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如图所示，边长为1的正方形网络中粗线画出的是某几何体的三视图，则该几何体所有棱长组成的集合为（ ）
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高三下学期数学《》真题及答案
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已知函数fx＝x2﹣1ex+x． 1求fx在[﹣1]上的最小值 2gx＝fx﹣aex﹣x当gx有两个极值点x1x2x1＜x2时．总有gx2≤t2+x1+1求此时实数t的值．
10分Whenathletesatthe2020TokyoOlympicscollecttheirmedalsthey'llnotonlybewearingsomethingthatcelebratestheirsportingperformancebutsomethingthatsymbolizeslastingness.Forboththe2020OlympicsandParalympicsorganizersaimtomakeallofthegoldsilverandbronzemedalsoutofusedelectronics.Thisstrongmessageabouthowtomakeuseofe﹣wastehasgottenaofJapaninvolved. StartinginApril2017theJapaneseOlympicCommitteebegancollectingoldlaptopsdigitalcamerassmartphonesandotherabandonedelectronics.Theinitiative倡议hasachievedgreatsuccess.Alreadythequantityneededforbronzemedalshasbeenmetandthey'reinthehomestretchforsilverandgoldmedalsmeaningthecollectionprocesscanpackupattheendofMarch. Whenlookingjustatthenumberofcellphonescollectedtheamountofwasteisshocking.Inaperiodofabout18monthsalittleover5millionsmartphoneswerecollectedthankstocooperationwithNTTDOCOMO.Japan'slargestmobilephoneoperatorallowedthepublictoturninphonesattheirshopswhichcountedalotintheproject'ssuccess. Afterbeingtakenapartandsortedthesmallelectronicsunderwentasmeltingprocesstoextract提炼allthegoldsilverandbronzeelements.Thankstothisinitiativetheworldwidestrugglewith﹣wastewillhaveaglobalplatform.AccordingtoastudypublishedbytheUnitedNationsUniversity﹣44.7millionmetrictonsofe﹣wasteweremadein2016.Only20%ofthatwasactuallyrecycled.Unfortunatelythisfigureissettorisesignificantlyinthecomingyearsmovingto52.2millionmetrictonsby2021.SowhiletheTokyoOlympicsinitiativemightbejustadropinthebucketit5sagoodstartinshowingwhatthepubliccandoifthey'remademoreawareoftheissue. 1WhatcanbelearntaboutTokyoOlympicsinitiativefromthepassage? A.E﹣wasteintheworldisincreasingsignificantly. B.Ifseasytogetelementsneededfromtheusedelectronics. C.Onlyproducersofelectronicsparticipatedintheproject. D.NTTDOCOMOcontributedtothesuccessoftheproject. 2WhichcanbestreplacetheunderlinedwordhomestretchinParagraph2? A.startingperiod B.collectioneffort C.finalstage D.hardsearch 3WhatinfluencedoestheTokyoOlympicsinitiativehave? A.Itoffersaneffectivemethodtosolvetheproblemofe﹣waste. B.Itshowsthepowerofadvancedtechnologyindailylife. C.Itsavestheexpensespentinmakingallthemedals. D.Itencouragesthepublic'sinvolvementindealingwithe﹣waste. 4Whatisthewriter'sattitudetotheTokyoOlympicsinitiative? A.Positive B.Negative C.Ambiguous D.Indifferent
30分Lastweek26﹣year﹣oldZiontookaseatandputhisfoodonatableataMcDonald's.Hewasintendingto1breakfastbyhimselfwhen70﹣year﹣oldJanwhoislivingalone2Zion.Thensheaskedinaweakvoice3shecouldsharethetablewithhim.Zionsaid‘yes'4. Zionintroducedhimselfandshookthelittlelady's5hand.Theydidn'tknoweachotherandtheycouldn'tbemore6.Buttodaytheyhadamealtogetherandspentthenext45minutesenjoyingeachother's7andsharingstoriesabouttheirlives.Liketheywerefriendstheytalkedand8together.WhentheirtimetogethercametoanendZion9hertohercarandtheyexchangednumberswiththeintentionofhavinga10againsoon. Sheissucha11womanZionrecalled.Shementionedmanytimeshowweallshouldloveoneanotherandhowweshouldnot12anyonebecauseyouneverknowhowtheirdayisgoingandwhattheyhave13. Zionisgladthathis14conversationwithJancouldinspiresomanypeoplebuthesaysthatheismostlyjusthappytohaveanew15.Hesaysthatheisvery16tosetupanotherbreakfastdate.I'll17tryingsaidZion.Iknowifwehadforevershewouldhavea18formeforeveryday. Everystrangerhasthe19tofosteranewfriendship.Their20storyhasbeenpostedonsocialmediaanditmeltsourhearts.Nowtheyareinternetfamous. 1A.prepare B.order C.eat D.finish 2A.invited B.approached C.recognized D.greeted 3A.that B.when C.how D.if 4A.enthusiastically B.casually C.nervously D.anxiously 5A.delicate B.strong C.wrinkled D.skilled 6A.popular B.different C.friendly D.admirable 7A.success B.peace C.freedom D.company 8A.laughed B.played C.cheered D.teased 9A.carried B.led C.walked D.drove 10A.visit B.breakfast C.share D.call 11A.wonderful B.silent C.generous D.content 12A.ignore B.blame C.suspect D.judge 13A.dependedon B.givenup C.gonethrough D.caredabout 14A.brief B.sweet C.private D.serious 15A.friend B.start C.target D.opportunity 16A.upset B.frightened C.proud D.excited 17A.start B.keep C.advocate D.consider 18A.gift B.food C.story D.sponsor 19A.potential B.intention C.fortune D.confidence 20A.strange B.familiar C.amusing D.touching
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10分Formanyofusit'seasytotellifit'sacomputerthat'scallingyouonyourphonebecauseofitsvoice.It'salsoeasytohangup﹣it'sjustacomputerafterall.ButGoogleDuplexanartificialintelligenceAIvoiceassistanthasshownthatcomputersareabletoconductanaturalconversationwithahumanoverthephoneandcompletesimplereal﹣worldtasksreportedtechsiteWired. OnMay8duringitsannualdeveloperconferenceGoogleI/OthecompanyshowedDuplexmakingphonecallsandhavingfullconversations.Firstitcalledahairsalontomakeanappointmentbeforecallingarestauranttomakeareservation.ziliaoqun811176101 AsCNETnotednotonlyhasGooglechangedthetypicalcomputerizedvoicebutthecompanyhastakenextrastepstodisguisethesystemtosoundmorelikeahuman.Duplexcomeswithimperfections﹣ummsanduhhs﹣andusestypicalhumanphrasingsuchasOhgotcha.AsaresultthereceptionistsontheotherendofthecallhavenoideatheyareconversingbackandforthwithAIcommentedCNET. SomeseeDuplexasquiteabreakthrough﹣itwillbeabletohelphumanscutdownonboringtasks.ButfortherestitstraddlesafinelinebetweenbeingconvenientanddeceptiveasWiredwrote.Peoplehaveahardenoughtimeknowingwhethernewsisrealorfakeandnowwemaynotbeabletotrustourownears. GooglealsomentionedthatsoonDuplexwillbeabletoimitatetheowner'svoice.WhilethisisagreatstepforwardinAIitalsoraisesmanyconcerns.ForexamplestudentscoulduseDuplextocalltheirschooltopretendthey'resickbyusingtheirmother'sorfather'svoice.SincepeopleareshockedbythefactthatamachinecanimitateahumansowellGooglehaspromisedthatinthefuturethevoicewilltellthelistenerthatit'snotarealperson. 1WhatistheadvantageofGoogleDuplexoverotherAIvoiceassistants? A.Themoretypicalcomputerizedvoice. B.Themorehuman﹣likesoundofthesystem. C.Thebetteruseofhumanphrasing. D.Thebetteruseofhumanvoice. 2WhatdoestheunderlinedworddeceptiveinParagraph4mean? A.Useless. B.Boring. C.Misleading. D.Impressive. 3Whatisthebesttitleofthispassage? A.ANewWaytoPhoneOthers. B.AIDouble﹣edgedSword. C.Duplex﹣APerfectVoiceAssistant D.ABigStepforwardinAI. 4Whatistheauthor'sattitudetowardtheGoogleDuplex? A.Neutral B.Positive C.Concerned D.Doubtful
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某种植物的羽裂叶和全缘叶是一对相对性状．某同学用全缘叶植株植株甲进行了下列四个实验． ①让植株甲进行自花传粉子代出现性状分离 ②用植株甲给另一全缘叶植株授粉子代均为全缘叶 ③用植株甲给羽裂叶植株授粉子代中全缘叶与羽裂叶的比例为11 ④用植株甲给另一全缘叶植株授粉子代中全缘叶与羽裂叶的比例为31 其中能够判定植株甲为杂合子的实验是
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某种H+﹣ATPase是一种位于膜上的载体蛋白具有ATP水解酶活性能够利用水解ATP释放的能量逆浓度梯度跨膜转运H+．①将某植物气孔的保卫细胞悬浮在一定pH的溶液中假设细胞内的pH高于细胞外置于暗中一段时间后溶液的pH不变．②再将含有保卫细胞的该溶液分成两组一组照射蓝光后溶液的pH明显降低另一组先在溶液中加入H+﹣ATPase的抑制剂抑制ATP水解再用蓝光照射溶液的pH不变．根据上述实验结果下列推测不合理的是
10分Forcollegegraduatesitisofvitalimportancetowriteapplicationletterswell.1Itshouldstateclearlythejobyouwantandshouldtellwhatyouhavedone.Itshouldbesimplehumanpersonalandbriefwithoutleavingoutanynecessaryfacts. Inwritingaletterofapplicationkeepinmindthatthethingsapossibleemployerismostlikelytowanttoknowaboutareyourqualificationsyourachievementsandyouraims.2Ifthefirstfewsentencesfailtowinthereader'sattentiontherestofthelettermaynotbecontinuedatall.Trytokeyyouropeningremarkstotheneedsorinterestsoftheemployernottoyourownneedsordesires.ForexampleinsteadofbeginningwithIsawyouradvertisementintoday'snewspaperyoumightsayIhavemadeacarefulstudyofyouradvertisingduringthepastsixmonthsorIhavemadeasurveyinmyneighborhoodtofindouthowmanyhousewivesuseyourproductandwhytheylikeit. 3Beclearaboutthekindofjobforwhichyouarenowapplying.Collegegraduateslookingfortheirfirstpositionsoftenaskwhattheycanprovideinaletterandwhatifemployerswarnexperiencewhichnaturallynobeginnerhas.4 Itisimportanttowriteagoodstrongclosingforyourletter.Makeaspecificrequestforanintervieworgivethepossibleemployersomethingdefinitetodoorexpect.5Thatmakesiteasierforapossibleemployertogetintouchinyou. A.Hereareafewsuggestionsforyoutoprepareyourselfbetterforyourinterview. B.Anexcellentideaistoencloseastampedself﹣addressedenvelopewithyourletter. C.Theansweristhateverythingyouhaveeverdoneisexperience. D.Don'tbeafraidofbeinganewhand. E.Trytoavoidwritingingeneral. FThepurposeofaletterofapplicationistohelpyoutosellyourself. G.Theopeningparagraphisperhapsthemostimport.
30分Istoodonmygrandmother'sfrontporchwithmyson.Hehadabottleofbubbles.Youknowthe1it'sbasicallysoapywaterwithaplasticlooponeachend.Youdiptheloopinthebottle pullitoutandblowittomakebubbles.Mysonunderstoodtheprinciplebutwas2tryingtoblowbubbles.He3dipanddipandblowandblowbutalasnobubbles.He4methebottleandloopandaskedmeDaddycanyoumakebubbles? Ihadn'tblownbubblesinyears.Iama5byeducationfairlywell﹣trainedinsurfactant活性剂technology.Ihave6severalshampoossoIunderstandsurfacetensionandrelatedfoaming发泡沫characteristicsofsurfactants.Allthatknowledgeis7uselesswhentryingtoblowbubblesfromaloop8withsoapywater.Iwashavingno9successthanmyson.Idippedandpuffedstillnobubblesthesoapyfilmontheloopwouldjustpopwithout10anybubbles. Afterseveralfruitless111changedstrategies.12puffingontheloopofsoapywaterIgently13onit.Mysonscreamedwithdelightasabigbeautifulbubbleformedand14away.Hegrabbedtheloopdippedandblew.Nobubbles.I15tohimSonyoucan'tblowhard.Youmusteversogentlybreatheonthelooptomakebubbles.Hecontainedhisurgent16tomakebigbubblesbyblowinghardand17myadvice.Bigbubbles. Therearesomethingsthatyoucangetwith18forcebutotherthingslikeloveorrespectonly19thegentlenessofasoftbreath.The20somethingistohigherspiritthemoreitislikebubblesitcan'tbeforced.Blowbeautifulbubblesbreatheeasy. 1A.type B.color C.size D.liquid 2A.excitedly B.willingly C.quickly D.vainly 3A.could .B.would C.might D.should 4A.handed B.lent C.sent D.brought 5A.teacher B.doctor C.chemist D.physicist 6A.bought B.designed C.developed D.used 7A.nearly B.hardly C.partly D.completely 8A.filled B.loaded C.dotted D.crowded 9A.less B.much C.more D.little 10A.flying B.forming C.keeping D.taking 11A.attempts B.performances C.experiments D.adventures 12A.Inadditionto B.Otherthan C.Insteadof D.Inspiteof 13A.touched B.breathed C.felt D.tapped 14A.rushed B.jumped C.dropped D.floated 15A.explained B.whispered C.complained D.shouted 16A.anger B.desire C.manners D.dream 17A.heard B.followed C.shared D.refused 18A.mild B.weak C.powerful D.flexible 19A.resultin B.cometo C.consistof D.arisefrom 20A.dearer B.farther C.smaller D.closer
6分Differentcountrieshavedifferentcustomsespeciallyintablemanners.Somedininghabitsmaybeconsideredcivilizedinonecountrybutrudeinanother.Herearesomeinterestingfactsaboutsomecountries. France WheninFrancesplittingthebillAAwithfellowdinersshouldbeavoidedwhenpossible.You'reexpectedtooffertopaytheentirebillorsomeoneelseisexpectedtodg.so.OfcourseaccordingtoFrenchTodaytherearesomecasesWheresplittingthebillisOKlikewhendiningoutwithalargegroupofpeopleorwithcoworkers. Columbia Ifyou'reusedtocleaningyourplateyoumightwanttoconsidernotdoingsowhendininginColombiaIt'sconsideredrudetoleaveanemptyplatebecauseit'sasifyou'retellingyourhostthatheorshedidn'tgiveyouenoughfood. Australia InAustraliapeopletypicallyprefernottodiscussbusinessmattersoveramealaccordingtoEtiquetteScholarOfcourseitdependsonthepersonorgroupyou'rewithbutyoushouldpayattentiontoanycuesfromyourfellowdiningcompanionsforgoodmeasure. Kazakhstan InAmericait'sprettytypicaltogetannoyedwhenyourbaristadoesn'tfillyourcupalltheup.ButinKazakhstanitactuallyleaveyousatisfiedsinceitisagoodsign.AccordingtoEveryCulturehalf﹣filledcupsaremeanttokeepyourteawarmsinceyourhostwillcontinuouslyfillyourcupasawaytokeeptheinteractiongoingIfyourhostorserverweretofillyourcupwithteahoweveritisasignthattheymightwantyoutoleaveaccordingtoCommisceoGlobal. 1InFrancewithwhomissplittingthebillOKnowwhendining? A.yourchildren B.yoursweethearts C.yourcoworkers D.yourparents 2Inwhichcountryyouhadbetterleavesomefoodontheplate? A.France B.Columbia C.Australia D.Kazakhstan 3InKazakhstanifthehostfillsyourcupwithteaitmeansthat. A.youshouldleave B.youlikethetea C.youarethirsty D.theteatastesgood
在真核细胞的内质网和细胞核中能够合成的物质分别是
集合A＝{x∈N|log2x+1＜2}B＝{x|x≤2}则A∩B的子集个数为
15分Scotlandisauniqueplacewithlonghistorywhereyoucanfindnoble1palaceandcastles.Ithassomeof2mostbeautifulcitiesinEuropelivingwitnessofaproudandexcellentpast. 3discoverthetruesoulofScotlandtodaywehavetogotowardsthenorthernregionstotheGrampianMountainsItwasdifficulttofarmbuttheScotsdefeatedtheenvironmentwithstrongarms.Thehistoryofthisancientstruggleanditspeople'sancientloveforthehardlandare4apparentshownintheAngusFolkMuseum.Youcangetafeelofthetypicalruralatmosphereofpasttimesfromthedailyman﹣madeobjects5displayhere. FromcoastalAberdeen6theinsideoftheGrampianMountainsthererunstheCastleTrailaroadwithmanyfortresses要塞7arewitnessesof8continuefightsagainsttheruleofEnglandinScottishhistory. Another9attracthereisalegendarymonstertheLochNessMonster.Isthismonsterwhich10collectagood3000sightingsoverthelast50yearsrealorimaginary?Tomeetthecuriosityaboutitapriceof500000poundshasbeenputonthemonster'shead.
15分FormorethansixmillionAmericanchildrencominghomeafterschoolmeans1cometoanemptyhouse.SomedealwiththesituationbywatchingTV.Somemayhangoutoutside.2allofthemhavesomethingincommon.Theyspendpartofeachdayalone.They3calllatchkeychildren﹣theyarechildrenwholookafterthemselveswhiletheirparentswork.Andtheirbadsituationhasbecomeasubjectofconcern. Aheadmasterofanelementaryschoolsaidthattherewasaschoolruleagainstwearingjewelry.Alotofkidshadchainsaroundtheirneckswithkeys4attach.Hewasconstantlytellingthemtoputtheminsideshirts.Thereweresomanykeysallof5werehousekeys. Hebegantalkingtothechildrenwhohadthem.Thenhelearnedtheinfluencethatworkingcouplesandsingleparentswerehaving6theirchildren.Fearisthebiggestproblemfacedbychildrenathomealone.Manyhadnightmaresandwereworriedabouttheirown7safe. Themostcommonwaylatchkeychildrendealwiththisisbyhiding.Itmightbeinabathroomunderabed8inacloset.ThesecondisTV.They'llwatchitwiththevolumeturneduphigh.Mostparentsdon'trealize9iteffectontheirchildrenandmostparentsareslowtoadmitthefact10theyleavetheirchildrenalone.
15分假如你是李华最近刚到美国一所大学求学在学习生活上遇到了问题想向导师Mr.Brown求助.请你写封邮件内容包括 1.问题描述2.请求帮助3.预约时间. 注意1.词数80左右2.可以适当增加细节以使行文连贯.
25分阅读下面短文根据其内容写一篇60词左右的内容概要. FormostofussocialmedialikeTwitterandFacebookisapartofoureverydaylives﹣atworkhomeorboth.Butalotofpeoplearestillfiguringoutwhentouseitandhow.Thisisespeciallytrueinhighschoolwheremanyteachersareunsureofhowitfitsintheclassroom. DanKrutkaahighschoolteacherisanadvocateforusingsocialmediaintheclassroomandisanenthusiasticuserofTwitterhimself.Krutkasaysit'sagreatwaytocommunicatewithhisstudentsduringnonclasshours.YoucancontinuetolearntogetheroutsidetheclassroomsaysKrutka.SowhenstudentsarepostingonTwitter﹣saytheypostsomethinginaccuratelyortheymakeareallygoodpoint﹣Icangoaheadandrespondtothembeforeclass. Krutkasaystweetingwithhisstudentsisn'tjustaboutconvenienceit'salesson.Hesaysstudentsneedtolearnhowtousesocialmediaproperly.Peopleusesocialmediairresponsiblyandschoolshouldbeaplacewherewe'retalkingaboutthatandhowtouseitresponsiblyhesays.AsateacherIthinkpartofmyjobistohelpstudentsunderstandhowtomakebestuseofitasthoughtfullearners. ButKrutkaisamongthefeweducatorswhofeelthisway.ManyschoolsincludingthoseinWesternMassachusettsarestillstrugglingwithwhetherornotTwitterorFacebookshouldbeusedasteachingtools.Manyteachersbelievethatsocialmediaingeneralcaneasilydistractstudents.SeanKavanaghaninthgradeworldhistoryteachertriedusingTwitterinclassbutwasdistractedbyallofthenonclassrelatednoise. Besidesitseemsthatsomestudentsdon'tfeellikethiswayeither.RayLynnisinKavanagh'shistoryclass.I'dratherkeepmyschoolandmypersonalsocialmedialifealittlemoreseparateshesays.I'drathernothavemyteacheronmyTwitterorFacebook.
回答下列与生态系统相关的问题． 1在森林生态系统中生产者的能量来自于生产者的能量可以直接流向答出2点即可． 2通常对于一个水生生态系统来说可根据水体中含氧量的变化计算出生态系统中浮游植物的总初级生产量生产者所制造的有机物总量．若要测定某一水生生态系统中浮游植物的总初级生产量可在该水生生态系统中的某一水深处取水样将水样分成三等份一份直接测定O2含量A另两份分别装入不透光甲和透光乙的两个玻璃瓶中密闭后放回取样处若干小时后测定甲瓶中的O2含量B和乙瓶中的O2含量C．据此回答下列问题． 在甲乙瓶中生产者呼吸作用相同且瓶中只有生产者的条件下本实验中C与A的差值表示这段时间内C与B的差值表示这段时间内A与B的差值表示这段时间内．
8分Ifyouaskmostpeoplewhatwatertasteslikethey'llprobablytellyouthatwaterhasnotasteandtheymaygiveyouafunnylook.Butifyouwereafruitflyaskinganotherfruitflythatquestionmighthaveadifferentanswer. Toafruitflywaterhasataste.Scientistswanttoknowhowthefruitflyknowswaterbecausethisinformationmayhelpinlearninghowotheranimalsmanagetousewaterintherightway.Waterisveryimportanttolifebuttoomuchortoolittlecanbedeadlytoalivingcreature.Sobyunderstandinghowthefruitflytasteswaterresearchersmaylearnmoreaboutotherlivingthings. AccordingtothenewstudyaproteincalledPPK28makesitpossibleforaflytotastewater.Proteinsbuildcellsandtissuesfightdiseaseandcarrymessagesbetweencells.It'snotsurprisingthataproteinisresponsibleforthefruitfly'sabilitytotastewater. ThePPK28proteinispartofalargerfamilyofsimilarproteins.Oneoftheserelatedproteinsisusedbymammalsincludinghumanstotastesalt.Scientistshavenotfoundaproteinthatenableshumanstotastewater.IntheexperimentCameronandhisteamcomparednormalfruitflieswithfruitflieswhosetastecellshadhadbeendisabled.ThefruitfliesweregivenaspecialchemicalthatwouldglowwhentheflyusedthePPK28protein.Thenthescientistsledthefliestowater.WhenthenormalfliestastedthewaterthePPK28proteinlitup﹣showingthatitwasinuse.Thefruitflyinparticularissointerestingthatsomescientistsarehardatworkcreatingacompletemapofthefruitflybrain.Thismapwillshowallofafly'sneuronsandhelpscientistsunderstandhowtheneuronsworktogether. 1Howdomostpeoplefeelwhenaskedthetasteofwater? A.Disappointed B.Frightened. C.Amused D.Disgusted. 2Whydoscientistswanttounderstandhowthefruitflyknowswater? A.Todecreasethenumberofthefruitfly. B.Toknowmoreaboutothercreatures. C.Tomanagetousewatercorrectly. D.Todescribethetasteofwater. 3WhatdoweknowaboutthePPk28protein? A.Itcanmakehumanstastesalt. B.Itenablesthefruitflytotastewater. C.Thefruitflycan'tlivewithoutit. D.Thefruitflyusesittoavoidillnesses. 4Whatwillthescientistscontinuetoworkat? A.MakingthePPk28protein. B.Tellingmoreinformationaboutcells. C.Creatingmapsofhumanbrains. D.Studyingthefruitfly'sneuronsystems.
7.5分IntheU.S.stateofWashingtonaroadcalled^Interstate90^cutsthroughawildmountainousareatoreachthecityofSeattle.Forthearea'smanykindsofanimalsthebusyhighwaygreatlylimitstheirmovements.Crossing1﹣90﹣astheroadiscalled﹣isariskybutsometimesnecessaryact.Butsoonanimalswillhaveasaferchoiceforcrossingtheroad.Theywillbeabletogoaboveit. Tohelptheanimalsthestateisfinishingworkonitslargest﹣everwildlifebridge.The11﹣meter﹣tall20﹣meter﹣widestructurebeginsintheforest.Itformstwoarchesabovethehighwayoneforeachdirectionoftraffic.Workersareaddingfencingandplantstohelpguidetheanimalsacrossthebridge.Two﹣meter﹣thickwallswillhelpblocknoisefromvehiclesbelow. The1﹣90BridgeispartofagrowingnumberofwildlifecrossingsacrosstheUnitedStates.Somearefencessomeareoverlandbridgesandsomeareunderpasses.Theyallaimtokeepdriversandanimalsawayfromeachother.Collisionsbetweenanimalsanddriversarerarelydeadlytopeople.Buttheyareoftendeadlytowildlife.InCanada'sBanffNationalParkstudieshavefoundthatwildlifecrossingsreducethearea'sanimal﹣drivercollisionsby80percent. Mostofthewildlifebridgesareinwesternstates.Butexpertshavenotedmanyotherareasthathaveaneedforsuchpaths.JenWatkinswhoseorganizationhashelpedcampaignforanimalcrossingssaysftindformorecrossingsisthenumber﹣onebarrier. PattyGarvey﹣DardaoftheU.S.ForestServicehasworkedonthe1﹣90crossingfromthestartoftheproject.Shesaysthe﹩6﹣millionbridgewillonedaypayforitselfbecausethehighwaywillnothavetobefullyorpartlyclosedeachtimealargeanimalisstruck.ShesaidIfyoushutdownInterstate90youshutdowninterstatecommerce. 1WhatisthepurposeofbuildingthebridgeoverInterstate90? A.Toreducehumandeathsincrashwithwildlife. B.Topreventwildlifefrombeingstruckbyvehicles. C.Toarousepublicawarenessofwildlifeprotection. D.Toprovideasaferchoicetocrosstheriskyroad﹣ 2AccordingtoJenWatkinswhatisthebiggestchallengeincrossingconstruction? A.Findingwaystohelpguideanimalsacrossthebridge. B.Collectingmoneytobuildmorewildlifecrossings. C.Locatingareastoconstructappropriatecrossings. D.Encouragedriverstoobeytheregulationsoftraffic. 3WhatdotheunderlinedwordsinParagraph5imply? A.Thebridgewillprovetobewellworththehighprice. B.Expenseforbuildingsuchbridgeswillbereduced. C.Thebridgewillgreatlypromotetradeandcommerce. D.Livessavedthroughthebridgearedefinitelybeyondprice.
30分Cruz11andAnthony10couldn'tagreewerethebirdsoutontheiceducksorgeese?Therewasonlyonewaytofindout.Soona1Januaryeveninglastyearthetwofriends2ontothefrozenpondneartheirhomesinFrankfortIllinoistogeta3look.Firsttheythrewarockontotheiceto4itthentheysteppedonit.5theicewouldholdtheirweightAnthonytookafewstepsthen…FOOMP.Hecrashed6theseeminglyfrozensurface.TherewasnosoundnocrackhesaidIjustfellthrough7. Cruzrushedtohelphis8friend.FOOMP﹣thepond9himtoo.Theboyswereuptotheirnecksinicywaterandquicklylosing10intheirlimbs.Anychanceoftheirfreeingthemselveswas11.Cruzwassurehewasgoingtodie.Anthony'ssisterhadseenitandstartedscreamingforhelp. JohnLavinaneighbor12nearbyheardherandquicklypulledover.Seeingtheboyshegrabbedanearbybuoy救生圈withonehandkickedoffhis13andranintotheicywaterhittinghiswaythroughtheicewithhisfree14.EventuallyLavin15hiswaytoCruzandAnthonyandpulledthembacktoland.Theyweretakentothe16wheredoctorsdiscoveredthattheirfive﹣minutestayinthewaterhad17theirbodytemperaturenearlytendegrees. 18theboyshavefullyrecoveredthankstotheir19neighbor.JusttothinksaysCruz20hewasn'tthereIcouldhavedied. 1A.warm B.chilly C.rainy D.windy 2A.toured B.rushed C.ventured D.wandered 3A.casual B.actual C.better D.deeper 4A.test B.break C.hit D.see 5A.Bothered B.Persuaded C.Concerned D.Convinced 6A.through B.onto C.in D.across 7A.slowly B.apparently C.instantly D.gradually 8A.discouraged B.panicked C.frustrated D.confused 9A.drowned B.drew C.embraced D.swallowed 10A.balance B.feeling C.faith D.heart 11A.givingaway B.slippingaway C.slippingout D.givingout 12A.driving B.passing C.coming D.walking 13A.bags B.gloves C.shoes D.clothes 14A.fist B.leg C.arm D.finger 15A.felt B.broke C.swam D.made 16A.shelter B.home C.school D.hospital 17A.lowered B.raised C.lessened D.changed 18A.Unexpectedly B.Fortunately C.Naturally D.Immediately 19A.strong B.considerate C.fearless D.friendly 20A.unless B.until C.when D.if
7.5分The13thofJune1325IleftTangiermybirthplacewiththeintentionofmakingthepilgrimagetoMecca去麦加朝圣…toleaveallmyfriendstoabandonmyhomeasbirdsabandontheirnests.SobeginsanoldmanuscriptinalibraryinParis﹣thetraveldiaryofIbnBattuta. AlmosttwocenturiesbeforeColumbusthisyoungMoroccansetoffforMeccareturninghomethreedecadeslaterasoneofhistory'sgreattravelers.DrivenbycuriosityhejourneyedtoremotecornersoftheIslamicworldtravelingthrough44moderncountriesthreetimesasfarasMarcoPolo.LittlecelebratedintheWesthisnameiswellknownamongArabs.InhishometownofTangierasquareahotelacafeaferryboatandevenahamburgerarenamedafterhim. IbnBattutastayedinMeccaasastudentforseveralyearsbuttheurgetotravelsoontookover.InoneadventurehetraveledtoIndiaseekingprofitableemploymentwiththesultan﹣theMuslimrulerofDelhi.Onthewayhedescribedhisgroupbeingattackedintheopencountryby80menonfootandtwohorsemen…IwashitbyanarrowandmyhorsebyanotherbutGodinhisgracepreservedme…InDelhithesultangavehimthepositionofjudgebasedonhispreviousstudyatMecca.ButthesultanhadanunpredictablecharacterandIbnBattutalookedforanopportunitytoleave.WhenthesultanofferedtofinanceatriptoChinaheagreed.IbnBattutasetoffinthreeshipsbutmisfortunestruckwhilehewasstillontheshore.Asuddenstormgroundedandbrokeuptwoshipsscattering散播treasureanddrowningmanypeopleandhorses.Ashewatchedthethirdshipwithallhisbelongingsandslaves﹣onecarryinghischild﹣wascarriedouttoseaandneverheardfromagain. AfteralifetimeofamazingadventuresIbnBattutawasfinallyorderedbytheSultanofMoroccotoreturnhometosharehiswisdomwiththeworld.Fortunatelyheagreedandwroteabookthathasbeentranslatedintonumerouslanguagesallowingpeopleeverywheretoreadabouthisunparalleledjourneys. 1WhatcanwelearnaboutIbnBattutafromthepassage? A.HehadgreatinterestintheIslamicworld. B.Hereturnedtohishomelandtowriteabook. C.HisjourneyswerelessimportantthanMarcoPolo's. D.Hisjourneyswereverycommonforpeopleofthattime. 2TheSultanofDelhigaveIbnBattutaapositionofjudgebecause. A.IbnBattutahadstudiedinMecca B.IbnBattutahadbeenajudgebefore C.IbnBattutahadbeenpopularwithArabs D.IbnBattutahadtraveledtomanycountries 3Whichisthebesttitleforthepassage? A.TheLearnedIbnBattuta B.AVisitortoMecca C.TheTravelsofIbnBattuta D.DesireforAdventures
物质W是一种含氮有机物会污染土壤．W在培养基中达到一定量时培养基表现为不透明．某研究小组欲从土壤中筛选出能降解W的细菌目标菌．回答下列问题． 1要从土壤中分离目标菌所用选择培养基中的氮源应该是． 2在从土壤中分离目标菌的过程中发现培养基上甲乙两种细菌都能生长并形成菌落如图所示．如果要得到目标菌应该选择菌落进一步纯化．选择的依据是． 3土壤中的某些微生物可以利用空气中的氮气作为氮源若要设计实验进一步确定甲乙菌能否利用空气中的氮气作为氮源请简要写出实验思路预期结果和结论即． 4该小组将人工合成的一段DNA转入大肠杆菌使大肠杆菌产生能降解W的酶酶E．为了比较酶E与天然酶降解W能力的差异该小组拟进行如下实验请完善相关内容． ①在含有一定浓度W的固体培养基上A处滴加含有酶E的缓冲液B处滴加含有相同浓度天然酶的缓冲液C处滴加三处滴加量相同． ②一段时间后测量透明圈的直径．若C处没有出现透明圈说明若AB处形成的透明圈直径大小相近说明．
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