首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
氯化亚铜是化工和印染等行业的重要原料，广泛用作有机合成的催化剂． Ⅰ．甲采用CuCl2•2H2O热分解法制备CuCl，装置如图． （1）仪器X的名称是 ，C中烧杯的试剂可以是 ． （...
查看本题答案
包含此试题的试卷
高三下学期化学《》真题及答案
点击查看
你可能感兴趣的试题
芳香烃用途很广可作为炸药染料医药合成橡胶等重要的化工原料
苯是一种重要的有机化工原料广泛用于合成橡胶塑料和医药等方面下列关于苯的叙述正确的是
分子式为C
6
H
6
属于不饱和烃
能在空气中燃烧
无色无毒的液体
石油是重要的能源和化工原料1写出由石油加工得到的可以用作燃料的一种产品________它在燃烧时往往
氯化铜氯化亚铜是重要的化工原料广泛用作有机合催化剂.已知氯化铜容易潮解.实验室用如图所示装置用还原铜
氯化亚铜CuCl广泛用于化工印染有机合成等行业.CuCl难溶于醇和水可溶于氯离子浓度较大的体系在潮湿
酚类是等化工产品的重要原料
塑料
合成纤维
医药
染料
石油产品中的石油化工产品是有机合成工业的重要基本原料或中间体有的可以直接使用
在三烯三苯乙炔萘的基础上通过各种合成步骤制得醇醛酮酸酯醚酚腈卤代烃等有机原料的生产过程称为
石油炼制过程
基本有机化工生产过程
有机化工生产过程
高分子化工生产过程
下列关于常见有机物的用途说法中不正确的是
乙烯可作催熟剂，其产量通常是衡量一个国家石油化工发展水平的标志
氯乙烯可用来制PVC塑料，PVC塑料可用作食品包装袋
卤代烃广泛应用于化工、药物生产及日常生活中，许多有机化合物都需要通过卤代烃去合成
苯有毒、有腐蚀性，不能用作提取食用油的有机溶剂
磺化反应在现代化工领域中占有重要地位是合成多种有机产品的重要步骤在洗涤剂及石油等行业中应用较广
医药、
农药、
燃料、
卫生
氢氧化钠是一种重要的化工基础原料广泛地应用于造纸纺织石油化工印染等行业氢氧化钠的俗名是只写一种氢氧化
列不属于石化工业的是
石油炼制
以天然气、轻汽油、重油为原料合成氨、尿素
乙烯、丙烯等基本化工原料合成有机化工原料
以有机化工原料加工制得其他化工产品
芳香烃用途很广可作为炸药染料医药合成橡胶等是重要的化工原料
下列关于有机物的用途说法不正确的是
甲烷是一种热量高的能源
聚氯乙烯塑料可用于食品包装袋
乙醇是一种很好的溶剂，能溶解多种有机物和无机物
苯是重要的有机化工原料之一，广泛用作溶剂。
下面关于乙炔的说法不正确的是
乙炔能发生聚合反应
乙炔聚合后，一般生成高聚物
乙炔是一种重要的有机合成原料
乙炔可用作高温氧炔焰的燃料
异戊二烯是重要的有机化工原料其结构简式为CH2=CCH3CH=CH2 完成下列填空 设
石油化工产品是工业的重要基本原料和中间体
炼油
有机合成
无机合成
膜分离
苯的氨基和硝基化合物中毒被广泛用于有机合成染料制造以及化工农药等工业
炼铁、炼钢
炼焦
橡胶、炸药
油漆、印刷
制药、印染
煤石油天然气是人类使用的主要能源同时也是重要的化工原料下列不属于以煤石油和天然气为主要原料生产的合成
塑料
合成橡胶
淀粉
合成纤维
乙炔是有机合成的重要原料之一也是合成橡胶合成纤维和塑料的单体
热门试题
更多
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:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. SinceIwasakidI'veconsidereddifferentjobIwouldliketodo.FirstIwantedtobeafiremanwhoseuniformlookedsocoolly.ThenwhenIwasinthefivegradeIwantedtobeateacherbecauseIlikedmyEnglishteachertoomuch.WhenIstudiedchemistryhighschoolIreconsideredmggoalordecidedtobeadoctor.Theyweretworeasonsforthedecision.OnewasthatIwasamazingatthefactthatasickpersoncouldfeelmuchmorebetterafterseeingadoctor.AndtheotheristhatIwantedtohelppeopleinneed.
Chineseresearchershave1soccessfulgrownandharvestedriceinthedesertofDubai迪拜afterdevelopingastrain品种which2allowthecroptogrowinsaltwater. Ateamofscientists3leadbyChina'sFatherofHybridRice.YuanLongpinghavealreadystartedgrowingthecropinthediluted稀释的seawaterathomeandarenowbringingthetechniquetotheMiddleEast. ThebigharvestofricelastyearinthesuburbsofDubaifarexceededscientists'expectationsaccordingtoareportbyXinhuaNewsAgency.Thehighoutput7500kilogramsperhectare公顷comparedwiththe4globeaverageof3000kilogramsperhectare﹣hasencouragedscientiststoexpandtheprject.They5plantosetupa100﹣hectareexperimentalfarminDubailaterlastyear.Theywillputitintoregularusethisyearandthenstartexpandingafter2020. TheDubaiprojectisacommperationbetweenChina'sSeaRiceResearchandDevelopmentcenterwiththeprivateOfficeofSheikhSaeedBinAhmedAlMaktoum.Thetwopartieshavesignedan6agreetopromoteseawaterariceacrosstheArabworldtoreducetheriskoffoodshortagesinthefuture. Whilescientistsinsomecountries7watershortagesareaseriousconcernhavebeendevelpingdesalination脱盐techniquestochangeseawaterforuseinagricultureChinahasbeenworking8developstainsofsaltresistantricefrothepastfourdecades. Although9isnotyetclearhwotheDubaiprojectwillbeabletosecureenoughfreshwatertodiluteseawater10lare﹣scalericeplantingChinesescientistshavealreadystartedgrowingitclosertohomeonacommercialscale.
已知则＝．
假定你是李华你的英国笔友Robert最近给你发了一封内容如下的电子邮件请你根据邮件内容和写作要点用英语给他回复 DearLiHua I'mreadyupsetatpresentIhadmanyfriendsbutnownoneofthemwanttotalktome.atlunchtimenobodylikestoshareatablewithme.Ifeelreallypuzzledandlonely.AndIcan'tunderstandwhytheyaretryingtoavoidme.Wouldyoupleasegivemesomeadvice?Thankyou. Robert 写作要点:1.给他的处境表示理解2.给他提出合理的建议3.愿意为他继续提供帮助 注意:词数100左右可以适当增加细节以使得行为连贯开头和结尾已经为你写好不计入总词数量 DearRobert
IsFreshAirReallyGoodforYou? Weallgrewuphearingpeopletellustogooutandgetsomefreshair.1AccordingtorecentstudiestheanswerisabigYESiftheairqualityinyourcampingareaisgood. 2Iftheairyou'rebreathingisclean﹣whichitwouldbeifyou'reawayfromthesmogofcities﹣thentheairisfilledwithlife﹣givingenergizingoxygen.Ifyouexerciseoutofdoorsyourbodywilllearntobreathemoredeeplyallowingevenmoreoxygentogettoyourmuscles肌肉andyourbrain. Recentlypeoplehavebegunstudyingtheconnectionbetweenthenaturalworldandhealing治愈.3Intheseplacespatientscangotobenearnatureduringtheirrecovery.Itturnsoutthatjustlookingatgreengrowingthingscanreducestresslowerbloodpressureandputpeopleintoabettermood情绪.Greeneryisgoodforus.HospitalpatientsWhoseetreebranchesouttheirwindowarelikelytorecoveratafasterratethanpatientswhoseebuildingsorskyinstead.4Itgivesusagreatfeelingofpeace. 5Whilethesun'srayscanageandharmourskintheyalsogiveisbeneficialVitaminD.TomakesureyougetenoughVitaminD﹣butstillprotectyourskin﹣putonsunscreenrightasyouheadoutside.Ittakessunscreenaboutfifteenminutestostartworkingandthat'splentyoftimeforyourskintoabsorbaday'sworthofVitaminD. A.Freshaircleansourlungs. B.Sowhatareyouwaitingfor? C.Beinginnaturerefreshesus. D.Anothersidebenefitofgettingfreshairissunlight. E.Butisfreshairreallyasgoodforyouasyourmotheralwayssaid? F.Justasimportantlywetendtoassociateairwithhealthcare. G.AllacrossthecountryrecoverycentershavebegunbuildingHealingGardens.
设min{pqr}为表示pqr三者中较小的一个若函数fx＝min{x+1﹣2x+7x2﹣x+1}则不等式fx＞1的解集为
函数fx＝Asinωx+φA＞0ω＞0﹣π＜φ＜0的部分图象如图所示为了得到gx＝Acosωx的图象只需将函数y＝fx的图象
ThepolarbearisfoundintheArcticCircleandsomebiglandmassesasfarsouthasNewfoundland.Whiletheyarerarenorthof88°thereisevidence1theyrangeallthewayacrosstheArcticandasfarsouthasJamesBayinCanada.Itisdifficulttofigureoutaglobalpopulationofpolarbearsasmuchoftherangehasbeen2poorstudied;howeverbiologistscalculatethatthereareabout20000﹣25000polarbearsworldwide. Modernmethods3trackingpolarbearpopulationshavebeenemployedonlysincethemid﹣1980sandareexpensive4performconsistentlyoveralargearea.InrecentyearssomeInuitpeopleinNunayut5reportincreasesinbearsightingsaroundhumansettlementsleadingtoa6believethatpopulationsareincreasing.Scientistshaverespondedby7notethathungrybearsmaybecongregating聚集aroundhumansettlementsleadingtotheillusion错觉thatpopulationsare8highthantheyactuallyare.Of9nineteenrecognizedpolarbearsubpopulationsthreearedecliningsix10bestableoneisincreasingandninelackenoughdata.
NeedaJobThisSummer? Theprovincialgovernmentanditspartnersoffermanyprogramstohelpstudentsfindsummerjobs.Thedeadlinesandwhatyouneedtoapplydependontheprogram. Notastudent?Gotothegovernmentwebsitetolearnaboutprogramsandonlinetoolsavailabletohelppeopleunder30buildskillsfindajoborstartbusinessesallyearround. JobsforYouth Ifyouareateenagerlivingincertainpartsoftheprovinceyoucouldbeeligible符合条件forthisprogramWhichprovideseightweeksofpaidemploymentalongwithtraining. Whoiseligible:Youth15﹣18yearsoldinselectcommunities社区. SummerCompany SummerCompanyprovidesstudentswithhands﹣onbusinesstrainingandawardsofupto$3000tostartandruntheirownsummerbusinesses. Whoiseligible:Studentsaged15﹣29returningtoschoolinthefall. StewardshipYouthRangerProgram YoucouldapplytobeaStewardshipYouthRangerandworkonlocalnaturalresourcemanagementprojectsforeightweeksthissummer. Whoiseligible:Studentsaged16or17attimeofhirebutnotturning18beforeDecember31thisyear. SummerEmploymentOpportunities机会 ThroughtheSummerEmploymentOpportunitiesprogramstudentsarehiredeachyearinavarietyofsummerpositionsacrosstheProvincialPublicServiceitsrelatedagenciesandcommunitygroups. Whoiseligible:Studentsaged15orolder.Somepositionsrequirestudentstobe15to24orupto29forpersonswithadisability. 1WhatisspecialaboutSummerCompany? A.Itrequiresnotrainingbeforeemployment. B.Itprovidesawardsforrunningnewbusinesses. C.Itallowsonetoworkinthenaturalenvironment. D.Itoffersmoresummerjobopportunities. 2WhatistheagerangerequiredbyStewardshipYouthRangerProgram? A.15﹣18. B.15﹣24. C.15﹣29. D.16﹣17. 3Whichprogramfavorsthedisabled? A.JobsforYouth. B.SummerCompany. C.StewardshipYouthRangerProgram. D.SummerEmploymentOpportunities.
在直角坐标系xOy中曲线C1的参数方程为α为参数曲线C2的参数方程为β为参数以O为极点x轴的正半轴为极轴建立极坐标系． 1求曲线C1和曲线C2的极坐标方程 2已知射线l1θ＝α0＜α＜将射线l1顺时针旋转得到射线l2θ＝α﹣且射线l1与曲线C1交于OP两点射线l2与曲线C2交于OQ两点求|OP|•|OQ|的最大值．
AmonthagoIbrokeanail.Myothernailslookedamazingbutnowonewasamess.ClearlytherewasnopointinkeepingtheotherssoIlookoutthenailscissorstocutthemalloff. WhatareyoudoingMom?mydaughtercriedyournailslookgreat!Don'tcutthem! Butthey'reruinedIsaidwavingthebrokenoneinherface. They'renotruinedshesaid.youstillhaveninenailsleft! Ihesitatedwiththescissorsstillinmyhand.Mynailscertainlyweren'tperfectanymoreandtheoppositeofperfectisruinedright?ImeanthisishowIthinkaboutmostthings:it'sallornothing.Takemyfinancesforexample. Icanspendweeksbeingsensibleandbuyingonlyessentialitemssuchasfoodformyfamily.AndthenonedayI'llseesomethingexpensivethatIreallylikeandbuyit.ThenIthinktomyselfwellIalreadyspent100dollarsonthatdresslastweeksoImayaswellspend50dollarsonthislipstick口红andgiveupsavingentirelyI'vethoughtaboutwhyIactthiswaybutIdon'tknowwhatcausesthisbehavior.Iseemtogofromgoodtocompletedisasterinamatterofmoments.Mybrainonlyseesperfectordisasterwhichisextremelyunhelpful. Wehumansareneverjustgoodorbad﹣wearefarmorecomplex.Wehavewinsandwehavelossesandoccasionallytheyarehardtotellapart.Somepeopleunderstandthisinstinctively本能地whileothersstruggle.Formostofuslearningnottodothethingwe'reusedtorequireseffortanddiscomfort.Howeverweshouldremindourselvesthatwesometimesmakemistakesandthatthisdoesn'tmeanwe'vefailed.Weneedtoacceptthatthingswillsometimesgowrong. Indeedfailureispartoflife.Weallfalloccasionallyandwenormallygetstraightbackup.Andsowithmydaughter'swordsringinginmyearsIdecidedtokeepmyninenicenails.IfeelannoyedeverytimeIlookatmyhandsbutI‘mdeterminedtolivewithmychoice.It'saperfectexerciseinimperfection.MaybesoonI'llswitchoffmycomputerthenexttimeIfeellikeImightbuysomethingelseIdon'tneedalthoughImayneedmydaughtertheretoguidemeagain. 1Whydidtheauthorwanttocutoffhernails? A.Shegotallofthemruined. B.Shedidn'tlikelongnailsatall. C.Shedidn'twanttohaveimperfectnails D.Shewantedtopreventthembeingbroken. 2whatistheauthor'sproblemwithherlife? A.Sheisrathercrazyaboutshopping B.Shelooksatlifeinanextremeway C.Sheistoocarefulwithherfinances D.Sheisunwillingtochangehermind. 3Whatdoestheauthorthinkoffailure? A.Itisjustanormalpartoflife B.Itcanhelppeopletobestronger C.Itcancompletelydestroyourlife D.Itissomethingweneedtoovercome
已知等差数列{an}的前n项和为Sn公差为d． 1若d＝1且S5＝a1a9求数列{an}的通项公式 2若a1a3a4成等比数列求公比q．
Asdataandidentitytheftbecomesmoreandmorecommonthemarketisgrowingforbiometric生物测量technologies﹣likefingerprintscans﹣tokeepothersoutofprivatee﹣spaces.Atpresentthesetechnologiesarestillexpensivethough. ResearchersfromGeorgiaTechsaythattheyhavecomeupwithalow﹣costdevice装置thatgetsaroundthisproblem:asmartkeyboard.Thissmartkeyboardpreciselymeasuresthecadence节奏withwhichonetypesandthepressurefingersapplytoeachkey.Thekeyboardcouldofferastronglayerofsecuritybyanalyzingthingsliketheforceofauser'stypingandthetimebetweenkeypresses.Thesepatternsareuniquetoeachperson.Thusthekeyboardcandeterminepeople'sidentitiesandbyextensionwhethertheyshouldbegivenaccesstothecomputerit'sconnectedto﹣regardlessofwhethersomeonegetsthepasswordright. Italsodoesn'trequireanewtypeoftechnologythatpeoplearen'talreadyfamiliarwith.Everybodyusesakeyboardandeverybodytypesdifferently. Inastudydescribingthetechnologytheresearchershad100volunteerstypethewordtouchfourtimesusingthesmartkeyboard.Datacollectedfromthedevicecouldbeusedtorecognizedifferentparticipantsbasedonhowtheytypedwithverylowerrorrates.Theresearcherssaythatthekeyboardshouldbeprettystraightforwardtocommercializeandismostlymadeofinexpensiveplastic﹣likeparts.Theteamhopestomakeittomarketinthenearfuture. 1Whydotheresearchersdevelopthesmartkeyboard? A.Toreducepressureonkeys. B.Toimproveaccuracyintyping. C.Toreplacethepasswordsystem. D.Tocutthecostofe﹣spaceprotection. 2Whatmakestheinventionofthesmartkeyboardpossible? A.Computersaremucheasiertooperate. B.Fingerprintscanningtechniquesdevelopfast. C.Typingpatternsvaryfrompersontoperson. D.Datasecuritymeasuresareguaranteed. 3Whatdotheresearchersexpectofthesmartkeyboard? A.It'llbeenvironment﹣friendly. B.It'llreachconsumerssoon. C.It'llbemadeofplastics. D.It'llhelpspeeduptyping. 4Whereisthistextmostlikelyfrom? A.Adiary. B.Aguidebook. C.Anovel. D.Amagazine.
Ifyou'veeverhadadogyouknowjusthowdeepaconnectionyoucandevelopwithman'sbestfriend.Butadog'slifeismuchshorterthanhumansabout12to15yearslongwhichmeanseverydogownerhastogothroughtheheartbreakingmomentwhentheirlovingtheirlovingpetpassesaway. Whynotmakeacloneofthatdogthen?ThisisthesolutionofferedbyaSouthKoreacompanySooamBiotechResearchFoundation.Thecompanyhasalreadysuccessfullyclonedatleast400dogsmostlyforUScustomersevers9inceitpioneeredthetechniquein2005.NowsooamBiotechhasintroduceditsbusinesstoUKdogownersaswellofferingthemdogsthatlookjustliketheirlostones. Tocloneadogresearchersfirstneedtotakeaskincellfromalivingdogoronethathasjustdied.Meanwhileanotherdogisselectedtosupplyanegg.ResearchersthenreplacetheDNAintheeggwiththatfromskincellandimplanttheeggintothewomb子宫ofafemaledog.Theegggrowsintoapuppyoverthefollowingtwomonths. Thewholeprocesstakeslessthanadaybutitcomesatashockinglyhighprice﹣around63000dollars.Butifyoucan'tafforditnowyoucanalsosavethecellinalaboratoryandaccessitatalaterdate. Howevermagicalascloningmightsoundthereisnoguaranteethatthecloneddogwillbeaperfectcopyoftheoriginalone.JustlikeidenticaltwinsofhumantheysharetheexactlysameDNAbuttherewillstillbesmalldifferencesbetweenthem.thespotsonaDalmatian斑点狗clonewillbedifferentforexampleInsungHwangheadofSooamBiotechtoldTheGuardian. Dogownerswillalsohavetoacceptthefactthatpersonalityisnotclneable.ApartfromgenespersonalityisalsodeterminedbyupbringingandenvironmentwhicharebothranoomelementsthatcloningtechnologiessimplycannotovercomeProfessorTomKirkwoodatNewcastleUniversityUKtoldTheTelegraph. Perhapsbringingourdogsbackbycloningisnotthebestwaytorememberthemafterall.KirkwoodadogownerhimselfpointedoutAnimportantaspectofourrelationshipwiththemiscomingtotermswiththepainoflettinggo. 1WhatservicedoesSooamBiotechResearcherFoundationoffer? A.Makingcopiesofpetdogs. B.Givingpetdogsidenticaltwins C.Helpingdogsgivebirthtomorepuppies D.Helpingdogownerslovetheirdogsmore 2Whichorderiscorrectinthedogcloningprocess? a.Aneggistakenfromanotherdog b.askincellistakenfromthepetdog c.Theegggrowsintoapuppyintwomonths d.Theeggisplacedinthewombofafemaledog e.TheDNAintheeggisreplacedbytheDNAfromtheskincell. A.a﹣d﹣b﹣e﹣c B.a﹣e﹣b﹣d﹣c C.b﹣a﹣d﹣e﹣c D.b﹣a﹣c﹣d﹣c 3Whatcanwelearnaboutdogclonignfromthepassage? A.ithasnotbeenputintopracticeuntilrecently B.itisverypopularamongUSandUKpetowner C.itmightnotgivetheownersanexactlysamedog. D.itisveryexpensiveandusuallytakeshalfayeartocomplete. 4WhatdoesKirkwoodthinkofdogcloning? A.Hedisagreeswithit B.Hesupportsit C.Heiscouriousaboutit D.Hethinksitunbelievable
已知函数fx＝x﹣aexa∈R． 1若a＝2求函数fx在x＝0处的切线方程 2若y＝fx有两个零点x1x2且x1＜x2． ①求a的取值范围 ②证明x1+x2＞2．
如图已知四边形ABCD与四边形BDEF均为菱形FA＝FC且∠DAB＝∠DBF＝60° 1求证AC⊥平面BDEF 2求二面角A﹣FB﹣C的余弦值．
Bacteriaareanannoyingproblemforastronauts.Themicroorganisms微生物fromourbodiesgrowuncontrollablyonsurfacesoftheInternationalSpaceStationsoastronautsspendhourscleaningthemupeachweek.HowisNASAovercomingthisverytinybigproblem?It'sturningtoabunchofhighschoolkids.Butnotjustanykids.ItisdependingonNASAHUNCHhighschoolclassroomsliketheonescienceteachersGeneGordonandDonnaHimmelbergleadatFairportHighSchoolinFairportNewYork. HUNCHisdesignedtoconnecthighschoolclassroomswithNASAengineers.ForthepasttwoyearsGordon'sstudentshavebeenstudyingwaystokillbacteriainzerogravityandtheythinkthey'reclosetoasolution解决方案.Wedon'tgivethestudentsanybreaks.TheyhavetodoitjustlikeNASAengineerssaysFlorenceGoldaprojectmanager. TherearenotestsGordonsays.Thereisnogradedhomework.Therealmostarenogradesotherthan‘Areyouworkingtowardsyourgoal?'Basicallyit's‘I'vegottoproducethisproductandthenattheendoftheyearpresentittoNASA.'Engineerscomeandreallydoanin﹣personreviewand…it'snotaverynicethingattimes.It'sahardbusinessreviewofyourproduct. GordonsaystheHUNCHprogramhasanimpact影响oncollegeadmissionsandpracticallifeskills.ThesekidsaresoabsorbedintheirstudiesthatIjustsitback.Idon'tteach.Andthatannoyingbacteria?GordonsayshisstudentsareemailingdailywithNASAengineersabouttheproblemreadyingaworkablesolutiontotestinspace. 1WhatdoweknowaboutthebacteriaintheInternationalSpaceStation? A.Theyarehardtogetridof. B.Theyleadtoairpollution. C.Theyappearindifferentforms. D.Theydamagetheinstruments. 2WhatisthepurposeoftheHUNCHprogram? A.Tostrengthenteacher﹣studentrelationships. B.Tosharpenstudents'communicationskills. C.Toallowstudentstoexperiencezerogravity. D.Tolinkspacetechnologywithschooleducation. 3WhatdotheNASAengineersdoforthestudentsintheprogram? A.Checktheirproduct. B.Guideprojectdesigns. C.Adjustworkschedules. D.Gradetheirhomework. 4Whatisthebesttitleforthetext? A.NASA:TheHomeofAstronauts B.Space:TheFinalHomeworkFrontier C.Nature:AnOutdoorClassroom D.HUNCH:ACollegeAdmissionReform
已知函数fx的导函数图象如图所示若△ABC为锐角三角形则一定成立的是
It'sabout250milesfromthehillsofwest﹣centralIowatoEhlers'homeinMinnesota.DuringthelongtriphomefollowingaweekendofhuntingEhlers1aboutthesmalldoghehadseen2alongsidetheroad.Hehad3tocoax哄thedogtohimbutfrightenedithad4. BackhomeEhlerswastroubledbythat5dog.SofourdayslaterhecalledhisfriendGregandthetwodrove6.Afteralongandcareful7Gregsawacrossafieldthedogmoving8away.Ehlerseventuallysucceededincoaxingtheanimaltohim.Nervousnessandfearwerereplacedwith9.Itjuststartedlicking舔Ehlers'face. Alocalfarmertoldthemthedogsoundedlikeone10aslostinthelocalpaper.Theadhada11numberforatowninsouthernMichigan.Ehlers12thenumberofJeffandLisatotellthemhehad13theirdog. Jeffhad14inIowabeforeThanksgivingwithhisdogRosiebutthegunshotshadscaredthedogoff.Jeffsearched15forRosieinthenextfourdays. EhlersreturnedtoMinnesotaandthendrove100milestoMinneapolistoputRosieonaflighttoMichigan.It'sgoodtoknowthere'sstillsomeoneouttherewho16enoughtogotothatkindof17saysLisaofEhlers'rescue18. Ifiguredwhoeverlostthedogwasprobablyjustas19toitasIamtomydogssaysEhlers.IfithadbeenmydogI'dhopethatsomebodywouldbe20togothatextramile. 1A.read B.forgot C.thought D.heard 2A.fighting B.trembling C.eating D.sleeping 3A.tried B.agreed C.promised D.regretted 4A.calmeddow B.stoodup C.rolledover D.runoff 5A.injured B.stolen C.lost D.rescued 6A.home B.past C.back D.on 7A.preparation B.explanation C.test D.search 8A.cautiously B.casually C.skillfully D.angrily 9A.surprise B.joy C.hesitation D.anxiety 10A.predicted B.advertised C.believed D.recorded 11A.house B.phone C.street D.car 12A.called B.copied C.counted D.remembered 13A.fed B.adopted C.found D.cured 14A.hunted B.skied C.lived D.worked 15A.onpurpose B.ontime C.inturn D.invain 16A.cares B.sees C.suffers D.learns 17A.place B.trouble C.waste D.extreme 18A.service B.plan C.effort D.team 19A.equal B.allergic C.grateful D.close 20A.suitable B.proud C.wise D.willing
某学校举办科技节活动有甲乙丙丁四个团队参加“智能机器人”项目比赛该项目只设置一个一等奖在评奖揭晓前小张小王小李小赵四位同学对这四个参赛团队获奖结果预测如下 小张说“甲团队获得一等奖” 小王说“甲或乙团队获得一等奖” 小李说“丁团队获得一等奖” 小赵说“乙丙两个团队均未获得一等奖”． 若这四位同学中只有两位预测结果是对的则获得一等奖的团队是．
设fx＝|x+2|+|x﹣3|． 1求不等式fx≥6的解集 2若不等式fx＞m2﹣4m恒成立求实数m的取值范围．
已知等差数列{an}__差d≠0S7＝35且a2a5a11成等比数列． 1求数列{an}的通项公式 2若Tn为数列{}的前n项和且存在n∈N*使得Tn﹣λan+1≥0成立求实数λ的取值范围．
函数y＝e|lnx|﹣|x﹣1|的图象大致是
假定你是李华暑假在伦敦学习得知当地美术馆要举办中国画展.请写一封信申请做志愿者内容包括: 1.写信目的; 2.个人优势; 3.能做的事情. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯; 3.结束语已为你写好.
Youcanusemeasalastresort选择andifnobodyelsevolunteersthenIwilldoit.ThiswasanactualreplyfromaparentafterIputoutarequestforvolunteersformykids'lacrosse长曲棍球club. Iguessthatthere'sprobablysomedemandingworkscheduleorsocialanxietyaroundsteppinguptohelpforanunknownsport.Shemayjustneedalittlepersuading.SoItryagainandtugattheheartstrings.ImentionthesingleparentwithfourkidsrunningtheshowandItalkaboutthedadcoachingateamthathiskidsaren'tevenon…AtthispointtheunwillingparentspeaksupAlright.YesI'lldoit. I'msecretlyrelievedbecauseIknowthere'srealpowerinsharingvolunteerresponsibilitiesamongmany.Theunwillingparentorganizesthemealschedulesendsoutemailsandcollectsmoneyforend﹣of﹣seasongifts.Somewherealongthewaythesameparentendsupbecominganinvaluablememberoftheteam.Thecoachisabletofocusonthekidswhiletheotherparentsarerelievedtobeoffthehookforanotherseason.Handingoutslicedorangestobloodthirstykidscanbeasexcitingaswatchingyourownkidscoreagoal. Stillmostofusvolunteersbreatheasighofreliefwhentheseasoncomestoaclose.Thatreliefiscoupledwithadeepunderstandingofwhythesamepeoplekeepcomingbackformore:Connectingtothecommunity社区asyoufreelygiveyourtimemoneyskillsorservicesprovidesarealjoy.Volunteeringjustfeelssogood. InthatsenseI'mprettysurevolunteeringismoreofaselfishactthanI'dfreelyliketoadmit.HoweverifothersbenefitintheprocessandIgetsomerewardtoodoesitreallymatterwheremymotivationlies? 1Whatcanweinferabouttheparentfromherreplyinparagraph1? A.Sheknowslittleabouttheclub. B.Sheisn'tgoodatsports. C.Shejustdoesn'twanttovolunteer. D.She'sunabletomeetherschedule. 2Whatdoestheunderlinedphrasetugattheheartstringsinparagraph2mean? A.Encourageteamwork. B.Appealtofeelings. C.Promotegooddeeds. D.Provideadvice. 3Whatcanwelearnabouttheparentfromparagraph3? A.Shegetsinterestedinlacrosse. B.Sheisproudofherkids. C.She'llworkforanotherseason. D.Shebecomesagoodhelper. 4Whydoestheauthorlikedoingvolunteerwork? A.Itgivesherasenseofduty. B.Itmakesherveryhappy. C.Itenableshertoworkhard. D.Itbringshermaterialrewards.
人们常说的“幸福感指数”就是指某个人主观地评价他对自己目前生活状态的满意程度的指标常用区间[010]内的一个数来表示该数越接近10表示满意度越高．为了解某地区居民的幸福感情况随机对该地区的男女居民各500人进行了调查调查数据如表所示 1在图中绘出频率分布直方图说明将各个小矩形纵坐标注在相应小矩形边的最上面并估算该地区居民幸福感指数的平均值 2若居民幸福感指数不小于6则认为其幸福．为了进一步了解居民的幸福满意度调查组又在该地区随机抽取4对夫妻进行调查用X表示他们之中幸福夫妻夫妻二人都感到幸福的对数求X的分布列及期望以样本的频率作为总体的概率．
设函数fx＝﹣x2+6x﹣4lnx在点Px0fx0处的切线方程为ly＝gx若∀x∈0x0∪x0+∞都有＜0成立则x0的值为．
已知函数的两个极值点分别为x1x2且x1∈01x2∈1+∞记分别以mn为横纵坐标的点Pmn表示的平面区域为D若函数y＝logax+4a＞1的图象上存在区域D内的点则实数a的取值范围为
设条件p函数fx＝log3x2﹣2x在a+∞上单调递增条件q存在x∈R使得不等式|2x+1|+|2x﹣1|≤a成立则p是q的
Ifyou'reagamerwho'sconstantlygluedtoyourphoneitcouldbetimetoaskformedicalhelp. OnJune182018theWorldHealthOrganizationWHOofficiallylistedgainingdisorderasamentalhealthcondition1. Videogamingislikeanon﹣financialkindofgambiling赌博fromapsychologicalpoingtofviewMarkGriffithsaprofessorfromNottinghamTrentUniversityintheUKtoldtheAssociatedPressAP.Gamblersusemoneyasawayofkeepingscorewhilegamersusepoints. 2. peopleneedtounderstandthisdoesn'tmeaneverychildwhospendshoursintheirroomplayinggamesisanaddictotherwisedoctorsaregoingtobefloodedwithrequestsforhelpJoanHarveyaspokeswomanfortheBritishPaychologicalSocietytoldAP. 3Forexamplea21﹣year﹣oldChinesewomansurnamedWuinGuangdongrovincewentblindinoneeyeafterplayingthemobilegameKingofGloryforawholeday.OndayswhenIhavenoworkIusuallygetupat6ameatbreakfastandplayuntil4pmshetoldtheSouthChinaMorningPost.ThenI'lleatsomethinghaveanap小睡andplayuntil1am. Wuisn'talone.AccordingtoastudypublishedbyChinaYouthDailyaboutoneinfiveyoungChinesepeopeplayonlinevideogamesforatleastfourtofivehoursperday.4InApriltheMinistryofEducationissuedanoticeaskingChineseschoolsandparentstopreventstudentsfrombecomingaddictedtotheInternetandgame. Othercountrieshavealsotakenaction.5MeanwhileinJapansomemobilephoneshaveaspecialmodeforchildrenthatletstheirparentscontrolwhatgamestheycandownloadandhowlongtheycanplay. A.Thismeansit'snowonthesamelistasothermentalillnesses B.Thankfullymeansureshavebeentakentodealwiththeproblem. C.Weoftenseepeoplearoundusplayinggamesontheirmobilephones D.InSouthKoreachildrenareforbiddentoplayvideogamesaftermidnight. E.WHO'smainworkistoimprovethementalhealthofindividualsandsociety F.Butifyoulosecontroloveryourgaminghabitsyou'llfaceseriousproblems. D.Howeveritdoesn'tmatterifyouplayyourfavoritegamenowandthen.
热门题库
更多
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
国际法
教案备课库
教案备课库
教案备课库
教案备课库
湘公网安备 43130202000226号