingbornwithoutarms.Noarmstohugsomeoneandnohandsto1touch.Orwhataboutbeingbornwithoutlegs?Havingno2todancewalkrunorevenstandontwofeet.Nowputbothofthosescenestogether:noarmsandnolegs.Howwouldthat3one'severydaylife? WithoutanymedicalexplanationNickVujiciccameintotheworldwithneitherarmsnorlegs.Imaginethe4hisparentsfeltwhentheysawtheirbabybeingwhattheworldwouldconsiderimperfectand5.Littledidtheyknowthatthisbeautifullimblessbabywouldonedaybesomeonewhowould6andmotivatepeoplefromallwalksoflife. ThroughouthischildhoodNickdealtwiththe7ofself﹣respectandstruggledwithdepressionand8.AsNickgrewuphelearnedtodealwithhis9andstartedtobeabletodomoreandmorethingsonhisown.He10tohissituationandfoundwaysto11tasksthatmostpeoplecouldonlydobyusingtheirlimbssuchascleaningteeth12hairtypingonacomputeretc.Astime13Nickbegantoeagerlyaccepthis14andachievegreaterthings. Nickgotadoublebachelor'sdegree15inaccountingandfinancialplanning.Bytheageof19Nickhadstartedto16hisdreamofencouragingothersbysharinghisstorythrough17speaking.Hefoundthepurposeofhis18.Nowat27yearsoldhehasaccomplishedmorethanmostpeople.Hehastravelledaround19hisstorywithmillionsofpeople.Heisatrueinspirationalandmotivational20. 1.A.understand B.experience C.know D.prevent 2.A.ability B.interest C.reason D.chance 3.A.affect B.limit C.improve D.design 4.A.calmness B.excitement C.shock D.eagerness 5.A.unique B.abnormal C.extraordinary D.unqualified 6.A.teach B.organize C.inspire D.comfort 7.A.challenge B.management C.question D.load 8.A.tiredness B.disappointment C.loneliness D.relief 9.A.fault B.disability C.shortage D.willpower 10.A.devoted B.attended C.adapted D.stuck 11.A.accomplish B.attain C.find D.reduce 12.A.wearing B.brushing C.cutting D.losing 13.A.wentup B.wentahead C.wentaway D.wentby 14.A.situation B.position C.state D.emergency 15.A.researching B.majoring C.aiming D.choosing 16.A.cometrue B.undertake C.realize D.support 17.A.meaningful B.motivational C.significant D.strong 18.A.action B.behavior C.existence D.communication 19.A.telling B.recalling C.sharing D.writing 20.A.doctor B.speaker C.writer D.driver
Lostwalletswhichcontainapictureofababyaremorelikelytobereturnedtotheirownersscientistshavediscovered. Researchersleft240walletsonthestreetsofEdinburghlastyeartoseehowmanywerereturnedtotheirowners.Someofthewalletscontainedoneoffourphotographs﹣ababyacutelittledogafamilyandaportraitofanelderlycouple.Otherwalletscontainedacardsuggestingtheownerhadrecentlymadeacharitydonationwhileacontrolsample对照组containednothingatall. ProfessorRichardWisemanapsychologistwhowasinchargeoftheexperimentsaid42percentofthewalletswerepostedbackintotal.Thosecontainingthepictureoftheinfantorthebabyweremostlikelytobringaboutanhonestreactionfromthefinderwith88percentbeingreturnedfollowedbythosecontainingpicturesofthelittledogat53percent.Ofthosefeaturingthefamilysnapshot48percentweresenttothereturnaddressandonly28percentofthosewiththepictureoftheelderlycouple.Walletscontainingthecharitycardsandthecontrolsamplewereleastlikelytobereturnedwithratesof20and15percent. ProfWisemanoftheUniversityofHertfordshiresaidThebabykickedoffacaringfeelinginpeoplewhichisnotsurprisingfromanevolutionaryperspective角度.Wewereamazedbythehighpercentageofwalletsthatcameback. Thewalletswereplantedatrandomaboutaquarterofamileapart.Snapshotswereinsertedintoaclearplasticwindowinsidethewalletsnoneofwhichcontainedmoney. 1.What'sthemainideaofthepassage? A.Researchersleft240walletsonthestreetsofEdinburghlastyear. B.ProfessorRichardWisemancarriedoutanexperimentwith240wallets. C.Lostwalletscontainingapictureofababyaremorelikelytobereturned. D.Walletswithcontainnothingaremostlyreturnedtotheirowners. 2.Thepassageismadebelievableby. A.tellingstories B.usingfigures C.askingquestions D.givingexamples 3.TheunderlinedphrasekickedoffinParagraph4mostprobablymeans. A.caused B.showed C.avoided D.accepted 4.Itcanbeinferredthat. A.peoplewhoreturnedthewalletsareinterestedinpsychology B.dogsaremorerespectedinwesterncountriesthantheelderly C.ProfessorWisemanhadexpectedtheresultbeforetheexperiment D.theresultoftheexperimentcanbedifferentifwalletscontainmoney
Therearevariousaspectsthatgointomakingasuccessfulschoolandsuccesscanbemeasuredinvariousways.Oftentheteachersarepraisedforaschool'ssuccessandblamedforitsfailure.Yetinorderforaschooltobeeffectiveitmustbeaplacewhereteachingandlearningcaneasilytakeplaceandthatrequiresthehardworkofmorethanjusteducators.Studentsmusttakelearningintotheirownhandsandfeelasifwhattheyaredoingisasimportantasitactuallyis.Thiscanonlybedonewiththecooperationofeveryadultthatisinvolvedinthestudents'life.Someoftheseindividualsoftengounnoticedyettheroletheyplayinthestudents'livesisimmeasurable. Intheschooladministrativeassistantsgreetstudentsatthestartofthedayandansweralargequantityofquestions.Whenanassistantremembersastudent'snameorevensomethingspecialaboutthatstudentitcommunicatestohimthatheiscaredfor.Theassistantcanalsogivethatextraencouragementforastudenttomakebetterchoicesespeciallywhentheyarevisitingtheprincipal'soffice. Meanwhilethoughcafeteriaworkershaveashortspaceoftimetointeractwithstudentstheycanmakeabigdifferenceaswell.Beyondmeetingnutritionalneedscafeteriaworkersmayalsoonoccasionmeettheemotionalneedsofthestudentstheyserve.Studentsbenefitfrompositiveinteractionwithadultsandcafeteriaworkersmaygivethatextrabitofencouragementthatachildneeds. Custodians管理员areusuallyunderappreciatedforwhattheyoffertoschools.Theyhavetobeknowledgeableabouteverythingfromcleaningtofixingthemostintricate复杂的tools.Theygettoschoolearlyinthemorningbeforeteachersarriveandlockuplateatnightafterthelaststudenthasleftfromtheafter﹣schoolevent.Theyalsomakesureteachersareequippedwiththenecessaryitemsandpreparetheroomssothattheyarereadyforlearning.Agreatcustodianalsogivesthatkindwordorextrasmiletothatstudentwhoneedsitmost. 1.Thepurposeofthepassageisto. A.emphasizetheroleteachersplayinaschool B.highlightthecontributionsofotherstaffatschoolbesidesteachers. C.telluswhomakethegreatestcontributionstoaschool D.explainwhatcontributestothesuccessofastudent 2.Ifanassistantremembersastudent'snamethestudentwillfeelthat. A.heispaidparticularattentionto B.heisspecial C.hehasdonesomethingwrong D.hehasmadeprogressinstudy 3.WhichofthefollowingisTRUEaboutcafeteriaworkers? A.It'senoughforthemtocookforthestudents. B.It'shardforthemtointeractwiththestudents. C.Theyhavethemostinteractionwithstudentsatschool. D.Theycanalsomeettheemotionalneedsofthestudents. 4.Howdoestheauthorfeelaboutthestaffmentionedinthetext? A.Disappointed. B.Dissatisfied. C.Appreciative. D.Doubtful.
﹣﹣﹣Youwantcreamandsugarinyourcoffee? ﹣﹣﹣ A.Asyoulike B.Yesplease C.Pleasedo D.Yeswithpleasure
已知人类免疫缺陷病毒HIV流感病毒都是RNA病毒并且HIV通过T淋巴细胞表面的CD4受体识别T淋巴细胞并侵染进入细胞内．请回答下列问题1为了区别个体生活的外界环境人们把由构成的液体环境叫做内环境．调节网络是机体维持稳态的主要调节机制．2抗体在流感治愈过程中的作用是．3艾滋病患者的恶性肿瘤发病率远高于正常人这主要是由于患者免疫系统的功能严重下降．4科学家正研究将病毒引诱到导致其死亡的陷阱细胞中以防止病毒增殖．他们用CD4受体修饰过的成熟红细胞引诱HIV识别并侵染已取得阶段性成果．请简要说明其机理．
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