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Smoking in places where it is not allowed is an example of bad . A.habits B.activities C.manner...
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高二上学期英语《》真题及答案
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WhenIbeganschoolinthe1stgradeinAmericaneverthoughtI'dspeakfluentEnglish.IstillrememberwhenIwasattheairportwithmyfamilywasso1thatIwasgoingtobeinan2forthefirsttimeheadingtoawhole3country.However.whenIarrivedinAmericafoundwhereverIwentIcould4nothing.Thefirstyearatschoolwasthe5butmostinteresting.WhenIwasbeing6tothefirstImetIkissedheronthecheek7itisatraditioninmymotherlandofChile.Everyonewas8atmykissingher.Thegirl'sfaceturnedredbutIdidn'tunderstandwhatwaswrongandwalkedaway9.Thelanguagebarriermadecommunicationwithothersimpossible.EverywhereIwentIhadtosaySorryIdon't10English.Nottalkingtoanyoneandmakingno11.IdecidedthatIshoulddosomethingaboutit.IturnedtomySpanishteacherforhelp12hedidn'tknowhowtolearnEnglish.SoIaskedhimforpaperswhichhadSpanishwordswithEnglishwordsnexttothem. IstartedtolearnandspeakEnglish.Becausemyfriends'madefunofmy13. IstartedtopracticepronouncingeverywordthatIsaid14repeatedlyandIwasableto15attheendoftheyear.In10thand11thgradesmy16wasinbettershape.Iwasabletotalk.understandandactuallyholdaconversationIwaslearningnewwordspronouncingwordsbetterandtalkingtostrangersasifIhadbeena17speaker. EveryexperienceIhavehadintheUnitedStateshas18methatIcannotalways19aresponseorhelpfromanyoneandI'mresponsiblefortheactionsthatareneededinordertogainsuccess.NotspeakingEnglishinanEnglish﹣speakingcountryhashelpedmetolearnto20myself. 1A.confident B.unsure C.excited D.threatened 2A.event B.process C.plane D.class 3A.new B.free C.similar D.familiar 4A.discover B.learn C.expect D.understand 5A.longest B.worst C.busiest D.easiest 6A.introduced B.appointed C.mentioned D.exposed 7A.once B.since C.though D.until 8A.sensitive B.disappointed C.annoyed D.amazed 9A.relaxed B.inspired C.embarrassed D.exhausted 10A.speak B.explain C.recognize D.select 11A.mistakes B.excuses C.response D.friends 12A.and B.but C.so D.or 13A.background B.preserve C.pronunciation D.appearance 14A.slowly B.incorrectly C.carefully D.loudly 15A.finish B.leave C.graduate D.communicate 16A.body B.life C.design D.attitude 17A.sincere B.limited C.native D.generous 18A.shown B.helped C.handed D.offered 19A.waitfor B.thinkof C.objectto D.startwith 20A.giveoff B.talkthrough C.stickto D.relyon
假如你是李华目前在美国留学.最近你在某网站看到一则信息美国某动物保护组织正在向全球招募志愿者.你想申请该职位.请你用英语给该组织负责人写一封电子邮件内容包括 1.写信的目的 2.自我介绍 3.你的想法. 注意1.词数100左右 2.内容可适当发挥注意行文连贯. DearSirormadam Yourssincerely LiHua
某快餐连锁店招聘外卖骑手该快餐连锁店提供了两种日工资方案方案1规定每日底薪50元快递业务每完成一单提成3元方案2规定每日底薪100元快递业务的前44单没有提成从第45单开始每完成一单提成5元．该快餐连锁店记录了每天骑手的人均业务量．现随机抽取100天的数据将样本数据分为[2535[3545[4555[5565[6575[7585[8595]七组整理得到如图所示的频率分布直方图． Ⅰ随机选取一天估计这一天该连锁店的骑手的人均日快递业务量不少于65单的概率 Ⅱ若骑手甲乙选择了日工资方案1丙丁选择了日工资方案2．现从上述4名骑手中随机选取2人求至少有1名骑手选择方案1的概率 Ⅲ若仅从人均日收入的角度考虑请你利用所学的统计学知识为新聘骑手做出日工资方案的选择并说明理由．同组中的每个数据用该组区间的中点值代替
回答下列与种群数量有关的问题． 1将某种单细胞菌接种到装有10mL液体培养基培养基M的试管中培养并定时取样进行计数．计数后发现试管中该种菌的总数达到a时种群数量不再增加．由此可知该种群增长曲线为型且种群数量为时种群增长最快． 2若将该种菌接种在5mL培养基M中培养条件同上则与上述实验结果相比该种菌的环境容纳量K值填“增大”“不变”或“减小”．若在5mL培养基M中接种该菌的量增加一倍则与增加前相比K值填“增大”“不变”或“减小”原因是．
hileitisimportanttomaintaingoodhabitsitisequallyimportanttolearnhowtobreakbadhabitsifyouwanttoachievesuccessinlife.Herearesometipstogetyoustarted. Thefirststepinbreakingbadhabitsistoidentifythem.Onlyafteridentifyingthemcanyoudecidetodosomethingaboutthem.1ForexampleyoumayaskyourselfIsthehabitholdingmebackfromachievingmygoal?Doesthehabitmakemefeelgoodorbad? 2Thenyoumaylistentothethingsthatpeoplesayaboutyou.Arepeoplesayingthesamenegativethingsaboutyou?It'seasytobecomedefensivewhensomeonesayssomethingaboutuswedon'tlikeandlet'sfaceit.3. Onceyouhaveidentifiedyourbadhabitsit'stimetobreakthem.Firstyoushouldintroducesomethingnewandmeaningfulinyourlifetoreplacethebadhabit.4Ifyouhungaroundatthebarsafterworkreplaceitbygoingtothegyminstead.OrifyousatandwatchedTVforhoursyoumayworkonataskthatneedstobedone. 5Writedowntheeffortsyoumaketochangethemandalsotheresultsofyouractions.Andwritedownhowyoufeelwhenyousuccessfullychangeoneofyourbadhabits.Ifyoucanreadandreflectonhowyoufeelabouttheprogressyou'vemadeitmaymotivateyoutocontinuetoworkonchangingotherthings.
TESCOhasannounceditisbanningthesaleofenergydrinkstoteenagersandthatthebigmovewillbegininweeks.Thesupermarkethasjoinedahostofmajornamesbanningteenagersfrombuyinghighcaffeinehigh﹣sugardrinks.Thegovernmentindicatesthattheprincipalquestiontobedeterminediswhetherthepurchasingrestrictionswillapplyattheageof16or18. TheresaMaysaidtheconsultationwaslinkedtothegovernment'schildhoodobesity肥胖strategyandsaiditwasnecessarytoexaminetheconsumptionofenergydrinksoftenbecausetheyaresoldatcheaperpricesthansoftdrinks. Theprincipalreasonforthebanisthehighlevelofcaffeineintheenergydrinkswhichhasbeenlinkedtoastringofhealthproblemsforchildrenincludingheadandstomachachesaswellassleepproblems. Energydrinksoftenalsohavehigherlevelsofsugarthansoftdrinks.Accordingtogovernmentfiguressugaredenergydrinkshave60%morecaloriesand65%moresugarthannormalsoftdrinksandsugarisoneofthelargestcausesofobesity. JamieOliversaidhewelcomedthebanonenergydrinksalesbecausetoomanychildrenareregularlyusingthemtoreplacebreakfastandteachersfromacrossthecountryhavetoldmehowtheirlessonsaredisruptedbecauseofthesedrinks. ADowningStreetsourceaddedthatthereisnoevidencethatenergydrinkshaveanynutritionalvalueinchildren'sdiet.Thataccountsforthegovernment'sactiononmeasurestotacklechildhoodobesityandimprovechildren'shealth. Themoveisthelateststepinanapproachinrelationtochildhoodobesityandhealth.AccordingtoEuropeanFoodSafetyAuthorityresearchtwo﹣thirdsof10to16﹣year﹣oldsregularlyconsumeenergydrinksalongwith18%of3to10﹣year﹣olds. 1Whatisthequestiontobedecidedforthegovernment? A.Theeffectofenergydrinksonhealth. B.Theagelimitforbuyingenergydrinks. C.Atotalriseinthepriceofenergydrinks. D.Thetimetocarryoutbanonenergydrinks. 2Whatproblemmayenergydrinksleadtoonchildren? A.Headachesandsleepproblems. B.Highbloodpressureandstress. C.Fightandbadsocialrelationship. D.Badschoolacademicperformance. 3WhatdoestheunderlinedwordThatrefertoinPara.6? A.Measuresshouldbetakenaboutchildrenobesity. B.Childrenhaveenergydrinksinsteadofbreakfast. C.Energydrinkshavenonutritionalvalueonchildren. D.Weshouldlimitthesugarcontentinenergydrinks 4Whichofthefollowingisthepassagemainlyabout? A.Amovetopreventretailersfromsellingkidsenergydrinks. B.Researchonhowchildrenfailtostoptakingenergydrinks. C.Agoodwaytoimprovechildren'sclassroomperformance. D.Abanonthesaleofenergydrinkstochildrentofightobesity.
FivemetersbelowthesurfaceoftheNorthSeanearthesouthernmosttipofNorwayEurope'sfirstunderwaterrestaurantisto1complete.The110﹣footlongstructureanoblique斜的concreteslab平板that2looklikeasunkenperiscopestartedinJuly2018andworkisnowunderwaytocompletetheinteriorspredictingthepublicopening3spring2020. Therestaurant4callUnderisthedesignofNorwegianoutfitSnhetta5hasmadeanameforitselfwith6projectsuchastheBibliothecaAlexandrinainEgypttheOsloOperaHousetheNationalSeptember11MemorialPavilionandtherenovationofTimesSquareinNewYork. When7finishthestructure8containabout100guestswithatotalinternalareaofabout500squaremeters5300squarefeet.Ithasthreelevelsofferinguniqueunderwaterviewsofthe9surroundseaenvironmentthrough1011﹣meter36feetwidepanoramic全景的window.
在真核细胞的内质网和细胞核中能够合成的物质分别是
Whatdoesyesterdaymean?Whatdoestodaymean?Andhowabouttomorrow?Mostofusknewlittleaboutthem.SoI'dliketoshareastorytofindtheanswerstothequestions.Iwassittinginthesurgicalwaitingareaatthehospitalwaitingforwordofmywife'soperation.Thesmallroomwasfilledwithotherfamiliesandfriendswhowere1waitingtohearhowtheirlovedonesweredoing. Therewasayoungboysittingquietlyinthe2.Heheldasmallboxof3inonehandandatablet写字板intheother.Everysooftenhe'dplacethetabletonhislapanddrawsomething.AsthehourspassedIbegantoseetheroomalmost4.Andtherewasastrangesilence. DaddywhenisMommygoinghome?theyoungboyaskedbreakingthe5.Tomorrow.hisfatherreplied.Theboypickeduphiscrayons蜡笔and6something onthetablet. I7himashemovedhisfeetbackandforthlookingupattheceilingandthentowardthesunshine﹣filledwindow.When's8Daddy?heasked.Hisfather9himovertositbyhim.Come10herenexttomehesaidwithagentletoneinhisvoice.11histhingsthelittleboywalkedslowlytohisfather'ssidefromthecorner.Theman12outandheldhissonbyhisshoulder. Therearethreedaysinlife.Yesterdaytodayandtomorrow.Oneisoveranddoneoneweliveintheotherwe13.Wecan'tliveinyesterdaybutifwearehappyenoughtodaywewillbeevenhappiertomorrowhesaidinanattemptto14theboy. ThelittleboylookedathimforamomentandsaidIfMommyisgoinghometomorrowI'llbe15.SoIwantittobetomorrowalreadyDaddy. Nowhangingoneverywordofthis16Ileanedforwardtohearhisresponse.Itwas17. Sontheonegreatthingabouttodayisonceit18itisalreadyalmosttomorrow. Ithoughtabouthow19itwas.EveninmyadultlifeIstilllivewaitingforwhattomorrowmay20.NowIknowthatitisalreadyalmosttomorrow. 1A.eagerly B.peacefully C.patiently D.happily 2A.distance B.shadow C.chair D.corner 3A.gifts B.chalks C.toys D.crayons 4A.full B.dark C.empty D.clean 5A.rule B.silence C.record D.promise 6A.wrote B.drew C.expressed D.printed 7A.watched B.followed C.caught D.found 8A.yesterday B.tomorrow C.today D.future 9A.called B.ordered C.knocked D.pulled 10A.sleep B.lie C.lean D.sit 11A.Gathering B.Delivering C.Choosing D.Saving 12A.took B.set C.reached D.got 13A.spend B.kill C.waste D.expect 14A.persuade B.warn C.satisfy D.frighten 15A.calmer B.happier C.smarter D.better 16A.discussion B.story C.opinion D.conversation 17A.silly B.active C.perfect D.humorous 18A.starts B.loses C.gets D.lasts 19A.broad B.meaningful C.interesting D.sincere 20A.happen B.bring C.come D.need
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
Somepeoplewilldojustaboutanythingtosavemoney.AndIamoneofthem.Takemyfamily'slastvacation.Itwasmysix﹣year﹣oldson'swinterbreakfromschoolandwewereheadinghomefromFortLauderdaleafteraweeklongtrip.TheflightwasoverbookedandDeltatheairlineofferedus400dollarsperpersonincreditstogiveupourseatsandleavethenextday.IhadmeetingsinNewYorksoIhadtogetback.Butthatdidn'tmeanmyhusbandandmysoncouldn'tstay.Itookmynine﹣month﹣oldandtookoffforhome. Thenextdaymyhusbandandsonwereofferedmorecreditstotakeanevenlaterflight.YesIencouraged﹣okayordered﹣themtowaititoutattheairporttoearnmoreDeltaDollars.Ourtotaltake1600.Notbadhuh? NowsomepeoplemaythinkI'mabadmotherandnotsuchagreatwifeeither.ButasabigtimebargainhunterIknowthevalueofadollar.Andthesedaysagooddealissomethingfewofuscanaffordtopassup. I'vemadealivinglookingforthebestdealsandexposing揭露theworsttricks.IhavebeentheconsumerreporterofNBC'sTodayshowforoveradecade.IhavewrittenacoupleofbooksincludingonetitledTricksoftheTradeAConsumerSurvivalGuide.AndIreallydowhatIbelievein. Itellyouthisbecausethereisnoshameingettingyourmoney'sworth.I'malsotightfistedwhenitcomestoshoesclothesformychildrenandexpensiverestaurants.ButIwouldn'thesitatetospendonagoodhaircut.Itkeepsitsshapelongerandit'sthefirstthingpeoplenotice.AndIwillalsospendonaclassicpieceoffurniture.Qualitylasts. 1WhydidDeltagivetheauthor'sfamilycredits? A.Theytookalaterflight. B.Theyhadearlybookings. C.Theirflighthadbeendelayed. D.Theirflighthadbeencancelled. 2Whatcanwelearnabouttheauthor? A.Sherarelymissesagooddeal. B.Sheseldommakesacompromise. C.Sheisverystrictwithherchildren. D.Sheisinterestedincheapproducts. 3Whatdoestheauthordo? A.She'sateacher. B.She'sahousewife. C.She'samediaperson. D.She'sabusinesswoman. 4Whatdoestheauthorwanttotellus? A.Howtoexposebadtricks. B.Howtoreserveairlineseats. C.Howtospendmoneywisely. D.Howtomakeabusinessdeal.
TheHomelessHero Formanyfindinganunattendedwalletfilledwith£400incashwouldbeasource来源oftemptation__.Butthe1wouldnodoubtbegreaterifyouwerelivingonthestreetswithlittlefoodandmoney.AllofthismakestheactionsofthehomelessTomSmith2moreremarkable. Afterspottinga3onthefrontseatinsideaparkedcarwithitswindowdownhestoodguardintherainforabouttwohourswaitingforthe4toreturn. Afterhoursinthecoldandwethe5insideandpulledthewalletouthopingtofindsomeIDsohecouldcontact联系thedriveronlyto6itcontained£400innoteswithanother£50insparechangebesideit. Hethentookthewallettoanearbypolicestationafter7anotebehindtolettheownerknowitwassafe.Whenthecar'sownerJohnAndersonandhiscolleagueCarolLawrencereturnedtothecar﹣whichwasitselfworth£35000﹣inGlasgowcitycentretheywere8tofindtwopolicemenstandingnexttoit.ThepolicementoldthemwhatMr.Smithdidandthatthewalletwas9. ThepairwerelaterabletothankMr.Smithforhis10. Mr.AndersonsaidIcouldn'tbelievethattheguynevertookapennytothinkheissleepingonthestreetstonight11hecouldhavestolenthemoneyandpaidforaplacetostayin.Thisguyhasnothingand12hedidn'ttakethewalletforhimselfhethoughtaboutothers13.It'sunbelievable.Itjustprovesthereare14guysoutthere. Mr.Smith'sact15muchofthepublic'sattention.HealsowonpraisefromsocialmediausersafterMr.Anderson16abouttheactofkindnessonFacebook. NowMr.Andersonhassetupanonlinecampaignto17moneyforMr.Smithandotherhomelesspeopleintheareawhichbyyesterdayhadreceived￡8000.Ithinkthefaiththateveryonehasshown18himhastouchedhim.Peoplehavebeenapproachinghiminthestreethe'shadjob19andallsortsMr.Andersoncommented. ForMr.Smiththisisapossiblelife﹣changing20.Thestoryonceagaintellsusthatonegoodturndeservesanother. 1A.hope B.aim C.urge D.effort 2A.still B.even C.ever D.once 3A.wallet B.bag C.box D.parcel 4A.partner B.colleague C.owner D.policeman 5A.turned B.hid C.stepped D.Reached 6A.discover B.collect C.check D.believe 7A.taking B.leaving C.reading D.writing 8A.satisfied B.excited C.amused D.shocked 9A.safe B.missing C.found D.seen 10A.service B.support C.kindness D.encouragement 11A.when B.if C.where D.because 12A.rather B.yet C.already D.just 13A.too B.though C.again D.instead 14A.honest B.polite C.rich D.generous 15A.gave B.paid C.cast D.drew 16A.learned B.posted C.cared D.heard 17A.borrow B.raise C.save D.earn 18A.of B.at C.for D.in 19A.details B.changes C.offers D.applications 20A.lesson B.adventure C.chance D.challenge
设函数fx＝ex﹣lnx﹣1其中e是自然对数的底数 1求证函数fx存在极小值 2若∃x∈[+∞使得不等式﹣lnx﹣≤0成立求实数m的取值范围．
设函数fx＝|x﹣m|+|x+n|其中m＞0n＞0． 1当m＝1n＝1时求关于x的不等式fx≥4的解集 2若m+n＝mn证明fx≥4．
Afoodadditive添加剂isanysubstancethatisaddedtofood.Manypeopleareputoffbytheideaofchemicalsinfood.Thetruthisthatallfoodismadeupofchemicals.Naturalsubstances物质likemilkaswellasman﹣madeoneslikedrinksonsaleinthemarketcanbedescribedbychemicalformulas.Somechemicalsubstancesareindeedharmfulbutapersonwhorefusedtoconsumeanychemicalswouldfindnothingtoeat. Thethingsweeatcanbedividedintonaturalandman﹣madesubstances.Somepeoplefeelthatonlynaturalfoodsarehealthyandthatallman﹣madeingredientsaretobeavoided.Butmanynaturalchemicalsfoundinplantsandanimalsareharmfulwheneatenandsomelaboratory﹣madesubstancesincreasethenutritionalvalueoffood.Otherchemicalshavenaturalandman﹣madeformsthatareexactlyalikevitaminCisvitaminCwhetheritcomesfromatesttubeorfromanorange.Likechemicalman﹣madedoesn'tnecessarilymeannotfittoeat. Foodadditivesareusedformanyreasons.Weaddsugarandsaltandotherthingstofoodsweprepareathometomakethemtastebetter.Foodproducershavedevelopedarangeofadditivesthatstabilizethickenhardenkeepwetkeepfirmorimprovetheappearanceoftheirproducts. Additivescanmakefoodmoreconvenientornutritiousgiveitalongershelflifeandmakeitmoreattractivetotheconsumerthusincreasingthesalesandprofitsoftheproducers. Foodadditivesarepresentlythecentreofastormofseriousargument.Foodproducershavebeenknowntouseadditivesthathavenotbeenprovedsafesomesubstancesincommonusehavebeenprovedunsafeandhavebeentakenoffthemarket.Manypeoplefeelthere'sariskofeatingfoodtowhichanythinghasbeenadded.ButfoodadditivesarenowregulatedbytheFDAofthefederalgovernmentandnewadditiveswillgothroughstricttestingbeforetheycanbeplacedonthemarket.Formostpeoplethechancesofdevelopingserioussideeffectsfromthelong﹣termuseofpresentlyapproved批准foodadditivesareverysmall. 1Fromthepassagewecanlearnthat. A.itisrighttorefusechemicalsinfood B.allfoodshavechemicalsubstances C.foodadditivesareharmfultoourhealth D.naturalfoodsaremuchsaferthanman﹣madeones 2WhichofthefollowingisTRUEaccordingtothepassage? A.Foodswithoutadditivescankeepamuchlongershelflife. B.Foodswithmoreadditiveshavehighernutritionalvalue. C.ToensurefoodsafetytheFDAwillstopfoodadditives. D.Foodadditivescanimprovethequalityoffoodsinmanyways. 3Accordingtothewriterthefoodadditiveis. A.poisonous B.worrying C.avoidable D.acceptable
Theownerofthegasstationnearmyhousepostsdailyinspirationalquotes引说onaboardsuchasWhenyouforgiveyouheal.Whenyouletgoyougrow. MostofthequotesarethoughtfulbutonequotewasformeanentirelynewthoughtBewhoyouneededwhenyouwereyoung. Isthequotesuggestingweshouldbethekindofpersonweneededwhenwewereyoung﹣forourselves?Orthatweshoulddoitforourchildrenandgrandchildrenandotheryoungpeoplewemeet? Maybeweshoulddoitforallofusbothyoungandold? WhywouldIchoosetogivesomuchthoughttoaquotefromagasstationboard?Sometimeswhenmytrainofthoughtleavesthestationjusthavetojumponboardandseewhereittakesme.I'vebeenridingthistrainfordays.thinkingaboutapersonIneededwhenIwasyoung. Mymotherworkedatafactory.OnedaywhenIwas12IcamehomefromschoolandfoundherdrinkingicedteawiththeprettiestladyIhadeverseen.Hellochild!saidthewomancuppingmyfaceinherhands. HernamewasMayandshesmiledalot. Shewasmymother'sfriendbutshebecamemyrolemodel.afriendwhoseadviceIcouldalwaystrust. IsoonbeganspendingasmuchtimeasIpossiblycouldwithMay.ItoldhereverythingmyhopesandfearsandespeciallyallthethingsIdidn'tknow. Iwatchedhowshelistenedandencouragedandneverspokeillofanyoneeveniftheydeservedit.Howshewasalwayskindtoeveryone.Shewasawisewomanoffaithandgrace. Iwantedtobelikeher. AfterIlefthomeforcollegeMaymovedawayand1neverheardofheragain. Thankstoaquotefromagasstationboard」thoughtofmyfriendMaysomeoneIneededwhen1wasyoungandstillhopetobelike. Wedon'talwaysmirrorpeopleweadmire.Butrememberingthemremindsustokeeptrying. 1WhatdoestheunderlinedworditinParagraph4referto? A.Offeringentirelynewthoughtsonlife. B.Beingahelpfulandadmirableperson. C.Postingdailyinspirationalquotes. D.Thinkingaboutthemeaningsofdifferentquotes. 2WhatdoestheauthortellusaboutMay? A.Shetookprideingivingadvicetoothers. B.Shebecamearolemodelformanypeople. C.Shewaspatientandsupportiveofothers. D.Shewasperhapsmorekindthanwise. 3Howdoestheauthorthinkpeopleshouldlearnfrompeopletheyadmire? A.Byfollowingtheiradvice. B.Byputtingthemselvesintheirshoes. C.Bycontinuingtothinkaboutthem. D.Bytryingtheirbesttobethatkindofperson. 4Whatisthebesttitleofthisarticle? A.AGoodFriendOfTheAuthor B.AWiseWoman C.AMuch﹣neededRoleModel D.TheStepsToFollowYourModel
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
氮元素是植物生长的必需元素合理施用氮肥可提高农作物的产量．回答下列问题． 1植物细胞内在核糖体上合成的含氮有机物是在细胞核中合成的含氮有机物是叶绿体中含氮的光合色素是． 2农作物吸收氮元素的主要形式有铵态氮NH4+和硝态氮NO3﹣．已知作物甲对同一种营养液以硝酸铵为唯一氮源中NH4+和NO3﹣的吸收具有偏好性NH4+和NO3﹣同时存在时对一种离子的吸收量大于另一种．请设计实验对这种偏好性进行验证要求简要写出实验思路预期结果和结论．
某研究小组切取某种植物胚芽鞘的顶端分成甲乙两组按下图所示的方法用琼脂块收集生长素再将含有生长素的琼脂块置于去顶胚芽鞘切段的一侧一段时间后测量胚芽鞘切段的弯曲程度α角测得数据如下表据此回答问题． 1生长素在胚芽鞘中的运输属于极性运输这种运输的方向是． 2上图中α角形成的原因是． 3据表可知乙组中左右两侧的琼脂块所引起的α角基本相同但小于甲琼脂块所引起的α角原因是．
假设你是高三学生李津你的加拿大笔友Daniel来信向你求助.他最近和妈妈闹矛盾因为妈妈不让他过多上网.他对此很不理解.请你给他写一封回信要点如下 1建议他向妈妈道歉 2说明过多上网的危害 3列举一些健康的休闲方式. 注意1词数不少于100 2可适当加入细节使内容充实行文连贯 3开头和结尾已给出不计入总词数. DearDaniel I'mverysorrytohearthataconflictoccurredbetweenyouandyourmotherbecauseofyourInternetaddiction. Yours LiJin.
假定英语课上老师要求同桌之间交换修改作文诸你修改你同桌写的以下作文.文中共有10处语言错误.毎句中最多有两处.每处错谋仅涉及一个单词的増加删除或修改. 堆加在缺词处加一个編字符号Λ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岀修改后的词. 注意1毎处错误及其修改均仅限一词 2只允许修改10处多者从11处起不计分. DearTim IknowyouarefondofsportsbutI'mgladtotellyouthatmyschoolwillstartatabletennisclub.Iamwritingtoinviteyoutojoinit. Asweknewplayingtabletennisaregoodforhealth.Tostartwithwhenyouplaytabletennisyouhavetorunbackandforthtocatchballwhichworksoffyourenergeticandkeepsyouhealthy.Secondlytheycanimproveyourbalanceandkeeponyourbrainsharp.Besidesitisagoodchanceforyoutodevelopingfriendshipwithotherswhoshowthesameinterestsintabletennis. Iwillbegreatlypleasingifyouacceptmyinvitation.Lookingforwardtoreceivingyourearlyreply. Yours LiHua
回答下列与细菌培养相关的问题． 1在细菌培养时培养基中能同时提供碳源氮源的成分是填“蛋白胨”“葡萄糖”或“NaNO3”．通常制备培养基时要根据所培养细菌的不同来调节培养基的pH其原因是．硝化细菌在没有碳源的培养基上填“能够”或“不能”生长原因是． 2用平板培养细菌时一般需要将平板填“倒置”或“正置”． 3单个细菌在平板上会形成菌落研究人员通常可根据菌落的形状大小颜色等特征来初步区分不同种的微生物原因是． 4有些使用后的培养基在丢弃前需要经过处理这种处理可以杀死丢弃物中所有的微生物．
Weshouldnevergiveupwhenwe'rechallenged.Thefollowingthreeactresseshavesetagoodexampletous. SarahJessicaParker WhenParkerwaslittleshehadtotakeupsinginganddancingtohelpfeedherbigfamily. DespitehardtimesParker'smomencouragedherchildren'sinterestinthearts.WhenParkerwas11yearsoldthefamilytookatriptoNewYorkCitysoParkercouldaudition试演foraBroadwayplay.Thetripwasasuccess﹣sheandherbrotherwerebothcastandthenthefamilymovedto NewYork.ParkercontinuedtoworkhardandlandroleseventuallybecomingthetitlecharacterofafamousTVshow. EmilyBlunt BeforeBluntwasnominated提名forGoldenGlobesandlandingleadingrolesonthestageandbigscreenshecouldhardlyholdaconversationwithherclassmatesBetweenages7and14Emilyhadamajorstutter口吃.Butthatallchangedwhenoneofherjuniorhighteachersencouragedhertotryoutfortheschoolplaywhichshethoughtwasatotallyunappealing无吸引力的thingatfirstduetothefactthatshehadsuchahardtimecommunicating.Theteachersuggestedshetryaccentsandcharactervoicestohelpgetthewordsoutanditworked.BytheendofherteensBlunthadovercomeherstutterandwentontoachievethesuccessfulcareershehasnow. ShaniaTwain Twain'scareeractuallybeganmoreoutofnecessitythanrawambition.Hermomandstepfatheroftencouldn'tmakeenoughtogetbysoTwainstartedsinginginbarstomakeextramoneywhenshewasjusteightyearsold.Sherecallshermotherwakingherupatallhourstogetupandperform.Sadlywhenshewas21hermotherandstepfatherwerekilledinacaraccidentonthehighway. Twainputhercareeronholdtostepinandtakecareofheryoungerbrothers.OnlywhenheryoungestbrothergraduatedfromhighschooldidshefeelitwasOKtoheaddowntoNashvilletopursuehercareer. 1WhydidParker'sfamilygotoNewYorkCitywhenshewas11? A.aTVshowwaswaitingforParker B.Parkerplannedtolearntheartsthere C.Parker'sfamilywantedtotravelthere D.Parkercouldtryoutforaplaythere 2WhatwasherfirstreactionwhenBluntwasadvisedtotryoutfortheschoolplay? A.Excited. B.Uninterested. C.Angry. D.Touched. 3InordertoTwainstoppedpursuinghercareerat21. A.shewantedtofinishhereducation B.sheexperiencedacaraccident C.shedecidedtolookafterherbrothers D.shewantedtotakeabreak 4WhatdidParkerandTwainhaveincommonwhentheywereyoung? A.Theyhelpedsupporttheirfamily. B.Theyhaduncaringparents. C.Theywantedtobecomefamous. D.Theyhadanunhappychildhood.
WhenIwasachildnotmanyofusgrewupwithpetsinAsia.Itwasunusualtoshowsympathytowardsanimals.Welearntrespectforoureldersandforourgovernmentandwelearntetiquette礼仪toobutrarelywasitsuggestedthatweextendanyfeelingstowardsanimalsorindeedthatanimalshavefeelings.AndbecauseofthismanychildreninAsiagrowupconsideringanimalsexisttoserveusfeedusentertainusandclotheus. Ico﹣foundedACTAsiain2006withanAsianvettosupportthedevelopmentofcaringsocietiesinAsia.Whilemanynonprofitswerealreadyaddressinghumananimalandenvironmentalconcernswithdirectaction1felttheculturalshockbetweencontinentswastoogreattoignore.Wehadtoacceptthatchangewouldnothappenimmediatelyandthatintervening干预wouldcauseoffense.Firstwehavetohelpsocietiesunderstandtheinterdependenceofpeopleanimalsandournaturalhabitat.Insteadofsteppingintofindfaultwesteppedbackandconsideredthecause.Millionsofpeoplelivebelowthepovertylineandmostleft﹣behindchildrenlivewithouttheirparentssoitwasclearthatourbiggestbarrierwasignorancenotcruelty. Withthefutureinmindeducationisatthecoreofallwedo.Weshouldteachchildrenaboutrespectandkindnessandweseethatasenseofresponsibilityisimproving.Bydoingsotheyaredevelopingakeensenseofrespecttoreachotherforallspeciesandournaturalenvironmentbutalsoforthemselves.Giventhechancetounderstandthetruthaboutlifeonearthmanypeople﹣butchildreninparticular﹣willchoosecompassion同情overcruelty. 1WhatweretheAsianchildrenlikewhentheauthorwasachild? A.Theyneverkeptpets. B.Theyhadnocompassion. C.Theydidn'tpayattentiontotheirbehavior. D.Theytookitforgrantedthatanimalsservehuman. 2WhatisthepurposeoftheACTAsia? A.TofindthecausesofpovertyinAsia. B.Toappealtopeoplenottokillanimals. C.ToimproveAsian'ssenseofcaringsocieties. D.Tohelpsolvethecultureshockbetweencountries. 3Whatcanweinferfromthesecondparagraph? A.Directactionofmanynonprofitswasefficient. B.Thechangeofcaringsocietieswouldappearsoon. C.Peopleanimalsandournaturalhabitatexisttogether. D.Thebiggestbarrierofuswasnotignorancebutcruelty. 4WhatdoestheauthorthinkofpresentAsianchildren'ssenseofcaringsociety? A.Itishopeless. B.Itissatisfying. C.Itisannoying. D.Itisuncertain.
DownthestreetsofPortsmouthmorethantwohundredyearsagosaidLt.GeneralIraC.Eakerinaspeechwalkedasailorwithonearmandoneeye.IndeedhewouldprobablyhavebeeninahomeforincurableswerehisnamenotHoratioNelson.Theman'sspiritdrovetheflesh. Bornin1758Nelsonwasasmallandweakchildwholovedsailing.AsayoungteenagerhejoinedtheBritishNavyandwhileonajourneycaughtafeverthatseriouslydamagedhishealth.Butheneverallowedthistoholdhimback.At18hewasappointedalieutenant上尉intheRoyalNavyandbytheyear1803wasmadecommander﹣in﹣chiefoftheBritishfleet舰队. Twoyearslateron21OctoberattheBattleofTrafalgarNelsondefeatedthecombinedFrenchandSpanishfleets.ThisnavalvictorylefttheBritishincontroloftheseasfortherestofthe1800's.UnfortunatelyNelsonwasfatally致命地woundedduringTrafalgarbutlivedlongenoughtoknowthathisfleethadwonthebattle. Nelsonbelievedinhiscountryinhiscauseandinhimself.Heprovedthiswithhiswordsandmoresowithhislife. TheBritishphilosopherJohnStuartMillwouldagree.HesaidOnepersonwithabeliefisequaltoaforceofninety﹣ninewhoonlyhaveinterest.Whyisthisso?Beliefsareremarkablypowerfulinthattheyaretoourliveswhatarudder舵istoaship.Thatistheycontrolthedirectionofourlives.SimplyputifIbelieveIamafailureIwillsetmyselfuptofail.IfIbelieveIamasuccessfulpersonIwillsucceed. Dr.JoyceBrotherswell﹣knownauthorandpsychologistsaidAperson'sself﹣conceptisthecentralpartofhispersonality.Itaffectseveryaspectofhumanbehavior.It'snoexaggeration夸张tosaythatastrongpositiveself﹣conceptisthebestpossiblepreparationforsuccessinlife. 1WhichofthefollowingcanbeusedtodescribeNelson? A.Honestandmodest. B.Cautiousandfriendly. C.Braveanddetermined. D.Considerateandoptimistic. 2Whydoestheauthormentiontherudderandtheship? A.Toexplainthekeyroleofbeliefs. B.Toshowtheimportanceofrudders. C.ToexplainthebeliefsofJohnStuartMill. D.Toshowthedifficultyofcontrollingdirections. 3Whatisimportantforsuccessaccordingtothelastparagraph? A.Ability. B.Courage. C.Character. D.Confidence. 4Whatisthetextmainlyabout? A.AUKphilosopher'sideas. B.AnunusualBritishsailor. C.TheBattleofTrafalgar. D.Thepowerofbeliefs.
每句中只有一处错误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Λ并添加单词. 删除把多余的词用斜线\划掉.修改在错的词下划一横线并修改.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. Inmyschoollifeamostunforgettablepersonismymathteacher.Notonlydidshehelpedusinclassbutalsoafterclass.IstillrememberthetimethatIgotaBinthefinalexam.Ilikedmathbestbuttheteachertookprideinmeallthetime.HoweverIfailed.IfeltsodisappointingthatIlostmyenergyandconfident.ThenonedayIhappenedmeetherinthestreetandmyfaceturnedredrightaway.Shetoldmenottogiveupandencouragemetoworkmuchmoreharder.Latersheofferedmeagreatmanysuggestionsonlearningmath.Inadditionshecaredformyfeelings.WithherhelpImadegreatlyprogress.
下列关于人体组织液的叙述错误的是
下列不利于人体散热的是
下列有关高尔基体线粒体和叶绿体的叙述正确的是
TeenVolunteers Thezoosupportsfutureconservationbyhavingtheyouthinvolvedinvoluntaryjobs.Wehavepopularsummeryear﹣roundprogramsthataredesignedtobefunandeducationalwhilebuildingjobreadinessskillsandinspiringyouthtoappreciatecareforandconservenature. ◆ZooCrew VolunteeronateamtorestorewildlifehabitatatLakeMercedandMountainLakeinSanFrancisco. Ages11﹣14 ProgramrunsSeptemberthroughJune HoursOneSaturdaypermonthform10amto12pm TheZooCrewwillholdanecessarytrainingforallprospectivevolunteersinAugustattheZoo. ◆NatureTrail NatureTrailersworkincloseproximity接近totheZoo'sambassadoranimalcollectionandteachguestsaboutadaptationsandconservation.NatureTrailerswilllearntohandleafewsmallmammalsandreptiles. Ages12﹣14mustbe12byMemorialDay ProgramrunsMemorialDaytoLaborDay Hours2daysperweek10amto445pm ◆TalkontheWildSide Learntohandleamazinganimalslikelivestockandarthropods节肢动物whilegivinginformationaltalkstozoovisitors.Usebiofactcartstoeducatethepublic. Ages14﹣17 ProgramrunsMemorialDaytoLaborDay Hours2daysperweek930amto430pm ◆ZooTeacherAssistant HelpkidsexploretheworldofanimalsthroughzootourscraftsgamesandassistZooCampteacherswithactivities.Gainpracticalworkexperiencewithchildren. Ages14﹣17 Programrunsmid﹣Junethroughmid﹣August HoursAdailyhalf﹣dayorfull﹣dayshiftforaminimumoffourweeksoverthecourseofthesummer. 1WhyareyouthvolunteersofferedjobstoworkattheZoo? A.Tohelpteenagersearnsomemoneyfortheirschooling. B.Tohelpteenagersgeteducatedandgainexperience. C.Togiveteenagersmuchfunduringholidays. D.Toencourageteenagerstoloveandprotectnature. 2Whatdoesavolunteerdoasanaturetrailer? A.PlaytheroleoftheZoo'sambassador. B.TellthevisitorstocarefortheZoo. C.Helptotreatsomesmallanimalswithcare. D.Learnhowtoprotectthesmallmammalsandarthropods. 3Inwhichactivitycanyouworkwithkidstoexploretheworldofanimals? A.ZooCrew. B.NatureTrail C.TalkontheWildSide D.ZooTeacherAssistant.
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