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已知函数y=-2x-6.(1)当x=-4时,求y的值;当y=-2时,求x的值.(2)画出函数图象.(3)若y的取值范围-4<y<2,求x的取值范围.
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Astudentdoesnotknowanyoftheanswersonatest.Allthequestionsontheanswerpageareunfamiliartohimandwhentheresultscomebackthestudentrealizesthathehasfailed.1.Bycopyingtheworkofothershecanruinhisgradeaswellashisfuture. Mostpeoplehavecheatedatleastonceintheirliveswhetheritwasformissedorincompleteworkorevenjustforcredit分数thattheydidn'tdeserve.2.Itshowslessresponsibilityaswellaslessknowledge.Forexampleifastudentcheatsusingaclassmate'sexampaperheistakingcreditforanother'swork.Iftheteachercatcheshimtheconsequence后果isusuallyfailure. Cheatingbyusingtheworkofothersisthesameasruiningyourlifewithdrugs.Ifastudentcontinuescheatingthenitmaybecomeahabitinthefuture.3.Weallhavebrainsthatwecanuseandalsoourteachersandparentscanhelpus. 4.Inthebeginningwhenthestudentisinprimaryschoolcheatingmayonlyleadtolosingcredit.Inmiddleschooltherewillbeparent﹣teacherconferences.Butinhighschoolcollegeandtherestofaperson'slifecheatingwillnotbeignored. Ofallthingstakingcreditforotherpeople'sworkisnotonlyunnecessarybutquiteunreasonableaswell.Ifwealljustdoourworkthenthereisnoneedtocheat.5. A.Buttakingtheworkofothersandusingitasyourownisnottherightthingtodo. B.Theycanjusttelltheirparentsthetruth. C.Thisisthesituationforthosewhocopytheirhomeworkfromothers. D.Thereisnoneedtoruinbothyourhealthandyourmind. E.Besidesnooneneedstocheat. F.Peoplewhocheatusuallyhavetofacetheconsequences. G.Weshouldmakeaneffortduringoureducationinsteadoftakingtheeasywayout. 1. 2. 3. 4. 5.
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8分Myfirstchildwasbornin1986andtwoandahalfyearslaterIhadmydaughter.AllIeverdidfromthenonwastakingcareofkidsandourhome.ThroughoutthoseearlyyearswheneverIwentsomewhereandwasaroundotheradultsIwouldbeaskedwhatIdid.FartoomanypeoplehadthesamereactionwhenItoldthemIwasastayathomemom.ItmademeveryangryatsuchtypeofresponseasOhyoureallydon'tdoanything.IworkedhardasamomandItookmyjobveryseriously!Raisingchildrenisdoingsomethingandisextremelyimportant. Sothat'swhenIdecidedtofindawaytodealwiththeseignorantpeopleandtoboostmyselfesteem自尊atthesametime.Onmanyofthesocialoccasionssomeoftheprofessionalwomenwouldgivemetheirbusinesscardasiftoshowmethattheyactuallydidsomethingandhadsomeimportanttitle.Idecidedtogivemyselfaveryimpressiveimportantsoundingtitleandthenmakeupabusinesscardtohandout. IthoughtaboutwhatIactuallydidasamomoverthenextfewdays.ItookspecialcaretomakesureIwasgivingmychildrenthebestcareinstructionandinformationIpossiblycould.Itwasmyjobtoteachmykidshowtospeakhowtoeathowtodresshowtogetalongwithothersandsoon.Ispecializedintheacademic学业的socialandemotionaldevelopmentofhumanbeings﹣mykids!AfterreadingmybriefoverviewofmyownjobIcameupwithmynewimpressivetitleHumanDevelopmentSpecialist. AteveryopportunityIhandedoutmycard.99.99%ofthetimepeoplewereobviouslyimpressed!Itreallymademefeelbetter.MostpeoplemadeaguessatwhataHumanDevelopmentSpecialistisordoesandIjustletthemthinkwhatevertheywantedto. 1.Wecanlearnfromthefirstparagraphthatthewriter. A.hadagoodjobbeforeshehadchildren B.inheropinionlookingafterchildrenathomeisofgreatimportance. C.couldn'tfindasatisfyingjob D.didn'tknowhowtogetonwithotherwomen 2.Whatdidthewriterdotoimproveherselfesteem? A.Shemadeherselfabusinesscard. B.Shepretendedtohaveagoodjob. C.Shestartedabusinessathome. D.Shetoldothershowshewasignored. 3.Whatwasotherpeople'sreactiontothewriter'stitle? A.Mostofthemfeltproud. B.Mostofthemwereexcited. C.Mostofthemweredisappointed. D.Mostofthemwereimpressedandpuzzled. 4.Whatwouldbethebesttitleforthepassage? A.FamilyIsMoreImportantThanWork B.BeingaMomMeansGivingupManyThings C.BeingaFulltimeMomIsImportant D.PeopleHaveEqualRights
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LastyearmybrotherandIwenttoMiamiforavacation.Someofmyfriendswhohadbeentherebeforesaid1wasawonderfulholidaydestination.Beforewewentwehadplannedformonths.Whenthedaycamewewereready. Afterourplanelandedwewenttothehotel.Wehadmadeourreservation预定sixmonths2earlybutthemanatthefrontdesksaidtherehadbeenamistake.We3tellthatourroomshadn'tbeenreservedforthatweek4fortheweekafter.Ididn'tunderstand5thiswouldhappenandmycreditcardhadalreadybeencharged6thereservation.What'sworsethehotelhadbeenfullybooked.Whenwewerewonderingwhattodooutcamethemanager7wassurprisinglyhelpful.SheapologizedforthemistakeandgaveusaspareVIProomon8topfloor.Wehadneverstayedinsuchan9amazeroomandweweren'tchargedextra. ThenextdaymybrotherandIwenttothebeach10wewatchedsomepeopleplayvolleyball.Wegotalittlesunburntbutthedayhadbeensorelaxingthatwedidn'tmind. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
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I'vereadlotsofstoriesaboutfamilymemories.InthosestoriesI'vefound1ofsadnessandlonging.It'struethatsomuchinourdailylivesmakesus2allthetime.Wefindourselveswithlessandlesstimetosparewithour3andfriends.I'vehadthesame4myself. Iusedtohave5timeswithmygrandfatherwhenwelivedtogether.WhenIwasveryyoungIoftenenjoyedspendingtimeinhis6watchingtheflowersandwateringthefruittrees.ButasIgrewupI7becameselfish. OncewhenIwas16wewentshoppingtogether.Aswetookthewrongbusandendedupgetting8unabletofindourwaybackIcouldn'tstay9andshoutedrudelyinhisface.Iwasso10thatIwouldn'tsaysorryafterreturninghomethinkingIhaddonenothingwrong. NowI11howridiculous荒唐的Iwasatthetime!AndIalsorealizehow12itwaswhenIfinally13Iwaswrong!WhenItrulywantedtoexpressmy14mygrandfatherhadleftusforeverleavingmewithnomore15to16mymistake.Icouldn't17saytohimthethreewords﹣﹣Iamsorry. Wearebecomingbusierandbusieroutsidewithlessandlesstimeto18withourfamiliesathome.So19thebestuseofeverysecondyouhavewithyourlovedonesbecausetime20goingwaitingfornoone. 1.A.promise B.response C.feelings D.signal 2.A.crazy B.easy C.angry D.busy 3.A.classmates B.families C.colleagues D.employers 4.A.adventure B.experience C.exploration D.research 5.A.good B.hard C.sad D.bitter 6.A.kitchen B.garage C.garden D.house 7.A.frequently B.rarely C.finally D.gradually 8.A.confused B.lost C.hurt D.puzzled 9.A.awake B.calm C.firm D.happy 10.A.stubborn B.intelligent C.fierce D.doubted 11.A.judge B.imagine C.realize D.agree 12.A.early B.late C.nice D.guilty 13.A.admitted B.appreciated C.doubted D.inspected 14.A.concern B.worry C.opinion D.regret 15.A.confidence B.chance C.evidence D.attention 16.A.careabout B.apologizefor C.thinkof D.putaway 17.A.again B.often C.even D.still 18.A.spend B.save C.take D.kill 19.A.follow B.receive C.divide D.make
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设X为随机变量X~Bn若随机变量X的数学期望EX=2则PX=2等于
BestcomicbookshopsforNYCkids BLAM!POW!FestivaliscomingtotownJan.9and10atthe69thRegimentArmorywithsigningspanelsandmilesandmilesofcomicbooks.Ifyou'reafull﹣blowncomicsnerd书呆子yourselfatriptothecity'scoolestcomicbookstoreswillbeagoodchoiceasyoucountdowntothebigday. BulletproofComicsandGames Fanswillfindeverythingfromthekid﹣friendlyTinyTitansseriestothelatestissueofX﹣Men.Onweekendsfamiliescanevenjoinavideogametournamentallageswelcome. *2178NostrandAveBrooklyn ForbiddenPlanet Thisstorepacksplentyofinterstellar星际的actionStarWarsandStarTrekactionfiguresvehiclesandvariousothercollectibles收藏品competeforshelfspacewithcomicbooksandinsiderytradepaperbacks.Upstairsyoungreaderscanbrowsethroughthestore'sextensivemanga漫画andanime动漫selection. *840Broadwayat13thSt JimHanley'sUniverse Besidesthegalacticarray银河阵列ofcomicbookssuchcollectiblesasCaptainAmerica'sshieldandIronMan'shelmetattractbudding初露头角的superheroesandtheirparentstoo. *4W33rdStbetweenFifthandSixthAves SilverAgeComics NestledinacorneroftheDitmarsBoulevardsubwaystationthisstore'suniquecoollocationisextra﹣convenientforfamiliesonthemove.Plusitsentirecollectioniscataloguedonlinesoyou'llknowifthatrareissueofDoomPatrolisinstockbeforeyouheadout. *22﹣5531stStbetweenDitmarsBlvdand23rdAveAstoriaQueens MidtownComics WanttofindthebestSpider﹣Manbooktogetyourchilduptospeed?JustaskoneoftheknowledgeableblueT﹣shirtcladstaffers包层员工.Limited﹣timediscountsareavailableamongthemanEasterSundayspecial20percentoffeverything. 200W40thStbetweenSeventhandEighthAvesSeewebsitesforotherlocations. 1.Inwhichcomicbookshopcanyousavemoney? A.MidtownComics B.ForbiddenPlanet C.BulletproofComicsandGames D.JimHanley'sUniverse 2.Ifyou'reinterestedincollectiblesrelatedtoCaptainAmericayoumaygoto. A.840Broadwayat13thSt B.200W40thStbetweenSeventhandEighthAves C.2178NostrandAveBrooklyn D.4W33rdStbetweenFifthandSixthAves 3.WhatisthedifferencebetweenSilverAgeComicsandtheothercomicbookshops? A.Itissofamousforitscoollocationthatmanyfamiliesgotherebysubway. B.Itholdsactivitiesforfamiliestojoinavideogametournamentonweekends. C.Youcangetinformationaboutthebookyouwantonlinebeforegoingthere. D.YoucanfindotherlocationsofitontheInternetwithoutanydifficulty.
Imagineyourselfonaboatlookingoutatthehorizonandallyoucanseeisthewatermeetingtheskywithnolandinsightandyouaresailingstraightaheadtomeettheworld.JesseMartindoesnothavetoimagineheislivinginit. OnDec.71998at17yearsoldJessesetsailfromMelbourneAustraliaonhisboatattemptingtobecometheyoungestpersontosailaloneandnonstoparoundtheworld.HesailedsouthofNewZealandthroughtheSouthPacificaroundSouthAmericanorthontheAtlanticbacksouthpastAfricathroughtheIndianOceanandbacktoMelbourne.EvenasayoungchildJessehadbeenanadventurerwhotraveledalloverEuropeandAsiawithhisparents.BorninMunichGermanyin1981hemovedtoAustraliawithhisfamilywhenhewasonlytwoyearsold.TheymovedclosetoarainforestinCowBayabout3500kmsnorthofMelbournewheretheybuiltasmallhousewithnoelectricityorrunningwater.Jessegrewupatthebeachenjoyingtheoutdoorstoitsfullest.At14hesailedforthefirsttimewithhisfatherandbrotherBeau.Itwasafterthistripthathebegantodreamaboutsailingaroundtheworld. Jesse'sfamilyplayedanimportantrole.IwasmadetobelieveIcoulddoanythingalthoughtherewereothersthatwerenotsoencouragingorsupportivehesays.PeoplethatIlookeduptorespectedandtrustedtoldmeIcouldn't.ThankfullyItrustedmyself.Therewerepeoplethatsaidthattheboatcouldn'tbereadybythetimeIhadtoleave.Howeverthroughperseveranceandbeliefinhimselfhewasabletodowhatmanytoldhimwasimpossible. OnOct.311999morethan10monthsafterhesetsailJesseMartinwentdowninhistoryastheyoungestpersontosailaroundtheworldalonenonstopandunassisted. 1.Byencouragingreaderstoimagineasailingexperiencetheauthorwantsto. A.showhowdifficultitistobeasailor B.describewhatJesse'ssailingislike C.showhowwonderfulJesse'slifeis D.describewhatasailor'slifeislike 2.Whatcanyouknowfromparagraph2? A.Jessewasthefirstpersonwhohadsailedalonearoundtheworld. B.JessetraveledalloverEuropeandAsiawithhisparentswhenhewas17. C.JessewasborninMelbourneandgrewupatthebeach. D.Jessegrewupinasmallhousewithnoelectricityorrunningwater. 3.WhatmadeJessedecidetosailalonearoundtheworldaccordingtothepassage? A.Hischildhoodadventureexperiences. B.HisjourneystoEurope. C.Hisloveforoutdooractivities. D.Hisfirstsailingtripwithhisfamily. 4.WhatcanwelearnfromJesseMartin'sstory? A.Lifeisanunusualadventureweshouldenjoy. B.Failureisthemotherofsuccess. C.Astrongbeliefwillmakeapersonstronger. D.Greatinterestcontributestosuccess.
为筛选产蛋白酶的高产菌株某同学配制培养基在适宜条件下做了如下实验. 1为实现筛选目的应对步骤Ⅰ使用的培养基配方如何改进. 2为实现目的菌的分离和计数步骤Ⅱ使用的培养基中还应加入制成平板.倒平板后需要将培养皿倒置的目的是. 3要统计每克土壤样品中活菌数目最好采用的接种方法是.若培养后发现培养基上的菌落连成一片可能的原因是.实验时需要设置空白对照组的目的是. 4蛋白酶在生物医药和日用化工等生产领域具有重要的经济价值为降低生产成本需要对分离得到的蛋白酶高产菌株包埋固定.与固定化酶相比该方法的优点还有.为了使固定化蛋白酶高产菌株可以反复利用应在条件下使用以保证蛋白酶高产菌株的活性.
Ifyouarehungrywhatdoyoudo?Haveyourfavoritemealandstayquietafterthat?Justlikeyourstomachyourmindisalsohungry.Butitneverletsyouknowbecauseyoukeepitbusythinkingaboutyourfriendsorfavoritestars.Soitsilentlyservesyourneedsandneverletsitselfgrow.Whenmindlosesitsfreedomtogrowcreativity创造性setsafullstop.ThismightbethereasonwhyweallsometimesthinkWhathappensnext?Whycan'tIthink? Hungerofthemindcanbeactuallysolvedthroughwidereading.WhyreadingbutnotwatchingTV?Itisbecausereadinghasbeenthemosteducativetoolusedbyusrightfromchildhood.Sinceitdevelopsotherwaysofourlifewehavetotakehelpfromreading. Onceyoureadabookyourunyoureyesthroughthelinesandyourmindtriestoexplainsomethingtoyou.Theinterestingpartofthebookisstoredinyourmindasaseed种子.Nowthisseedisunknowinglyusedbyyoutodevelopnewideas.Ifitisusedmanytimesthesameseedcangiveyougreathelptorelatealotofthingswhichyouwouldhaveneverthoughtofinyourwildestdreams! Thisisnothingbutcreativity.Alsothismakesahugecontributiontoyourvocabulary.WithinnotimeyoucanstarttalkingwithyourfriendsinEnglishoranyotherlanguageandneverrunoutoftherightwords. Soguysdogivefoodforyourthoughtsbyreadingreadingandmorereading.Nowwhatareyouwaitingfor?Goandgetabook! 1.Whenyourmindishungrythebestwayis. A.thinking B.eating C.reading D.watchingTV 2.WhichofthefollowingisRIGHTaccordingtothepassage? A.Whenyoureadabookyourmindlosesitsfreedomtogrow. B.Inyourwildestdreamaseedcangrowalotofdifferentthings. C.Theinterestingpartofthebookyoureadcanhelpyoudevelopnewideas. D.WatchingTVisthemosteducativewayforustodevelopcreativityinourlife. 3.ThefollowingareadvantagesofreadingEXCEPTthat. A.readingfeedsyourhungrymind. B.readingmakescreativitysetafullstop. C.readingcanhelpyourelatealotofthings. D.readingwillcontributetoyourvocabulary. 4.What'sthepurposeofthepassage? A.Tointroduceabook. B.Topersuadeustoread. C.Toexplainhungerofmind. D.Totellushowtocreatethings.
AllI'veeverwantedisforJulieBakertoleavemealone.Forhertobackoff﹣youknowjustgivemesomespace. Itallstartedthesummerbeforesecondgradewhenourmovingvan家具搬运车pulledintoherneighborhood.Didweinvitehertogetintoourmovingvanandstartclimbingalloverboxes?No!Butthat'sexactlywhatshedidtakingoverandshowingofflikeonlyJulieBakercan. Mydadtriedtostopher.Hey!hesaidasshewasjumpingonboard.Whatareyoudoing?You'regettingdirteverywhere! Shedidn'tleavethough.Insteadsheplantedherselfonthefloorandstartedpushingabigboxwithherfeet.Don'tyouwantsomehelp?Shelookedmyway.Itsurelookslikeyouneedit. Hey!Don'tdothatmydadwarnedher.Therearesomereallyvaluablethingsinthatbox. Oh.Wellhowaboutthisone?Shemovedswiftlyovertoanotherboxandlookedmywayagain.Weshouldpushittogether! Nonono!mydadsaidthenpulledherupbythearm.Whydon'tyourunalonghome?Yourmother'sprobablywonderingwhereyouare. OhmymomknowswhereIam.Shesaiditwasfine.ThenshepointedacrossthestreetandsaidWejustliverightoverthere. Myfatherlookedtowhereshewaspointingandsighed叹息Ohboy.Thenhelookedatmeandwinked眨眼ashesaidBryceisn'tittimeforyoutogoinsideandhelpyourmother? Iknewrightoffwhatthatmeantandmanhedidn'thavetowinktwice.IsmiledandsaidSurething!thenjumpedofftheliftgateandheadedformynewfrontdoor. IheardhercomingaftermebutIcouldn'tbelieveit.Maybeitjustsoundedlikeshewasrunningaftermemaybeshewasreallygoingotherway.ButbeforeItookupthecouragetolooksheranrightpastmegrabbedmyarmandfiercelypulledmealong. Thiswastoomuch.Istoppedrunningandwasabouttotellhertogetlostwhentheweirdest诡异的thinghappened.Iwasmakingthisbigcirclemovetobreakawayfromherbutsomehowmyhandendeduptangling缠结intohers.Icouldn'tbelieveit.ThereIwasholdingthedirtymonkey'shand! ItriedtoshakeheroffbutshejustheldontightandpulledmealongsayingComeon! 1.WhendidBryceandJulieBakerfirstmeet? A.Inthesummervacationaftersecondgrade. B.Inthesummerbeforethemovingvancame. C.WhenBryce'sfamilymovedtoJulie'sneighborhood. D.WhenJulie'sfamilywasreadytomoveoutoftheneighborhood. 2.WhatdidBryceandhisdadthinkofJulieBaker? A.JulieBakerwasadirtytrouble﹣maker. B.JulieBakerwasalovelyandactivegirl. C.JulieBakerwasaveryfriendlyneighbor. D.JulieBakerwasawarm﹣heartedandhelpfulgirl. 3.WhydidBryce'sdadwinkathimashetalked? A.HewantedtoplayajokeonBryce. B.HetriedtopersuadeBrycetohelphismother. C.HeplannedwithBrycetofoolJulietoleavethem. D.HemeanttocheatBryceandJulietogobackhome. 4.Whatwouldprobablyhappennext? A.BryceandJuliewouldhaveafight. B.Juliewouldgobacktoherownhome. C.BryceandJuliewouldplaytogetherlikefriends. D.JuliewouldfollowBrycetohishometohelphismother.
物理学重视逻辑崇尚理性其理论总是建立在对事实观察的基础上.下列说法正确的是
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