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要得到函数y=sin(2x﹣)的图象,需将函数y=sin2x的图象( )
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高一下学期数学《》真题及答案
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要得到函数y=cos2x+1的图象只需将函数y=cos2x的图象向左平移个单位长度即可.
把函数y=fxx∈R的图象上所有点向右平行移动个单位长度再把所得图象上所有点的横坐标伸长到原来的2倍
y=sin(2x﹣
),x∈R
y=sin(
),x∈R
y=sin(2x
),x∈R
y=sin(2x
),x∈R
要得到函数y=sin4x﹣的图象只需将函数y=sin4x的图象
向左平移
单位
向右平移
单位
向左平移
单位
向右平移
单位
要得到函数y=2sin的图象可将函数y=2sin的图象上.
要得到函数y=sin的图象可以把函数y=sin2x的图象
向左平移个单位
向右平移个单位
向左平移个单位
向右平移个单位
若要得到函数y=sin2x﹣的图象可以把函数y=sin2x的图象
向右平移
个单位
向左平移
个单位
向右平移
个单位
向左平移
个单位
.函数fx=Asinωx+φ
>0,ω>0,|φ|<
)的部分图象如图示,则将y=f(x)的图象向右平移
个单位后,得到的图象解析式为( )
A.y=sin2x
y=cos2x
y=sin(2x+
)
y=sin(2x﹣
)
要得到函数y=sin2x﹣的图象只需将函数y=sin2x的图象
向左平移
个单位
向右平移
个单位
向左平移
个单位
向右平移
个单位
已知函数y=gx的图象由fx=sin2x的图象向右平移φ0<φ<π个单位得到这两个函数的部分图象如图
要得到函数y=sin2x﹣的图象可将函数y=sin2x的图象向右平移个单位.
要得到函数y=sin的图象只需将函数y=sin4x的图象向平移个单位长度.
有下列说法①函数y=-cos2x的最小正周期是π②终边在y轴上的角的集合是③在同一直角坐标系中函数y
要得到函数y=sin2x﹣的图象只需将函数y=sin2x的图象
向左平移
向右平移
向左平移
向右平移
将函数y=sin2x+cos2x的图象向左平移个单位长度所得图象对应的函数解析式可以是.
y=cos 2x+sin 2x
y=cos 2x-sin 2x
y=sin 2x-cos 2x
y=sin xcos x
要得到函数的图象只需将函数y=3sin2x的图象向右至少平移个单位.
要得到函数y=cos2x﹣的图象只需将函数y=sin2x的图象
向左平移
个单位
向左平移
个单位
向右平移
个单位
向右平移
个单位
要得到函数y=sin2x﹣x∈R.的图象只需将函数y=sin2xx∈R.图象上所有的点
向左平行移动
个单位长度
向右平行移动
个单位长度
向左平行移动
个单位长度
向右平行移动
个单位长度
要得到函数y=sin2x﹣的图象只需将函数y=sin2x的图象
向右平移
个单位
向左平移
个单位
向右平移
个单位
向左平移
个单位
将函数y=fx·sinx的图象向右平移个单位后再作关于x轴对称变换得到函数y=1-2sin2x的图象
sin x
cos x
2sin x
2cos x
要得到函数y=sinx的图象只需将函数y=sinx+的图象
向左平移
个单位
向右平移
个单位
向左平移
个单位
向右平移
个单位
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油菜素内酯BR可提高水稻对真菌细胞壁成分为几丁质的抗性.为研究其分子机制科研工作者用BR对水稻进行了处理并检测了实验组和对照组水稻叶片几丁质酶的活性结果如图1所示同时提取了实验组和对照组水稻细胞中总RNA进行反转录并对其产物进行PCR后电泳处理结果如图2所示18S为参照.据图分析下列说法不正确的是
Thechoirrehearsal合唱排练oftheschoolyeartookplaceintheschoolhall.Allthestudents1 togethertosing.Iwatchedasmyeldersisterandhergradetooktheirplacesonthe2MeanwhileIcouldhearsomestudentslaughingand3atagirlnexttomysister.I'dneverseenthisgirlbefore.Agirl4inmyearDoyouknowshe's5diapers纸尿裤? AfterschoolthateveningIaskedmysisteraboutthegirlthatIsaw.ShetoldmehernamewasTheresaandthatshewasanicegirl.Whywerethosekidsbeing6toher?Iasked.Becausethey're7shesaid. OnedayIwaswalkinghomefromschoolwhenIheardvoicesbehindmeThere'sthelittleidiot's白痴的youngsister.Doesyoursisterwether8too?Iwalkedfasterandthenfeltastone9meintheback.WhenIgothomeIpushedmywayintoherroom10atherWhydoyouhavetobethatgirl's11?Idon'tseeanyoneelsebeing12toher.JanelleyelledbackBecauseshe'sawonderfulpersonandshe's13!Iwillrememberthosewords14Ilive.Theresawettedhertrousersbecauseshehadan15whichwaskillingher.Mysistertheonlyoneniceenoughtobeherfriendandstickupforher.Severalmonths16Theresa17. Ifelt18thatJanellewasmysister.Throughouttheyearsshealwaysmadefriendswitheveryone.Itdidn'tmatterwhethertheywerebrilliantornot?Sheneverleftanyonefeeling19.Itwasshewho20meandtaughtmenevertolookatanyoneinthesamewayagain. 1A.pulled B.joined C.lived D.crowded 2A.stand B.room C.stage D.bench 3A.pointing B.glaring C.aiming D.glancing 4A.threw B.yelled C.shouted D.whispered 5A.wearing B.dressing C.putting D.carrying 6A.kind B.friendly C.rude D.merciful 7A.interesting B.polite C.generous D.stupid 8A.trousers B.shoes C.socks D.coat 9A.beat B.hit C.blocked D.touched 10A.glaring B.screaming C.staring D.talking 11A.friend B.classmate C.singer D.teacher 12A.tough B.nice C.terrible D.cruel 13A.arriving B.approaching C.dying D.recovering 14A.atthesametime B.themoment C.aslongas D.assoonas 15A.problem B.dream C.kindness D.illness 16A.ago B.before C.away D.later 17A.diedout B.becamewell C.fadedout D.passedaway 18A.disappointed B.shamed C.proud D.ashamed 19A.wise B.alone C.awesome D.fearful 20A.changed B.scared C.developed D.improved
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Keepingadiaryisoneoftheuseful1waytoimproveourEnglishability. 2comparewithotherformsofwritingitisshorterandtakes3littletime.ItcanhelpustodevelopthehabitofthinkinginEnglish.Ifwepersistinthispracticegraduallywe'lllearnhowtoexpress4weinEnglish.WekeepadiaryinEnglish5canhelpusdealwithmanydifficulties.Inthefirstplaceitoftenhappensthatwehavetrouble6findproperwordsandphrasestogiveexpressionstoourmind.SecondlytherearemanyidiomaticwaysofsayingthingsinChinese.Andit's7extremehardforustoputthemintoEnglishproperly. ManyyearsagomyEnglishteachercameupwithasuggestionthateverystudent8haveanotebookandaChinese﹣Englishdictionarywithineasyreach.Wheneversomethingbeatsuswecanfirstputitdowninournotebookandthenconsultourdictionary.WecanalsoaskourEnglishteacherforhelpifnecessary.InshortIbelievethatitis9greatusetokeepadiaryinEnglishfor10developmentofourwritingskills.
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他设法阻止了他儿子独自去游泳.managepreventfrom
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ManyyearsagoIworkedonamidnightshift夜班inahospitalinIndiana.Iwas1moneytogobacktocollege.Someofthepeopleonthatshiftcouldbe2.whichworemedownandmademelessdetermined.3therewasonewomanwhowasvery4andalwayssokindOther5wouldwanttotalktoheronbreaksbecausetheywouldleavefeelingmuch6. BecauseofmyAsperger'sSyndrome阿斯伯格综合症Iwas7somebasicsocialskillslikecommunicationcausingmuch8inmydailylife.Luckilysheshowedgreatcareandacceptedthemistakesone9makesinhisearlyteens.The10sheshowedhelpedmefigureoutwhattodonext.AndI11adifficulttimewhenlifewasverydarkforme.Ireturnedtoschooltocontinuemy12andgraduatedatlast. I'vefelt13topassherkindnessontoothersandIhavetriedtodoso.Hersmall14ofkindnesshasbeenrepaidmanytimes.Wehavetwo15inlife:kindnessorviolence.Eitherisagiftthatkeepsongiving.Whenyouknowthatyourgiftswillberepaidmorethanabilliontimesdoesn'tthechoiceseem16? Ichoosekindnesswheneverpossible.Idonot17anyofthechoicesI'vemadefromkindness.ButIdofeelsorryformanyofthechoicesImadefromviolence.IwishIcould18thatwomannowthoughIhavenoideawheresheis.Shehas19mylifeinawaythatshe'llneverknow.Andnowtheripples涟漪ofherkindness20throughmetomanyothers. 1A.collecting B.borrowing C.earning D.paying 2A.unlucky B.sensitive C.stubborn D.unfriendly 3A.Besides B.However C.Thus D.Indeed 4A.grateful B.cheerful C.doubtful D.forgetful 5A.strangers B.patients C.schoolmates D.workmates 6A.better B.healthier C.braver D.smarter 7A.tiredof B.shortof C.curiousabout D.concernedabout 8A.trouble B.danger C.violence D.loss 9A.suddenly B.finally C.normally D.gradually 10A.devotion B.satisfaction C.kindness D.forgiveness 11A.steppedinto B.sortedout C.cameacross D.pulledthrough 12A.research B.education C.performance D.exploration 13A.moved B.relaxed C.relieved D.surprised 14A.topic B.gift C.habit D.tip 15A.opinions B.chances C.beliefs D.choices 16A.clear B.funny C.foolish D.brief 17A.regret B.forget C.expect D.refuse 18A.please B.admire C.thank D.help 19A.ruined B.controlled C.designed D.affected 20A.burst B.float C.flow D.jump
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Eventhougharecentstudyshowsnapping小睡hassomethingtodowithhigherdeathratescompaniesandcollegesacrosstheU.S.aresettingupnaproomstoincreaseefficiency效率.Trulyitwouldbeadreamtoreachanagreementonnapping. Butwhetherornotnappingisrightforyoudepends.Firstofallit'simportanttoaskyourselfwhyyou'retakingthenapsaysDr.SaraMednickapsychologistattheUniversityofCalifornia.Ifyou'respendingmuchofyourdayfeelingsleepythenyourdesiretonapmaybedrivenbystressorotherhealthconditionsthatbadlyaffectyoursleepMedmcksays. DaytimenappingisanearlysignofpossibleillhealthaddsYueLengaUniversityofCambridgesleepresearcher.LikeMednickhesuggestsdaytimesleepinessislikelyasignofotherhealthproblemsnottheircause. Putsimplyblaming指责napsforhigherdeathratesislikeblamingyourdoctorforheartdisease;you'remorelikelytoseeadoctorifyouhaveheartproblemsbutthatdoesn'tmeanshe'stoblame. ActuallynapsaregoodformostpeopleMednicksays.Herresearchshowsanapcanimprovebrainfunctionsrangingfrommemorytofocusandcreativity.Moreresearchshowsaquicknapcanlowerstressandrechargeyourwillpower.ButallofthesebenefitsdependonyougettingagoodnightofsleeptobeginwithMednickstresses. Howevernoteveryoneisagoodnapper.Somepeoplewakeupfromnapsfeelingterribleshesays.Ifyou'veneverbeenanapperbutwanttocashinonnapping'sbrainandhealthbenefitsMednicksaysyoumaybeabletoteachyourselftonap.Thetrickistokeepyourdaytimeshuteyeveryshort﹣nomorethan15minutesatfirst.Thiswillstopyourbrainandbodyfromfallingintothedeeperlevelsofsleepthatleaveyoufeelingfoggyuponwakingsheadds. Butifyou'rejustnotabornnapperdon'tsweatit.Everyone'sdifferentMednicksays.Ifyoufeelgoodwhateveryou'redoingisfine. 1ResearchersMednickandYueLengboththinkthatnappingcan. A.mirrorhealthproblems B.increaseworkefficiency C.causehigherdeathrates D.improvehealthconditions 2Whatdoestheauthorthinkofpeople'sblamingnapsforhigherdeathrates? A.Impolite. B.Necessary. C.Improper. D.Acceptable. 3TheunderlinedphrasecashinoninParagraph6probablymeans. A.applyfor B.takeadvantageof C.standfor D.taketheplaceof 4AccordingtoMednickthosewhoarenotbornnappersshould. A.takeiteasy B.shortensleeptime C.giveitatry D.improvesleepquality
SirJamesPaulMcCartneyisanEnglishsingersongwritermulti﹣instrumentalistandcomposer作曲家.HegainedworldwidefameasthebassguitaristandsingerfortherockbandtheBeatles.Howeverit'snotjustthewordsandmusicofhissongsthatPaulusestoexpresshisfeelingsaboutthingsthatarereallyimportanttohimbuthehasalsocloselytakenpartingettingtogetheranexcitingbookforchildren. Hehasbeenworkingwithillustrator插画师GeoffDunbarandwriterPhilipArdaghtofindawaytoputwordsandpicturesintoastoryaboutanimalprotection.Theresultisastorywithanimportantmessagecontainedinabeautifulbook.Geoffdreweveryoneofthebook's84illustrationsandPhilipmadePaulandGeoff'sideascometogetherinaveryentertainingwaythatallchildrenwillenjoyreading. ThreeluckyreadersofTheNewspaperTodaywonthechancetointerviewPaulaboutHighintheClouds. OnedayinPaul'sofficeAlexMylesandJessicawastednotimeinaskingPaulGeoffandPhiliphowtheideaforthestorycameabout.Paulexplainedthathehadbeeninterestedinanimalrightsforaslongashecouldremember.SeeingtheWaltDisneyfilmofBambiwhosemotherisshotbyhuntershadabigeffectonhimasachildandmadehimthinkthathuntingwasn'tcool. Paulsaidtheydidn'twanttotellpeoplewhattodointhebook.Theyjustwantedtogetacrosstheimportanceaboutanimalprotection. 1HowdoesPaulexpresshisfeelingapartfromthewordsandmusicofhissongs? A.Bydoingwhathecantoinspirepeople. B.Bywritingabookaboutchildren. C.Byillustratinganexcitingbookaboutanimals. D.Byjoiningingettingtogetherachildren'sbook. 2Whowrotethewordsofthebookaccordingtothesecondparagraph? A.GeoffDunbar B.PhilipArdagh C.PaulMcCartney D.MylesandJessica 3WhatisHighintheClouds? A.OneofPaul'snewsongs. B.TheplacewherePaulworks. C.Abookaboutanimalprotection. D.AnarticleinTheNewspaperToday. 4Whatdoestheunderlinedphrasegetacrossprobablymean? A.make…clear. B.realize. C.ignore. D.payattentionto.
Tocommunicatewithforeignersitisimportanttoknowtheirsocialcustoms1.Oryoumayhurtthefeelingsoftheotherpartywithoutactuallyintendingtodoso.Herearesomegeneraltips. 2don'thesitatetoask.SomeJapaneseseemtofeelthatitisimpolitetoaskbackevenwhentheydon'tquiteunderstand.Howeverit'smuchbettertosaythatyoudon'tunderstandthantopretendyouunderstandandanswerveryunclearly.Whenyoudon'tunderstandyoumaysayI'mafraidIdon'tunderstandyou.Wouldyoumindsayingitagain? •Alwaysanswerwhenyouareaskedaquestion.Westernersconsideritveryrudeifaquestionisnotanswered.Theythinkitisrudetoignoreaquestion3.SomanyJapaneseonlylaughnervouslywithoutsayinganythingwhentheyarespokento.ThiscomesfromembarrassmentbutnothingismoreunpleasantforWesterners. •Speakoutwhatyouthink.Westernersexpresstheiropinionsfreely4.Theydon'tmindhearingviewsthatdifferfromtheirown.Youmayexpressfranklywhatyouthinkorfeelofcoursebutyoumustn'tberudeinyourmannerofspeech. 5.TheEnglishuseofYesandNoisthesameasinJapaneseinaffirmative肯定的questionsbutinnegativequestionstheuseisopposite.InordinaryEnglishconversationsitisusualtoaddsomethingafterthemlikeYesbyallmeans.NoIreallydon't.MayIseeit? A.Don'tanswertoosimply B.Ifyoudon't'understand C.ItisthesamewiththeJapanese D.Besuretogiveyourdifferentopinions E.ItissurprisingtofindJapanesearedifferent F.Thisisespeciallytruewhencarryingonaconversation G.Theyfeelitisnaturalforpeopletohavedifferentideas
医学研究发现神经退行性疾病与神经元中形成的R﹣loop结构有关.R﹣loop结构是一种三链RNA﹣DNA杂合片段由于新产生的mRNA与DNA模板链形成了稳定的杂合链.导致该片段中DNA模板链的互补链只能以单链状态存在.下列叙述正确的是
在过去四十年中国发生了巨大的变化我们对此感到无比自豪.takeplace'介词+关系代词'定语从句
InJanuary2010apolicemanMichaelMalarsiewasondutyinAfghanistanwithothermemberswhenoneofthemsteppedonanIntelligentElectronicDeviceIEDburiedintheground.Itexplodedhittinghimintheface. TwoweekslaterhewokeupatWalterReedArmyMedicalCenter.MalarsierecalledhisfatherpushinghiminawheelchairtospeakwithadoctorwhotoldhimI'msorrywetriedbutthere'snothingwecando.You'regoingtobetotallyblind. TheexplosiondestroyedhiseyesightbutMalarsiewhowas22atthetimerealizedhowluckyhewastobealive.Theexplosionchangedmywholelife.Iwasn'tgoingtoletblindnessslowmedownhesaid. OneofthefirstthingsIthoughtofwasaguidedogMalarsiesaidsoheappliedforonewithFidelcoacharitableorganizationinConnecticutandaleadingprovideroftrainedguidedogs.Butoneofthosefour﹣leggedhelperscostabout﹩45000﹣notexactlyanaffordablepriceforanAirForceveteran老兵withafamily.・That'swhereNewman'sOwncamein﹣providingsomemoneythathelpedconnectMalarsiewithhisguidedog. OneyearlateraftertheexplosionMalarsiegotXxonayoungGermanshepherd.XxonhasgivenmebackthefreedomindependenceandconfidencetodowhatIneedtobeabletodohesaid.IthinkwhenyouhearaboutwhatNewman'sOwndoesonabroadrange范围it'shardtounderstandtheinfluencethatithas.・It'sonethingtohearadollaramountbutit'sawholeotherthingwhenyouhearthestoryofsomeonewho'spersonallybeenaffected.MylifehaschangedforeverMalarsieadded. Forover30yearsNewman'sOwnhashelpedsupportthousandsofcharitablecausesandorganizationswithclosetohalfabilliondollarsbeingdonatedsinceitsfoundingin1982.EverytimeyoubuyaNewman'sOwnproductyoustartajourneytowardimprovingsomeone'slife﹣someonelikeMichaelMalarsie. 1WhydidMichaelMalarsiebecomeblind? A.HesetoffanIEDbyaccident. B.Anexplosionhithimintheface. C.AfellowblewupanIEDonpurpose. D.Thedoctorsdidn'ttreathimproperly. 2HowdidNewman'sOwnhelpMichaelMalarsie? A.Byteachinghimbasiclifeskills. B.Bytrainingaguidedogforhim C.Byencouraginghimtobeconfident. D.Byofferinghimsomefinancialhelp. 3WhatcanweinferaboutNewman'sOwnaccordingtoParagraph5? A.Ithasmanyinterestingstories B.Itsinfluenceremainstobeseen C.Itmeansmuchtothoseinneed D.Itsactionisdifficulttounderstand.
XiaoLiacollegestudentbornafter1995usedtowashherhaireverytwodays.Butastheweatherhasgotcoldershehasbecomelazier.Shehasboughtamistspray喷雾器whichallowshertowashherhairlessoften.IwouldalsoliketohaveaproductthatcouldsavemethetroubleofputtingonmakeupshetoldOrientTodayapublicationaffiliatedtoHenanTelevision. SheisnottheonlyyoungChinesewhospendsmoneybecausesheslazy.AccordingtoareportissuedbyChina'se﹣commerceplatformTaobaoonChina'slazyeconomyChinesepeoplespent16billionyuanonproductsandservicesonlinein2018. Theso﹣calledlazyeconomyreferstoanewtypeofconsumptionofproductsandserviceswhicharedesignedtosavetimeandlabor.Accordingtothereportmanypeopleofthepost﹣1995generationbuyhigh﹣techelectronicdevicessuchasfloormoppingrobotsandautomaticwindowcleanerswhichsavethetroubleofdoinghouseholdchores.Meanwhiletake﹣outfooddeliveryservicesarealsopopularamongpeoplebomafter1995. Youngpeoplearewillingtospendmoneyonsuchproductsbecausetheywanttoenjoyhard﹣earnedleisure休闲timeafterabusyandstressfuldayatworkorschoolreportedGlobalTimes.Becausetheyneedtofocusontheirstudiesorjobstheseso﹣calledlazypeopletendtousetheirleisuretimemoreefficiently. Whilethelazyeconomymightbeconvenientforyoungpeopleitmightalsocreateproblems.The'lazyeconomy'oncampusisexpressedinthingslikepeoplebuyingfoodorotherthingswithoutleavingthedormitory宿舍.AsaresulttheystayintheirdormitoriesalldaylongplayingoncomputersandsmartphonesateachersumamedWenfromBeijingJiaotongUniversitytoldChinaNews. AccordingtoJinanDailythissituationcouldleadtoyoungpeoplebecominglesssociableandevendevelopingproblemsofcommunicatingwithothers.Youngpeopleshouldbecautiousaboutit. The'lazyeconomy'isachoiceoflifestyle.WhilethelazyeconomysavestimeandlaborthesavedtimeshouldbeusedtodovaluablethingscommentedOrientToday. 1XiaoLiismentionedto. A.introducealazygirltoreader B.explainhowyounggirlslivenowadays C.leadtothetopicofthetext D.tellusthegenerationbecomemoreandmorelazy 2What'slazyeconomy? A.Anewtypeofconsumptioncreatedbypost﹣1995generation. B.Apatternofconsumptioninwhichpeoplesavetimeandlabor. C.Anewtypeofsocietyinwhichpeoplebecomemoreandmorelazy. D.Apatternofconsumptionisdesignforthepost﹣1995generation. 3Whyyoungpeoplelikeonlineshoppingaccordingtothepassage? A.Becausethegoodsonlinearecheaper. B.Becausetherearevarietiesofgoodsonline. C.Becauseyoungpeoplewanttomakethebestofleisure休闲time. D.Becauseyoungpeoplearelazier. 4Whichisthedisadvantageoflazyeconomyaccordingtothepassage? A.Makingyoungpeoplelazy. B.Buyingunhealthyfoodonline. C.Wastingmoney. D.Makingyoungpeoplelesssociable.
Batsaretheonlymammalsthatcanflyagreatdistancebuttheyhaveanotherability.Manybatsliveaverylongtimeforananimaltheirsize. Europeanresearchersarestudyingbatstounderstandwhytheylivesolong.Theyhopetomakediscoveriesaimedatfightingtheagingprocessinhumanbeings.Lastweekthegroupofscientistssaidtheyhadidentifiedimportantbiologicalqualitiesinsomebatspecies. Thegroupstudiedbatchromosomes染色体alineofgenesfoundinthenucleusofcells.Thescientistsweremostinterestedinstructuresconnectedtotheendsofthechromosomes.Theyarecalledtelomeres.Telomeresprotecttheendsofchromosomeswhichshorteneachtimeacelldivides.Scientistsbelievethisshorteningprocesscausescellstobreakdown.Theysaythisiswhatcausesaging. TheEuropeanresearchersstudied493batsfromfourbatspecies.Thegroupusedinformationthathadbeengatheredovermorethan60years.Oftheseanimalsthegreatermouse﹣earedbatgenerallylivedthelongestanaverageof37years.ThescientistssaidthisandarelatedspecieswhicharegroupedtogetherunderthenameMyotishadtelomeresthatdidnotshortenwithage. Thescientists'findingssuggestthatthesebats'cellshavetheabilitytomaintainandrepairtheirtelomeres.Thistheysaidhelpsguardagainsttheagingprocess. Basedonitsbodysizeabatlikethegreatermouse﹣earedbatwouldbeexpectedtolivefouryears.Butthesemammalshavebeenfoundtolivenearly10timeslongerthanthat. 1Whichthefollowingstatementisrightaccordingtothetext? A.Batslivethelongesttimeamonganimals. B.Europeanresearcherswanttofighttheagingprocessinhumanbeing. C.Fromtheinformationscientistsfoundthegreatermouse﹣earedbatlivedthelongestlifeinallspecials. D.Scientistshavedevelopedwaystofightagingbystudyingbats. 2Accordingtothescientiststelomeresare? A.structureswhichprotecttheendsofchromosomes. B.geneswhichcanbefoundinthenucleusofcells. C.chromosomeswhichcanshorteneachtimeacelldivides. D.agingprocesses. 3AccordingtothetextMyotishadthelongestlifeamongbatsspeciesbecause? A.theyhadtelomeresthatkeepageprocessing. B.theircellscanmaintainandrepairtheirtelomeres. C.theirchromosomesweremorethanothers. D.theirtelomerescausecellstobreakdown
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. DearTerry Howareyoudoing?Inyourlastletteryouaskedmeforpart﹣timeworkinyoursummerholiday.NowIamwritingtotellyoumyopinions. Tobeginwithyoucanmakesomepocketmoneythathelpsdevelopasenseofindependent.Besidesyoucanlearnwhattodealwithvariousproblemsintheworkplace.What'smoreyoucanbuildnewfriendshipandimprovedbettersocialskills. Butasamiddleschoolstudentlearnisveryimportantforyou.Youshouldmakefulltheuseoftheholidaytostudy.Myadviceisthis:makeadetailedplanforyourstudybutworkandmanagethingsproper. Wishyouapleasantsummer. Yours LiHua
假定你是李华.你从互联网上得知第十二届国际未来商业领袖峰会InternationalFutureBusinessLeaderSummit将在上海举行并欢迎中学生参加.请你写一封电子邮件申请参加.要点如下: 1.自我介绍包括英语能力; 2.申请参加活动的意图增长商业知识提高领导力加强交流; 3.希望获准. 注意:1.词数80左右; 2.可适当加入细节使内容充实行文连贯.
ARaceAgainstDeath ItwasacoldJanuaryin1925inNomeAlaska.Thetownwascutofffromtherestoftheworldduetoheavysnow. Onthe20thofthatmonthDr.Welch1asickboyBillyandknewhehaddiphtheriaadeadlyinfectious传染的diseasemainlyaffectingchildren.ThechildrenofNomewouldbe2ifitstruckthetown.Dr.Welchneededmedicineassoonaspossibletostopotherkidsfromgettingsick.3theclosestsupplywasover1000milesawayinAnchorage. HowcouldthemedicinegettoNome?Thetown's4wasalreadyfulloficesoitcouldn'tcomebyship.Carsandhorsescouldn'ttravelonthe5roads.Jetairplanesandbigtrucksdidn'texistyet. 6January26Billyandthreeotherchildrenhaddied.Twentymorewere7.Nome'stownofficialscameupwithan8.Theywouldhavethemedicinesentby9fromAnchoragetoNenana.Fromtheredogsled狗拉雪橇drivers﹣knownasmushers﹣would10ittoNomeinarelay接力. TheracebeganonJanuary27.ThefirstmusherShannonpickedupthemedicinefromthetrainatNenanaandrodeallnight.11hehandedthemedicinetothenextmusherShannon'sfacewasblackfromtheextremecold. OnJanuary31amushernamedSeppalahadto12afrozenbodyofwatercalledNortonSound.Itwasthemost13partofthejourney.NortonSoundwascoveredwithicewhichcouldsometimesbreakupwithoutwarning.IfthathappenedSeppalamightfallintotheicywaterbelow.Hewould14andsowouldthesickchildrenofNome.ButSeppalamadeitacross. AhugesnowstormhitonFebruary1.AmushernamedKaasenhadtobravethisstorm.Atonepointhugepilesofsnowblockedhis15.Hehadtoleavethetrail雪橇痕迹togetaroundthem.Conditionsweresobadthatitwasimpossibleforhimto16thetrailagain.TheonlyhopewasBaltoKaasen'sleaddog.Baltoputhisnosetotheground17tofindthesmellofotherdogsthathadtraveledonthetrail.IfBaltofaileditwouldmeandisasterforNome.Theminutespassedby.SuddenlyBaltobeganto18.Hehadfoundthetrail. At5:30amonFebruary2Kaasenandhisdog19inNome.WithinminutesDr.Welchhadthemedicine.Hequicklygaveittothesickchildren.Allofthemrecovered. Nomehadbeen20. 1A.examined B.warned C.interviewed D.cured 2A.harmless B.helpless C.fearless D.careless 3A.Moreover B.Therefore C.Otherwise D.However 4A.airport B.station C.harbor D.border 5A.narrow B.snowy C.busy D.dirty 6A.From B.On C.By D.After 7A.tired B.upset C.pale D.sick 8A.plan B.excuse C.message D.topic 9A.air B.rail C.sea D.road 10A.carry B.return C.mail D.give 11A.Though B.Since C.When D.If 12A.enter B.move C.visit D.cross 13A.shameful B.boring C.dangerous D.foolish 14A.escape B.bleed C.swim D.die 15A.memory B.exit C.way D.destination 16A.find B.fix C.pass D.change 17A.pretending B.trying C.asking D.learning 18A.run B.leave C.bite D.play 19A.gathered B.stayed C.camped D.arrived 20A.controlled B.saved C.founded D.developed
假如你是李华今年暑假你将去英国CliftonSchool学习一个月并将寄宿在英国学生Jack家中.写一封电子邮件向他介绍自己并询问几个问题1.住宿方式2.能否上网3.饮食方式4.到校的交通 注意:1.词数100左右可适当增加内容2.开头和结尾已给出不计入总词数 DearJack IamLiHuaahighschoolstudentfromChina.……… Yours LiHua
下列关于激素抗体酶和神经递质的叙述正确的是
TwoyearsagoattheBritishAcademyofFilmandTelevisionArtsteapartyinLosAngelesMillieBobbyBrownwasacharmingdarling.WhenevershemetsomeoneshewouldextendherhandandsayHi!I'mMillieBobbyBrown.Sogladtomeetyou! BestknownforstarringasElevenayounggirlwithpsychokineticabilitiesinthehitsci﹣fiTVseriesStrangerThingsBrownisaniconforhergenerationasWmagazineputit. ToplayElevenBrownhadtocutoffherlonghairandshaveherheadwhichissomethingthatwouldbequitedifficultforanyteenager.ButtheBritishactressdiditwithoutasecondthought.Thisisperhapswhatsetsherapartfromfellowchildstars.Ontheonehanditwascool.Whenyou'rebaldrainfeelslikeaheadmassage.I'dwalkintherainandpeoplewouldlookatmelikeIwascrazyshetoldWButontheotherhandpeoplestaredatmewonderingwhetherIwassick.SomewouldevenlaughatmewithoutknowingwhetherIwasorwasn'tsick. ThesepeoplecertainlyhurtBrownesfeelingsbuttheyalsotaughthersomethingaboutcompassion.IntheendbeingbaldwasthebestthingIeverdid﹣beingdifferentchangedmylife.Iwantedtoembracemybaldnessandhopefullyinspirepeopleshesaid. HerbraverywonherthehonoroftheyoungestUNICEFGoodwillAmbassadorlastmonth. It'sahugehonortobecomeUNICEF'snewestandyoungesteverGoodwillAmbassadorthe14﹣year﹣oldwhohassupportedthechildren'scharitysince2016wroteonsocialmediaplatformInstagram.IamlookingforwardtomeetingasmanychildrenandyoungpeopleasIcanhearingtheirstoriesandspeakingoutontheirbehalf. ChildrenaretheirownbestadvocatesHenriettaForeUNICEF'sexecutivedirectorsaidinanannouncement.IknowthatMilliewilluseherpassiontodefendtherightsofvulnerablechildrenandyoungpeopleeverywhere. 1FromthepassageweknowthatMillieis. A.conservative B.aggressive C.outgoing D.energetic 2WhatdidMilliedotoplaywellinStrangerThings? A.Shetiedupherlonghair. B.Shemadeherheadbald. C.Shelearnedfromotherfellowstars. D.Sheshavedherbody. 3WhichstatementisTRUEaccordingthepassage? A.Milliewasgreatlyencouragedbyothers. B.Milliedidn'tregrettedbeingshaved. C.Milliewasinspiredbyallkindsofcomments. D.Milliewasdiscouragedbymisunderstanding. 4What'sHenriettaFore'sopinionaccordingtothepassage? A.Millieissuretohelpthevulnerablechildrenaroundtheworld. B.ChildrenareMollie'sbestadvocates. C.Milliewilldoherbesttodefendagainstvulnerablechildren. D.Therearesomanyvulnerablechildrenandyoungpeopleintheworld.
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