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小辉同学用伏安法测导体的电阻实验方案和操作过程均正确两表的连接和示数如图所示.这个实验可以改进的地方
如图所示的实验操作正确的是
如图所示的实验操作中正确的是
量取液体
加热液体
滴加液体
点酒精灯
看图回答下列问题:1如图所示的实验操作中正确的是填字母2指出图中不正确的实验操作及可能造成的后果:①
正确的实验操作对实验结果人生安全都非常重要如图所示实验操作不正确的是
如图所示实验操作正确的是
过滤
检查装置的气密性
金属与酸反应
加热液体
某同学用伏安法测一段导体的电阻其实验方案与操作过程均正确两表的示数如图所示你认为这个实验可以改进的地
如图所示实验操作正确的是
熄灭酒精灯
过滤
稀释浓硫酸
将固体药品装入试管中
实验室用高锰酸钾制取氧气的部分操作如图所示其中正确的是
装药品
制备
收集
验满
如图所示的实验操作中正确的是
如图所示实验操作正确的是
熄灭酒精灯
过滤
稀释浓硫酸
将固体药品装入试管中
实验室配制50g质量分数为6%的氯化钠溶液整个配制过程如图所示其正确的操作顺序是
③①②④⑤
①③④②⑤
③①④②⑤
①④③②⑤
1.5分如图所示的基本实验操作中正确的是
如图所示实验操作正确的是
过滤
检查装置的气密性
金属与酸反应
加热液体
正确的实验操作是获得正确的实验结果和保障人身安全的前提下如图所示的实验操作正确的是
用实验探究恒力做功和物体动能变化之间的关系.1某同学的实验设计方案如图所示该实验用钩码的重力表示小车
正确的化学实验操作对实验结果人身安全都非常重要．在如图所示实验操作中正确的是
某实验小组在测定金属电阻率的实验过程中正确操作获得金属丝的直径及电流表电压表的读数如图所示则它们的读
正确规范的操作是实验成功的关键如图所示实验操作符合规范的是
滴加液体
滴管用后洗涤插回原瓶
倾倒液体
测定溶液的pH
如图所示下列实验基本操作中正确的是
①②③④
②③
③
②③④
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WhenChristopherColumbuslandedonthethenunnamedCostaRicain1502hesawmanyIndianswearinggoldearrings.Sohethoughtthelandmustberichingold.HenamedtheplaceCostaRicawhichmeansrichcoastinSpanish. ThoughlittlegoldwasfoundCostaRicatodayisindeedrichwithcoffeeandbananas.CoffeeisthemostimportantproductinCostaRicaandmostofitisexportedtoothercountrieslikeAmericaandWestGermany.Bananasarethecountry'ssecondmostimportantexport. CostaRicansalsogrowmanyothercropssuchasfruitscornandbeansfortheirownuse.CostaRicanslovecolorsandtheirhousesarepaintedinbrightcolors. EducationisveryimportanttotheCostaRicans.Almosteveryvillagehasaschoolandeducationisamustforchildrenbetweensevenandfourteenyearsofage.Boysandgirlsgotoseparateschools.ClassesbegininMarchandendinNovember.Theotherthreemonthsoftheyearareharvesttimeandthechildrenhavetohelptheirparentstopickcoffeebeans. 1What'sthemainideaofthefirstparagraph? A.HowColumbusfoundCostaRica. B.HowCostaRicagotitsname. C.WhattheCostaRicanswore. D.WhatlanguagetheCostaRicansspoke. 2TheCostaRicansmayNOTpainttheirhouses. A.pinkandred B.greyandblack C.blueandgreen D.yellowandorange 3InCostaRicaboysandgirlsbetweensevenandfourteen. A.mustgotoschool B.studyinthesameschool C.donothavetogotoschoolatall D.canchoosetostopschoolingatanytime 4FromDecembertoFebruaryschoolchildreninCostaRica. A.havelessonseveryday B.havetheirexaminations C.helptheirparentspickcoffeebeans D.helptheirparentsdecoratetheirhouses 5Thispassageismainlyabout. A.ChristopherColumbus B.CostaRica C.someproductsfromCostaRica D.theeducationofCostaRic
DirectionsWriteanEnglishcompositionin120﹣150wordsaccordingtotheinstructionsgivenbelowinChinese. 作为一名高中生你认为什么品质是你最需具备的?请通过一个事例来说明理由.
Somepeoplethinkthatsuccessisonlyforthosewithtalentorthosewhogrowupintherightfamilyandothersbelievethatsuccessmostlycomesdowntoluck.I'mnotgoingtosaylucktalentandcircumstancesdon'tcomeintoplaybecausetheydo.Somepeoplearebornintotherightfamilywhileothersarebornwithgreatintelligenceandthat'sjusttherealityofhowlifeis. Howevertosucceedinlifeonefirstneedstosetagoalandthengraduallymakeitmorepractical.Andinadditiontothatinordertogetreallygoodatsomethingoneneedstospendatleast10000hoursstudyingandpracticing.Tobecomegreatatcertainthingsit'llrequireevenmoretimetimethatmostpeoplewon'tputin. Thisisabigreasonwhymanysuccessfulpeopleadviseyoutodosomethingyoulove.Ifyoudon'tenjoywhatyoudoitisgoingtofeellikeunbearablepainandwilllikelymakeyouquitwellbeforeyoueverbecomegoodatit. Whenyouseepeopleexhibitingsomegreatskillsorhavingachievedgreatsuccessyouknowthattheyhaveputinahugepartoftheirlifetogetthereatahugecost.It'ssometimeseasytothinktheygotluckyortheywerebornwithsomeraretalentbutthinkingthatwaydoesyounogoodandthere'sahugechancethatyou'rewronganyway. Whateveryoudoifyouwanttobecomegreatatityouneedtoworkdayinanddayoutalmosttothepointofaddictionandoveralongperiodoftime.Ifyou'renotwillingtoputinthetimeandworkdon'texpecttoreceiveanyrewards.Consistenthardworkwon'tguaranteeyouthelevelofsuccessyoumaywantbutitwillguaranteethatyouwillbecomereallygoodatwhateveritisyouputallthatworkinto. 1Paragraph1mainlytalksabout. A.thereasonsforsuccess B.themeaningofsuccess C.thestandardsofsuccess D.theimportanceofsuccess 2InParagraph2theunderlinedwordthatrefersto. A.beinggoodatsomething B.settingapracticalgoal C.puttinginmoretime D.succeedinginlife 3Successfulpeoplesuggestdoingwhatonelovesbecause. A.workmakesonefeelpain B.onetendstoenjoyhiswork C.onegivesuphisworkeasily D.ittakesalotoftimetosucceed 4WhatcanweinferfromParagraph4? A.Successfulpeopleliketoshowtheirgreatskills. B.Peoplesometimessucceedwithoutluckortalent. C.Peopleneedtoachievesuccessatthecostoflife. D.Ithelpstothinkthatluckortalentleadstosuccess. 5Whatisthemainthemeofthepassage? A.Havingagoalisvitaltosuccess. B.Beinggoodisdifferentfrombeinggreat. C.Onecannotsucceedwithouttimeandpractice. D.Lucktalentandfamilyhelptoachievesuccess
It'sabighammertocrackanut.Thisishowoneangryparentdescribedtherecentcrackdown强制措施byLondonpoliceonparentswhodroptheirkidsoffatschoolbycar.Yesyoureadthatcorrectly﹣theverymodeoftransportationthatmanyAmericanschoolsinsististheonlysafewaytodeliverkidstoschoolisnowconsideredillegalintheUK. ThedecisiontofineanyvehiclesseendroppingofforpickingupkidswithinaparticularzoneofeastLondoncomesfromcitycouncilors'议员long﹣termeffortstomaketheareasaferandlesscrowded.Theysaythey'vebeentryingforyearstoencouragereasonableparkingbutinvain.Neighborhoodresidentscomplainfrequentlyabouttheirdrivewaysbeingblockedbyillegallyparkedcarsfor15minutesormoreoftenwhilethey'retryingtogettoworkandthestreetsarelongovercrowded. Nowtheruleshavechanged.Someparentsareangry.Angieisamotherwhomadethebighammercommentandsaysthecrackdowniswayoverthetop.Thenearestdrop﹣offpointforhersix﹣year﹣oldisnowafive﹣minutewalkfromtheschool.Othersarehappywiththedecisionseverethoughitmayseem. CouncilorJasonFrostsaidTraffichasclearlyreducedandmorechildrenarenowwalkingtoschoolwhichisagreatoutcome.Iwouldratherhavecomplaintsthatweareslightlyinconveniencingparentsthanhearthatachildhadbeenseriouslyinjuredbecausenothingwasdone. Iwitnessdailythechaos混乱createdbythesein﹣towndriverswhenIwalkmyownkidstoschool.There'saparkinglotcrowdedwithvehiclesandaslow﹣movingtrainofcarsmovingincirclesmanyfillingtheairwithharmfulsmokes.Meanwhiletheconversationsaroundchildover﹣weightandtheimportanceofdailyphysicalactivitycontinuetostandoutinschools. 1WhyisAngieopposedtothenewrule? A.SheisoftenfinedbyLondonpolice. B.Shewillloseherjobasaschooldriver. C.ShehasadaptedtotheAmericanpractice. D.Shethinksitaddsinconveniencetoherson. 2WhyhasthenewrulebeenmadeaccordingtoJasonFrost? A.Onaccountofmanycomplaints. B.Becauseofheavytrafficjams. C.Owingtosafetyconcern. D.Duetoairpollution. 3Whatcanbeseenafterthecrackdowniscarriedout? A.Lessdailychaos. B.Supportfromallpeople. C.Moreover﹣weightchildren. D.Complaintsfromneighbors. 4Whatisthemainideaofthetext? A.Parentsattempttoresistaschoolrule. B.Londonpolicecausewidespreadanger. C.Americanschoolscaremoreaboutkids'safety. D.Differentvoicesareheardonanewtrafficpolicy.
如图所示四边形ABCD是边长为4cm的正方形动点P在正方形ABCD的边上沿着A→B→C→D的路径以1cm/s的速度运动在这个运动过程中△APD的面积scm2随时间ts的变化关系用图象表示正确的是
某学生对其30位亲属的饮食习惯进行了一次调查并用茎叶图表示这30人的饮食指数说明图中饮食指数低于70的人饮食以蔬菜为主饮食指数高于70的人饮食以肉类为主． 1根据茎叶图帮助这位学生说明两个年龄段亲属的饮食习惯 2根据以上数据完成下列2×2的列联表 3请用独立性检验知识分析“能否有99%的把握认为其亲属的饮食习惯与年龄有关” 参考公式及数据K2=n=a+b+c+d．
ForRachaelandLeighBarmanthereisonlyonewishontheirChristmaslistthisyear﹣﹣﹣thattheirsickdaughterPaigeshouldsurviveuntilDecember25.Fifteen﹣year﹣oldPaigesuffersfrom1rarebraindisease2affects影响asfewas12peopleintheworldandcouldkillheranyday3warning警告. Andherconditionhasgoneeven4badinrecentmonths.HerparentsfilledthefamilyhomewithChristmasdecorations5September1stsoshecouldenjoytherestofherlife.Sincethenshehas6regularopenedChristmaspresentsandreceivedvisitors﹣﹣﹣butshesleepsforupto19hoursadayherparentsknowingthateachtimeshecloseshereyesshemayneverwakeup. MrsBarman7describedealingwiththeconditionaslikebeingondeathrowassheneverknewif8daughterwouldwakeupthenextmorning. ThemothersaidShealwayslovesChristmasandIgetmyheart9breakwhenIseehersufferinglikethisOurbestChristmaspresentwouldbehavingPaigewithusatChristmas.Nomatter10sheleavestheworldwemakesurethatsheisalwayshappy.
LastyearmybrotherandIwenttoMiamiforavacation.Someofmyfriendswhohadbeentherebeforesaid1wasawonderfulholidaydestination.Beforewewentwehadplannedformonthswhenthedaycamewewereready. Afterourplanelandedwewenttothehotel.Wehadmadeourreservationsixmonths2earlybutthemanatthefrontdesksaidtherehadbeenamistake.We3tellthatourroomshadn'tbeenreservedforthatweek4fortheweekafter.Ididn'tunderstand5thiswouldhappenandmycreditcardhadalreadybeencharged6thereservation.What'sworsethehotelhadbeenfullybooked.Whenwewerewonderingwhattodothemanagercameout.Shewas7surprisehelpful.SheapologizedforthemistakeandgaveusaspareVIProomon8topfloor.Wehadneverstayedinsuchanamazingroomandweweren'tchargedextra. ThenextdaymybrotherandIwenttothebeach9wewatchedsomepeopleplayvolleyball.Wegotalittle10sunburnbutthedayhadbeensorelaxingthatwedidn'tmind.
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.错误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. NowadaysmoreandmoreConfuciusInstitutesarebeingbuildingallovertheworldthatshowsourChineseculturehasbecomemorepopularthanever.OnonehandtheancientChinesecultureoncehadagreatinfluenceinotherculturesespeciallythoseofAsiancountry.OnotherhandourChinesecultureconstantdevelopedthroughoutthelonghistorythusmadeitmorecolorfulandmorebrilliant.ConfuciusInstitutesaregoodplaceswheretolearnabouttheChineseculture.Whoeverwanttoknowmoreaboutitmustspendmoretime.ThereforeheorshecannothaveagoodknowledgeoftheChineseculture.
我总是对那些在我失意时安慰我的人心存感激.grateful
Whilegettingreadyforschooltodaymy16﹣year﹣olddaughtercameintomyroomtogivemeabighugandkiss.IaskedherWhatdoyouwant?ShesaidNothingMumyoualwaystellustohaveagooddaybeforeweleavethehousebutIwasthinkingaboutwhotellsyoutohaveagooddayandletsyouknowhowmuchyouareloved. Iamsotouchedbythecapacityofloveandunderstanding1comesfrommychildren.My15﹣year﹣oldsonaskedmelastnight2therewasawayforhimtogetasummerjobthisyearinordertohelpustopayourbills.Unfortunatelyinourareahe3be16. 4ofmychildrendependonmesomuchbecauseIamasingleparentbutjustwhenIpaythebillsthatIwillnotbeabletoprovideforthemtheycomeupwithways5helpout.IcompletelyunderstandthatIwillstillhavetofindawaytopaythebillsasIdonotwantmychildrentotakeupanything.Butfornowthefact6theyhavesteppedupandofferedtohelpwithoutanyoneasking7touchme. WhenmydaughterwastwoIrememberrushingtogettoworkgettingtothefrontdoorandaskinghertohurryupandcome.Thensheappearedatthedoor8abagthatshewasholdingopen.IsaidWedon'thavetimeforthis.ShestoppedmeandsaidFillitwithloveMum.Ifelltomykneesandhuggedherandthenkissedher.FromthenonshewouldbringthebagandIwouldbringthelovetothedoorbefore9leaveforschoolandwork.
他不感激他朋友们为他所做的牺牲把这视作是理所当然的.appreciate
JonHoffmanwassittingataredlightwhenhesawamanrunoutofastorecarryingaplasticdonationjarfullofcash.DressedinplainclothesJonHoffmancaughtthemanandpressedhimagainstthehood引擎盖ofhiscar.ButHoffmanhadtroublecontrollingthethiefandtheygotintoastruggle. Thedetectivehasamilitarybackgroundandhesaidhethoughtthesuspectmusthaveamilitarybackgroundtoobecausehewasabletobreakawaysoeasilyalocalpolicespokespersonsaid. Thedetectivecalledoutforhelpasacrowdgathered.AmongthosewatchingwereHarveyandKirbytwodaylaborers. Harveydidwhathasbecomecommonthesedays﹣﹣﹣hetookouthisphonetoshootthevideo.IhatetosayitbutIthoughtthatthispolicemanwasdoingsomethingstupidHarveysaid.ButwhenheaskedforhelpIthoughtwelltherewouldn'tbeshootingifIgotoverthereintime.Harveyjumpedintoactionwhilehewasstillrecordingthevideo.SodidKirby. Harveycaughtholdofthesuspect'sarmswhileKirbyseizedhislegsandtheywereabletogetthesuspecttothegroundtohelpDetectiveHoffmanputthehandcuffs手铐on.saidthepolicespokesperson.The27﹣year﹣oldsuspectwaschargedwithresistingarrestandotheroffenses.Thecharityjarhestoleheldlessthan﹩50. I'vebeenonthewrongsideofthelawseveraltimesinmylifeHarveysaid.Itfeelsgoodtobeonthefightsideanddosomethingpositive. Afterthearrestthethreemengottoknoweachotheratalocalsteakhouse﹣﹣﹣Hoffman'streatasathankyou. 1WhatmadeHoffmancallforhelpwhenarrestingthesuspect? A.Hewasnotonduty. B.Hecouldn'tcontrolthesuspect. C.Heneededwitnessestosupporthim. D.Hewantedtopushthethiefintothecar. 2WhydidHarveyandKirbyrecordthesceneatthebeginning? A.Tofollowthefashion. B.Torecordthedetective'ssillyaction. C.Tokeeptrackofthecriminal. D.Toavoidbeinginvolvedintheincident. 3WhatcanbeinferredaboutHarvey? A.Hewasreadytobreakthelaw. B.Hewasoutofworkatthattime. C.Hehadagoodmilitarybackground. D.Hemighthavehadsomeillegaldeeds. 4WhatisHoffman'sattitudetowardsHarveyandKirby? A.Grateful. B.Prejudiced. C.Skeptical. D.Admirable.
已知函数fx=|2x-4|+|x+1|x∈R． 1解不等式fx≤9 2若方程fx=-x2+a在区间[02]有解求实数a的取值范围．
某超市为了解气温对某产品销售量的影响随机记录了该超市12月份中5天的日销售量y单位千克与该地当日最低气温x单位°C的数据如表所示 1求y关于x的线性回归方程=x+精确到0.001 2判断y与x之间是正相关还是负相关若该地12月份某天的最低气温为6°C请用1中的回归方程预测该超市当日的销售量． 参考公式b==a=-b． 参考数据xiyi=2×12+5×10+7×9+9×8+12×6=281=22+52+72+92+122=303．
IwastenwhenIfirstsatwithmygrandmotherbehindthecashier收银台inhergeneralstore.1Iquicklylearnedtheimportanceoftreatingcustomerspolitelyandsayingthnakyou. AtfirstIwaspaidincandy.2Iworkedeverydayafterschoolandduringthesummerandonweekendsandholidaysfrom8a.m.to7p.m.Myfatherhelpedmesetupabannkaccount.3 BythetimeIwas12MygrandmotherthoughtIhaddonesuchagoodjobthatthepromotedmetosellingcosmetics化妆品.Idevelopedtheabilitytolookcustomersdirectlyintheeye.EventhoughIwasjustakidwomenwouldaskmesuchthingsasWhatcolordoyouthinkIshouldwear?Itookarealinterestintheirquestionsandwasabletotranslatewhattheywantedintomakeup化妆ideas.4 Thejobtaughtmeavaluablelessontobeasuccessfulsalespersonyoudidn'tneedtobeaRocketscientist﹣youneededtobeagreatlistener.5expecttheyareNOlongerwomenpurchasingcosmeticsfrommeinsteadtheyarekidswhotellmewhichtoystheywouldliketoseedesignedanddeveloped. A.LaterIreceived50centsanhour. B.Beforelongsheletmesirtherebymyself. C.Iendedmysellingarecordamountofcosmetics. D.TodayIstillcarrythatlessonwithmeIlistentocustomers. E.Mygrandma'strusttaughtmehowtohandleresponsibility. F.SoonIfoundmyselflookingmorebeautifulthaneverbefore. G.WatchingmymoneygrowwasmorerewardingthananythingIcouldhavebought.
已知实数ab满足2a+b=2则4a+2b的最小值为．
阅读材料设一元二次方程ax2+bx+c＝0a≠0的两根为x1x2则两根与方程系数之间有如下关系x1+x2＝﹣x1•x2＝．根据该材料填空已知x1x2是方程x2+6x+3＝0的两实数根则+的值为
Whileresidentsofwealthynationstendtohavegreaterlifesatisfactionnewresearchshowsthatthoselivinginpoorernationsreporthavinggreatermeaninginlife. ThesefindingspublishedinPsychologicalScienceajournaloftheAssociationforPsychologicalsciencesuggestthatmeaninginlifemaybehigherinpoorernations1greaterreligiosity笃信zōng jiāo .Ascountriesbecomericherreligionbecomesless2topeople'slivesandtheyloseasenseofmeaninginlife. Thusfarthewealthofnationshasbeenalmostalways3longevityhealthhappinessorlifesatisfactionexplainspsychologicalscientistShigehiroOishioftheUniversityofVirginia.Giventhatmeaninginlifeisanimportantaspectofoverallwell﹣beingwewantedtolookmorecarefullyatdifferential4correlates相关物andpredictorsformeaninginlife. OishiandcolleagueEdDieneroftheUniversityofIllinoisatUrbana﹣Champaign5lifesatisfactionmeaningandwell﹣beingbyexaminingdatafromthe2007GallupWorldPolla6surveyofover140000participantsfrom132countries.7answeringabasiclifesatisfactionquestionparticipantswereaskedDoyoufeelyourlifehasanimportant8ormeaning?andIsreligionanimportantpartofyourdailylife? Thedatarevealedsomeunexpected9 AmongAmericansthosewhoarehighinlifesatisfactionarealsohighinmeaninginlifesaysOishi.Butwhenwelookedatthesocietallevelofanalysiswefoundacompletely10patternoftheassociationbetweenmeaninginlifeandlifesatisfaction. WhenlookingacrossmanycountriesOishiandDienerfoundthatpeopleinwealthiernationsweremoreeducatedhadfewerchildrenandexpressedmoreindividualisticattitudescomparedtothoseinpoorercountries﹣allfactorsthatwereassociatedwithhigherlifesatisfactionbuta11lowersenseofmeaninginlife. ThedatasuggestthatreligiositymayplayanimportantroleResidentsofwealthiernationswherereligiosityislowerreported12meaninginlifeandhadhighersuicideratesthanpoorercountries. Accordingtotheresearchersreligionmayprovidemeaningtolifetotheextentthatit13peopletoovercomepersonaldifficultyandcopewiththestrugglesofworkingtosurviveinpooreconomicconditions OishiandDienerhopetoreproducethesefindingsusingmorecomprehensivemeasuresofmeaningandreligiosityandareinterestedin14countriesovertimetotrackwhethereconomic15givesrisetolessreligiosityandlessmeaninginlife. 1A.bymeansof B.asaresultof C.forthesakeof D.withregardto 2A.central B.ideal C.formal D.superior 3A.relatedwith B.combinedwith C.associatedwith D.representedwith 4A.models B.styles C.designs D.patterns 5A.investigated B.diagnosed C.explored D.exploited 6A.nationwide B.thorough C.complete D.large﹣scale 7A.Exceptfor B.Insteadof C.Ratherthan D.Inadditionto 8A.opportunity B.temptation C.purpose D.definition 9A.trends B.practices C.outlooks D.currents 10A.precious B.similar C.relevant D.different 11A.exactly B.significantly C.adequately D.partially 12A.better B.less C.more D.fewer 13A.allows B.requests C.reminds D.helps 14A.following B.chasing C.pursuing D.predicting 15A.priority B.profit C.prosperity D.potential
请写一篇吸烟危害的短文. 内容要点吸烟会导致许多疾病甚至一些危及生命的疾病. 吸烟不但对吸烟者自己有害也严重影响不吸烟者的健康. 据报道美国每年至少有32万人因吸烟而丧生.目前约有四千万人仍在吸烟. 可喜的是越来越多的人已认识到其危害开始戒烟. 青年学生不应该养成这一恶习如有这一习惯应尽早戒除.
FeaturedLasVegasHotels 1Wherecanfindthisinformation? A.Thetravelagency'sleaflet B.TheGlobalTravelerMagazine C.www.USAtour.com D.Advertisement 2Whichofthefollowingisnottrue? A.CircusCircusisthecheapestoneamongthefourhotels. B.LivinginVenetianResortHotelCasinoenablesyoutotraveltoVeniceforfree. C.Emmanuel.Mwasquitesatisfiedwithboththeenvironmentandthelocationofthehotelhelivedin. D.LuxorHotelandCasinohasaveryspecialappearance. 3Ifyoucarealotabouttheservicebuthaveatightbudgetwhichhotelwillyouchoose? A.LuxorHotelandCasino B.VenetianResortHotelCasino C.CircusCircusHotelandCasino D.PalaceStationHotel
如图水平地面上有一面积为30cm2的扇形AOB半径OA＝6cm且OA与地面垂直在没有滑动的情况下将扇形向右滚动至OB与地面垂直为止则点O移动的距离为
如图将两张长为5宽为1的矩形纸条交叉让两个矩形对角线交点重合且使重叠部分成为一个菱形．当两张纸条垂直时菱形周长的最小值是4把一个矩形绕两个矩形重合的对角线交点旋转一定角度在旋转过程中得出所有重叠部分为菱形的四边形中周长的最大值是
IwasneververyneatwhilemyroommateKatewasextremelyorganized.Eachofherobjectshaditsplacebutminealwayshidsomewhere.Sheevenlabeled贴标签everything.Ialwayslookedforeverything.OvertimeKategotnearerandIgotmessier.ShewouldpushmydirtyclothingoverandIwouldlaymybooksonhertidydesk.Webothgottiredofeachother. Warbrokeoutoneevening.Katecameintotheroom.SoonIheardherscreamingTakeyourshoesaway!Whyundermybed!DeafenedIsawmyshoesflyingatme.Ijumpedtomyfeetandstartedyelling.Sheyelledbacklouder. Theroomwasfilledwithanger.Wecouldnothavestayedtogetherforasingleminutebutforaphonecall.Kateansweredit.FromherendoftheconversationIcouldtellrightawayhergrandmawasseriouslyill.Whenshehungupshequicklycrawled爬underhercoverssobbing. Obviouslythatwassomethingsheshouldnotgothroughphone.Allofasuddenawarmfeelingofsympathyroseupinmyheart SlowlyIcollectedthepencilstookbackthebooksmademybedcleanedthesocksandsweptthefloorevenonherside.IgotsointomyworkthatIevendidn'tnoticedKatehadsatup. Shewaswatchinghertearsdriedandherexpressiononeofdisbelief.Thenshereachedoutherhandstograspmine.Ilookedupintohereyes.Shesmiledatme.Thanks. KateandIstayedroommatesfortherestoftheyear.Wedidn'talwaysagreebutwelearnedthekeytolivingtogethergivingin.cleaningupandholdingon. 1WhatmadeKateangryoneevening? A.Shecouldn'tfindherbooks. B.Sheheardtheauthorshoutingloud. CShegotthenewsthathergrandmawasill. D.Shesawtheauthor'sshoesbeneathherbed. 2Theauthortidieduptheroommostprobablybecause. A.shewasscaredbyKate'sanger B.shehatedherselfforbeingsomessy C.shewantedtoshowhercare D.shewasaskedbyKatetodoso 3HowisParagraphImainlydeveloped? A.Byanalyzingcauses. B.Byshowingdifferences. C.Bydescribingaprocess. D.Byfollowingtimeorder. 4Whatmightbethebesttitleforthestory? A.MyFriendKate B.HardWorkPaysOff C.HowtoBeOrganized D.LearningtoBeRoommates
Someoftheworld'smostsignificantproblemsneverhitheadlines.Oneexamplecomesfromagriculture.Foodriots暴乱andhungermakenews.Butthetrendlyingbehindthesemattersisrarelytalkedabout.Thisisthedeclineinthegrowthinyields产量ofsomeoftheworld'smajorcrops.AnewstudybytheUniversityofMinnesotaandMcGillUniversityinMontreallooksatwhereandhowfarthisdeclineisoccurring. Theauthorstakeavastnumberofdatapointsforthefourmostimportantcropsricewheatcornandsoybeans.Theyfindthatonbetween24%and39%ofallharvestedareastheimprovementinyieldsthattookplacebeforethe1980ssloweddowninthe1990sand2000s. Therearetwoworryingfeaturesoftheslowdown.Oneisthatithasbeenparticularlysharpintheworld'smostpopulouscountriesIndiaandChina.Theirabilitytofeedthemselveshasbeenanimportantsourceofrelativestabilitybothwithinthecountriesandonworldfoodmarkets.Thatself﹣sufficiencycannotbetakenforgrantedifyieldscontinuetoslowdownorreverse. Secondyieldgrowthhasbeenlowerinwheatandricethanincornandsoybeans.Thisisproblematicbecausewheatandricearemoreimportantasfoodsaccountingforaroundhalfofallcaloriesconsumed.Cornandsoybeansaremoreimportantasfeedgrains.Theauthorsnotethatwehavepreferentiallyfocusedourcropimprovementeffortsonfeedinganimalsandcarsratherthanoncropsthatfeedpeopleandarethebasisoffoodsecurityinmuchoftheworld. Thereportqualifiesthemoreoptimisticfindingsofanothernewpaperwhichsuggeststhattheworldwillnothavetodigupalotmorelandforfarminginordertofeed9billionpeoplein2050astheFoodandAgricultureOrganizationhasargued. Insteaditsaysthankstoslowingpopulationgrowthlandcurrentlyploughedupforcropsmightbeabletoreverttoforestorwilderness.Thiscouldhappen.Thetroubleisthattheforecastassumescontinuedimprovementsinyieldswhichmaynotactuallyhappen. NoteAnswerthequestionsorcompletethestatementsinNOMORETHANTWELVEWORDS. 1Thetrendlyingbehindfoodriotandhungeris. 2WhydoestheauthormentionIndiaandChinainparticular? 3Accordingtothenewstudywhat'stheproblemoftherecentcropimprovementefforts? 4Whatistheauthor'sattitudetotheargumentoftheFoodandAgricultureOrganization?
Asweallknowfriendshipisofgreatimportanceinourdailylife.Afriendcangiveushelpandshareourdifficultiesandhappiness.Buthowtomakefriendsisstilldifficulttosomeofus.1 1.Befriendlytoothers.2Youshouldtrytomakeastrangerfeelathomewhereverhehappenstobe.Thinkmoreofothersthanofyourselfandneverjudgeapersonbyhisappearanceandclothes. 2.Bereliable.Ifyouandyourfriendagreetomeetsomewheredon'tbelate.Ifyou'renotgoingtomakeitontimeormakeitatallcallthemassoonasyourealizeit.3Besomeonethatpeopleknowtheycandependon. 3.4Listencarefullytowhatpeoplesayrememberimportantdetailsaboutthemtheirnamestheirlikesanddislikesaskquestionsabouttheirinterestsandjusttakethetimetolearnmoreaboutthem. 4.EncourageyourfriendsAtruefriendalwaysgivescouragetohisfriends.5Nevermakefunoforlaughatyourfriendsinfrontofothers.Youshouldcometosupportthem. A.Whenyousayyou'lldosomethingdoit. B.Afriendtoallisafriendtonone. C.Beagoodlistener. D.Thefollowinginformationcangiveyousometips E.Smileatothersandyouaresuretogetasmileinreturn. F.Hewillremainwiththeminbothgoodaswellasbadtimes. G.Andneverleaveyourfriendwhenheisintrouble.
已知全集U=R．集合A={x|1≤x≤3}集合B={x|3x＞9}． 1求∁UB∪A 2若集合C={x|a＜x≤a+1}且集合A与集合C满足C∩A=C求实数a的取值范围．
MyAmericanfriendkindlyinvitedmetoherhometocelebratethisyear'sThanksgivingDay.I1experiencemyfirsteverThanksgiving. OnthatdaywewatchedtheThanksgivingparade游行inNewYorkCityonTV.Myfriend'sfamilysat2frontofthetelevision.TheycamefromallovertheStatesandenjoyedbeingtogether.3lookattheirhappyfacesIthoughtitwasreallyaholidayforfamiliesjustliketheMid﹣AutumnFestivalinChina. ThateveningwehadabigThanksgivingdinner.This4traditionmealincludesroastturkeymashedpotatoesandassortedvegetables.Whenthedishesandplatesarrivedatthetablewestartedtotake5turntosaythethingswewere6thankfor.ThisinfactisaThanksgivingtraditionmanyfamiliespracticeintheUS. Thenthefood7passaroundthetableandweallatefartoomuch.Ialsohaddessertswithmydinner.There8bedifferentkindsofpiessuchasapplepiespumpkinpiesandcoconutpies. IfonementionsThanksgivingonemusttalkaboutBlackFridaytheFriday9followsThanksgivingDay.ShopsacrosstheUnitedStateswillgivetheir10bigsalesofthewholeyearonBlackFriday.Manypeoplegocrazyaboutit.Isawmanylongqueuesoutsidetheshopsonthatday.
FromchildhoodMoiralovedtowrite.Throughoutschoolshe1writingbutpursuing追求it2wasneverapossibility.Herfatherwasadoctorhermotheranurse.Medicinewasafairly3choiceMoirasaysAndwritingwasacareerwhereitwasn'ta4thatyou'dhavehighincome. Shebecameadoctorbutstillwantedtodosomewriting.Howeverbeingadoctorwasso5thatshedidn'ttakeupwritinguntilherthirties.She6anovel﹣afictionalizedversionofhertravelinChinaafteruniversity.Shegotexcellent7.Moirasentitoffasmanyagentsasshecouldfindandfoundonewhowantedto8her.Suddenlyitseemedshewasonher9asanauthor. Ihadonelengthyphonecallwiththeagentwherewe10allpossibleareasshethoughtneeded11.Iworkedonthoseandsentitbacktoherbutdidn'thearanything.Itwasn'tlong12Moirafoundanotheragentwhowas13ifshewaswillingtorewriteitfromthefirstpersontothethirdperson.Shedidthehardworkandsentitoffagain.Igotbackareallybriefletter‘ThankyouI'mnolongerinterested.'Itwasreally14. AdecadewentbyandMoirafoundherselfeagertowriteagainthistime15forherownenjoyment.She16herselfthechallengeofcreatingathrillerandchoseWesternAustraliaashersetting. Asshewaswritingjustforherselfsomethingsurprisingbegantohappen.Thecharacters17alifeoftheirowntheystarteddoingthingsIhadn'tthoughtabout.Itjust18out.OnedayanagentcalledfromAustralia.ThreeweekslaterMoirahadapublicationdeal.HernovelCicadawaspublishedinMarch. 19ithadn'tbeenpublishedIstillgainedsomuchfromthe20saysMoira. 1A.learnt B.avoided C.considered D.enjoyed 2A.actively B.professionally C.energetically D.permanently 3A.influential B.clear C.terrible D.safe 4A.dream B.purpose C.choice D.certainty 5A.promising B.discouraging C.demanding D.interesting 6A.produced B.introduced C.bought D.received 7A.rewards B.readers C.reviews D.praises 8A.employ B.represent C.trust D.guide 9A.own B.feet C.way D.business 10A.tookoff B.wentthrough C.pulleddown D.cameover 11A.deleting B.adapting C.polishing D.covering 12A.before B.after C.since D.when 13A.fascinated B.interested C.anxious D.amused 14A.common B.absurd C.terrifying D.disappointing 15A.purely B.wonderfully C.instantly D.sadly 16A.set B.found C.made D.permitted 17A.putup B.tookon C.wentover D.gotdown 18A.flew B.brought C.broke D.carried 19A.Eversince B.Asif C.Ifonly D.Evenif 20A.adventure B.practice C.process D.result
ItwasavillageinIndia.Thepeoplewerepoor.Howevertheywerenotunhappy.Afteralltheirforefathershadlivedinthesamewayforcenturies. Thenonedaysomevisitorsfromthecityarrived.Theytoldthevillagersthereweresomepeopleelsewherewholikedtoeatfrog'slegs.Howevertheydidnothaveenoughfrogsoftheirownandsotheywantedtobuyfrogsfromotherplaces. Thisseemedlikemoneyfornothing.Thereweremillionsoffrogsinthefieldsaroundandtheywerenousetothevillagers.Alltheyhadtodowascatchthem.Agreementwasreachedandthechildrenweresentintothefieldstocatchfrogs.Everyweekatruckarrivedtocollectthecatchandhandoverthemoney.Forthefirsttimethepeoplewereabletodreamofabetterfuture.Butthedreamdidn'tlastlong. Thechangewashardlynoticedatfirstbutitseemedasifthecropswerenotdoingsowell.Moreworryingwasthatthechildrenfellillmoreoftenandthereseemedtobemoreinsectsaroundlately. Thevillagersdecidedthattheycouldn'tjustwaittoseethecropsfailingandthechildrenhavetousethemoneyearnedtobuypesticides杀虫剂andmedicines.Soontherewasnomoneyleft. Thenthepeoplerealizedwhatwashappening.Itwasthefrog.Theyhadn'tbeenuseless.Theyhadbeendoinganimportantjob﹣eatinginsects.Nowwithsomanyfrogskilledtheinsectswereincreasingmorerapidly.Theyweredamagingthecropsandspreadingdiseases. Nowthepeoplearestillpoor.Butintheeveningstheysitinthevillagesquareandlistentosoundsofinsectsandfrogs.Thesesoundsofthenightnowhaveamuchdeepermeaning. 1Fromparagraph1welearnthatthevillagers. A.workedveryhardforcenturies B.dreamedofhavingabetterlife C.werepoorbutsomewhatcontent D.livedadifferentlifefromtheirforefathers 2Whydidthevillagersagreetosellfrogs? A.Thefrogswereeasymoney. B.Theyneededmoneytobuymedicine. C.Theywantedtopleasethevisitors. D.Thefrogsmadetoomuchnoise. 3Whatmightbethecauseofthechildren'ssickness? A.Thecropsdidn'tdowell. B.Thereweretoomanyinsects. C.Thevisitorsbroughtindiseases. D.Thepesticideswereoverused. 4Whatcanweinferfromthelastsentenceofthetext? A.Happinesscomesfrompeacefullifeinthecountry. B.Healthismoreimportantthanmoney. C.Theharmonybetweenmanandnatureisimportant. D.Goodolddaywillneverbeforgotten.
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