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有一种标签破损的片状胃药，某校化学兴趣小组欲对该胃药的主要成分进行实验探究．已知该胃药可以治疗胃酸过多，其主要成分是MgCO3、Al（OH）3中的一种或二种． 【查阅资料】①MgCO3受热能分解，...
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有一种标签破损的片状胃药某校化学兴趣小组欲对该胃药的主要成分进行实验探究已知该胃药可以治疗胃酸过多其
.某化学兴趣小组对胃药碳酸氢钠片进行了探究具体做法如下Ⅰ.取1片胃药研碎加水完全溶解得到100g溶液
某校化学实验室有一瓶标签残缺的过氧化氢溶液如图Z7－12所示该校化学兴趣小组的同学为了测定其溶质质量
有一种标签破损的片状胃药某校化学兴趣小组欲对该胃药的主要成分进行实验探究已知该胃药可以治疗胃酸过多其
有一种标签破损的片状胃药某校化学兴趣小组欲对该胃药的主要成分进行实验探究已知该胃药可以治疗胃酸过多其
某化学兴趣小组对胃药碳酸氢钠片进行了探究具体做法如下Ⅰ.取一片胃药研碎加水完全溶解得100g溶液Ⅱ.
某校共有三个兴趣小组分别为体育书法和美术已知参加这三个兴趣小组的学生分别是25人24人30人同时参加
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某胶囊是一种常用的治疗胃酸过多的药品其主要成分为一种两性氢氧化物某同学欲对该胶囊内的白色固体的主要成
化学兴趣小组欲用如图某胃药标签进行物质成分分析.取20片该药片研碎放入烧杯中再向烧杯中滴加稀盐酸至恰
某校共有三个兴趣小组分别为体育书法和美术已知参加这三个兴趣小组的学生分别是25人24人30人同时参加
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有一种标签破损的片状胃药某校化学兴趣小组欲对该胃药的主要成分进行实验探究已知该胃药可以治疗胃酸过多其
有一种胃药主要成分是MgOH2可以用来中和胃酸主要成分是盐酸过多则该反应的化学方程式为其基本反应类型
某化学兴趣小组对胃药碳酸氢钠片进行了探究具体做法如下Ⅰ.取1片胃药研碎加水完全溶解得到100g溶液Ⅱ
如图是某胃药标签上的部分内容某中学化学兴趣小组欲测定该药品中碳酸氢钠NaHCO3的质量分数取20片该
化学兴趣小组为了探究化学实验室里的一种黑色粉末和一瓶标签破损的无色溶液标签如下图可能是什么物质大胆猜
.有一种标签破损的片状胃药某校化学兴趣小组欲对该胃药的主要成分进行实验探究已知该胃药可以治疗胃酸过多
某校共有三个兴趣小组分别为体育书法和美术已知参加这三个兴趣小组的学生分别是25人24人30人同时参加
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某胶囊是一种常用的治疗胃酸过多的药品其主要成分为一种两性氢氧化物某同学欲对该胶囊内的白色固体的主要成
如图是某胃药标签上的部分内容振衡中学化学兴趣小组欲测定该药品中碳酸氢钠NaHCO3的质量分数取10片
某校有三个兴趣小组甲乙两名学生每人选择其中一个参加且每人参加每个兴趣小组的可能性相同则甲乙不在同一兴
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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
已知函数fx=x+sinx+1且fa=3则f-a=．
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.
已知函数fx是定义域为[-33]的奇函数当-3≤x≤0时fx=x2-2x那么不等式fx+1＞f3-2x的解集
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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