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如图甲，让激光束通过一个狭缝，观察到光屏上出现单色条纹图样．现保持激光器与狭缝到光屏的距离不变，将光屏向狭缝处适当移动，下面关于本实验说法正确的是（ ）
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高三下学期物理《》真题及答案
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关于激光扫描共聚焦显微镜下列有误的是
以单色激光作为光源
激光变成点光源后聚焦到标本成为点照明
点光源激光束在标本的整个焦平面进行光点扫描后在荧光屏上成像
图像信息要经电脑三维重建处理
所用标本须经超薄切片
如图a表示单缝b表示双缝用某单色光分别照射竖直放置的单缝和双缝在缝后较远位置竖直放置的光屏上可以观察
c表示单缝衍射条纹，图d表示双缝干涉条纹
单缝S.越宽，越容易观察到对应的明暗条纹
双缝间距离越小，对应条纹间距越大
照射双缝的单色光波长越小，对应条纹间距越大
某同学用单色光进行双缝干涉实验在屏上观察到如图甲所示的条纹仅改变一个实验条件后观察到的条纹如图乙所示
减少光源到单缝的距离
减少双缝到光屏之间的距离
减小双缝之间的距离
换用频率更小的单色光源
如图当用激光照射直径小于激光束的不透明圆盘时在网盘后屏上的阴影中心出现了一个亮斑这是光的现象这一实
如图所示用激光束照射双缝干涉实验装置后面屏上出现干涉条纹其中单缝的作用是产生线光源单缝双缝应平行放置
关于共焦激光扫描显微镜下列哪项有误
以单色激光作为光源
激光变成点光源后聚焦到标本成为点照明
点光源激光束在标本的整个焦平面进行光点扫描后在荧光屏上成像
图像信息要经电脑三维重建处理
所用标本须经超薄切片
如图当用激光照射直径小于激光束的不透明圆盘时在圆盘后屏上的阴影中心出现了一个亮斑这是光的填干涉衍射或
在观察光的干涉现象的实验中将两片刀片合在一起在涂有墨汗的玻璃片上划出不同间隙的双缝按图所示的方法让激
在观察光的干涉现象的实验中将两片刀片合在一起在涂有墨汁的玻璃片上划出不同间隙的双缝按图所示的方法让激
如图当用激光照射直径小于激光束的不透明圆盘时在圆盘后屏上的阴影中心出现了一个亮斑.这是光的填干涉衍射
抽制高强度纤维细丝时可用激光监控其粗细如图所示观察激光束经过细丝时在光屏上所产生的条纹即可判断细丝粗
这主要是光的干涉现象
这主要是光的衍射现象
如果屏上条纹变宽，表明抽制的丝变粗
如果屏上条纹变宽，表明抽制的丝变细
游标为20分度测量值可准确到0.05mm的卡尺示数如图1所示两测角间狭缝的宽度为mm.用激光照射该狭
用ab两单色光分别照射同一双缝干涉装置在距双缝恒定距离的光屏上得到如图所示的干涉图样其中图甲是单色光
）若光束a照在某金属上恰能发生光电效应，则光束b照到该金属上不能发生光电效应。 （
）若两束光都能使某金属发生光电效应，则光束a照到该金属表面到电子逸出的时间间隔明显比光束b长。 （
）它们在真空中具有相同大小的传播速度。 （
）在相同条件下，光束a比光束b更容易产生明显的衍射现象。
关于激光扫描共聚焦显微镜下列有误 的是
以单色激光作为光源
激光变成点光源后聚焦到标本成为点照明
点光源激光束在标本的整个焦平面进行光点扫描后在荧光屏上成像
图像信息要经电脑三维重建处理
所用标本须经超薄切片
在观察光的干涉现象的实验中将两片刀片合在一起在涂有墨汗的玻璃片上划出不同间隙的双缝按图所示的方法让激
如图5所示的双缝干涉实验用绿光照射单缝S.时在光屏P.上观察到干涉条纹.要得到相邻条纹间距更大的干涉
增大S
1
与S
2
的间距
减小双缝屏到光屏的距离
将绿光换为红光
将绿光换为紫光
下列现象中属于光的衍射的是
雨后天空出现彩虹
通过一个狭缝观察日光灯可看到彩色条纹
海市蜃楼现象
日光照射在肥皂膜上出现彩色条纹
在观察光的双缝干涉现象的实验中①将激光束照在如图所示的双缝上在光屏上观察到的现象是下图中的A.②换用
单色光源发出的光经一狭缝照射到光屏上可观察到的图样是下列的
在观察光的双缝干涉现象的实验中1将激光束照在如图所示的双缝上在光屏上观察到的现象是下图中的2换用间隙
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Ifyou'replanninganItalianvacationthereisawealthofinformationonlinethatyoucanaccessforfree.FindoutwheretogoandwhattoseewithanItalyblog. YounginRome Thisisagreatsitefortheyoungertravelers.Itscontentisprovidedbylocals.YounginRomemostlycentersonthingstodoandsee.Artexhibitionseventsandconcertstakeupmostofthefocus.ThereisalsoadailywordofthedaypostwhichwillhelpyouexpandyourItalianvocabulary. FodorsTravelBlog YoucanbenefitfromsomegreattipsfromFodorsTravelBlog.AwidevarietyofdestinationsarecoveredincludingItaly.CheckoutgreatpoststohelpyoufigureoutwhattodoandwhatnottodoinItaly.Ifyou'revisitingotherdestinationsinEuropethisisaveryhelpfulresource. ItalyBeyondtheObvious Thisisablogfortravelerswhowanttostayoffthebeatenpath.YouseemoreofthecultureofItalybykeepingclearorpopulartouristdestinations.TherearedescriptionsofWalkingandbikingsuggestions. SelectItalyBlog ThesiteoffersadviceonEuropeantravel.Therearealsopostsabouteventsandexhibitionsinthecountry.Thisisacompanyblogforatravelbusinesssoitalsooffersservices.Howeveryoudon'tneedtouseitsservicestotakeadvantageofthegreatadviceoffered. DreamtoItalyBlog ThisblogcoversnewsandcurrenteventsinItaly.YoucanfindseveraldifferentthingstodosuchastakingaclassatanItaliancookingschool.ThesitealsohasinformationonItalianrealestate房地产ifIwanttomakeyourvacationpermanent. 21.Whatisthepurposeofthispassage? A.ToencouragepeopletotourItaly. B.TogivetraveltipsforvisitingItaly. C.TointroducesomeattractionsinItaly. D.TorecommendsomeItalytravelblogs. 22.WhatdoFodorTravelBlogandSelectItalyBloghaveincommon? A.BothoffertraveladviceonEuropeantravelsincludingItaly. B.BothhaveavarietyofpostsabouteventsandexhibitionsinItaly. C.Bothhavehelpfulresourcesofferinggreattraveltipsandsevices. D.BothfocusonArtexhibitionseventsandconcertsItaly. 23.Ifyoudislikecrowdedtouristdestinationsyoumaygetusefulinformationfrom. A.DreamofItalyBlog B.YounginRome C.ItalyBeyondtheObvious D.SelectItalyBlog.
Ifyourlifefeelslikeitislackingthepowerthatyouwantandthemotivationthatyouneedsometimes61youhavetodoisshiftyourpointofview. Yourlifecanbeenhancedandyourhappiness62richwhenyou63choicetochangeyourperspective.Don't64yourfuturetochanceorwaitforthingstogetbettermysteriouslyontheirown.Youmustgointhedirectionofyourhopesandaspirations.Begintobuildyour65confidentandworkthroughproblemsratherthanavoidthem.Rememberthatpowerisnot66necessarytocontroloversituationsbutthe67abletodealwithwhatevercomesyourway. Alwaysbelievethatgoodthingsarepossibleandrememberthatmistakescanbelessonsthatleadto68discover.Takeyourfearandtransformitintotrust;learntoriseaboveanxietyanddoubt.Turnyourworryhoursintoproductivehours.Taketheenergythatyouhavewastedanddirectittowardeveryworthwhileeffortthatyoucanbeinvolvedin. Youwillseebeautifulthingshappenwhenyouallow69toexperiencethejoysoflife.Youwillfindhappinesswhenyouadoptpositivethinkingintoyourdailyroutineandmake70animportantpartofyourworld.
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Sevenyearsagobackin2010somereportscoveredastorythattheworld'slongestrailwaytunnelwasunderconstructioninSwitzerland.Atthatpointithadalreadybeenunderconstructionforoveradecade.Ithadbeenvotedtobebuiltnearlyaquarterofacenturyago!Theideatobuilditcoulddatebacktonearly70yearsago﹣aboutasoldassomeofyourgrandparents! Yesterdayitwasfinallyready! It's35mileslongandruns7500feetbeneaththeSwissAlpsafamousmountainrangeinSwitzerland.Itevenrunsunderanoldtunnelthatwastherebefore.Ittookatotalof17yearstobuildatacostof$12billion128milliontonsofrockweredug.Twomilliontruckloadsofearthwereremoved! ThetunnelconnectsnorthernandsouthernEurope.TheopeningofthistunnelwassuchabigdealthattheGermany'sleaderChancellorAngelaMerkelFrance'spresidentFrancoisHollandeandItaly'sprimeministerMatteoRenziwerealltheretocelebrateaswasAustria'schancellorChristianKern. It'scalledtheGotthardBaseTunnel.Eventually325freightandpassengertrainswillgothroughthetunnelrelievingalotoftrafficontheroadwaysthereandmakingitamoreenvironmentallyfriendlyoption.TheGotthardBaseTunnelisawonderofengineering!Makeuswanttovisitit! 24.WhendidpeoplefirsthavetheideaofbuildingtheTunnel? A.About70yearsago. B.Halfacenturyago. C.Twentyfiveyearsago. D.Sevenyearsago. 25.WhatcanwelearnabouttheTunnel? A.Itusedtobeanoldtunnel. B.Ithasjustbeencompleted. C.ItconnectsallEuropeancountries. D.Itrunsoverarangeofmountains. 26.WhatmaybethepurposeofbuildingtheTunnel? A.Toimprovetraffic. B.Toincreaseemployment. C.Toattractdonation. D.Tostoppollution. 27.WhatcanbeinferredabouttheTunnel? A.Itwillcauseconflictsamongcountries. B.Itwillbeoflittlebenefittothelocals. C.Itmaydodamagetotheenvironment. D.Itmaybecomeatouristattraction.
下列抛物线有最高点还是最低点写出这些点的坐标抛物线y=-4x²+3x有最填高或低点该点的坐标是
WheretoDrink CafeSanBernardo Jointable﹣tennisandpool﹣playingport.CafeSanBernardohasbeenrunningsince1912.TheVillaCrespodivebaralsooffersuptablefootballfor￡4anhour.Serviceisefficient;withlastordersat5am.Thedailyhappyhourbetween6pmand9pmincludes60minutesplayingyourgameofchoiceplusahalf﹣bottleofredwineandacornpiefor￡9. ●AvenueCorrientes5436VillaCrespo541148053956cafesanbernardo.com MSalumeria&Enoteca Tradingonlyinwinewithastorysommelier侍酒师MarianaTortachoosesnewwaysonadailybasisandkeepsalistofaround250labels.There'snowinemenu﹣simplytakeyourbottlefromtheshelf. ●Open11:00am﹣11:30pmElSalvador5777PalermoHollywood541147789016onFacebook NegroCuevadeCafe CoffeehasfounditsplaceinBuenosAires.WhileLAB:TostadoresTheShelterandCoffeeTownarefamousnewplacesNegroCuevadeCafeisoneofthebestdowntown.ItservesEcuadorianColombianandBrazilianbeansanditsattractingcakesincludecroissant. ●Open9:30am﹣7:00pmSuipacha637Microcentro541143223000negrocuevadecafe.com LaCalle HeadtotheNicetoVegaaddressandyou'llbefacedwithapizza.Don'tworryit'stherightplace.LaGuitarritaisthefronttohiddenbarLaCalle.Orderthehousecocktailspecialcandyandpreparetosinguntildawnwithahigh﹣energyyoungcrowd. ●Open8:00pm﹣2:00amNicetoVega4942PalermoSoho541139141972onFacebook 21.Whichnumbershouldyoucallifyouwanttodosomesports? A.541147789016. B.541148553956. C.541143223000. D.541139141972. 22.WhencanyougotoMSalumeria&Enoteca? A.Allday. B.1:00am. C.3:00pm. D.10:00am. 23.WhatmakesLaCalledifferent? AItshavingspecialcandy. B.Itshavingnowinemenu. C.Itsallowingyoutoplaygames. D.Itsopeningforthelongesttime. 24.Whatlstheauthor'spurposeinwritingthetext? A.Toshowwineculture. B.Tointroducesomewinebars. C.Tohelppeoplechoosedrinks. D.Toshowhowtoenjoyyourself.
已知两个正数的和是60它们的积最大是多少提示设其中的一个正数为x将它们的积表示为x的函数
HowtoSleepBetter Ifyou'rehavingtroublegettinggoodsleepthroughthenightturningwakingupmorethanonceforexamplethistextwilltellyouwhatyoucandotoensureapeacefulnight'ssleep. 1.Getonschedule.Changingyoursleepingtimebymorethananhourcanseverelydisturbyoursleepquality.36Forexampleifyounormallywakeupat6amonweekdaystogettoworkyoumightgotobedaround10pmbecausethat'swhenyoustarttofeelsleepyandit'salsoagoodtimetoensure8hoursofsleep.Ifontheweekendyousleepuntil9amyouprobablywon'tbeabletofallasleepthatnightuntilIam. 2.Bemindfulofwhatyoueatordrinkbeforebed.37Digestionslowsdownwhileasleepandafullstomachmayinterruptsleep.Similarlyyoushouldavoidgoingtobedonanemptystomachasacompletelyemptystomachmayequallydisturbyoursleepingpatterns. 3.38Exposuretolightduringthetimewhenyou'resupposedtobesleepingcandestroyyourbody'sinternalclock.Turnyourlightofforuseaverydim暗淡的nightlight.39TheyincludewindowsLEDclocksandcomputerlights. 4.Changeyoursleepingposition.Youmaythinkthatit'simpossibletocontrolwhatpositionyousleepinsinceyouaren'tfullyawareofwhatyouaredoingbutitispossibleanditcanmakeaconsiderabledifference.40 A.Trytoavoidallsourcesoflight. B.Keeptheroomasdarkaspossible. C.Makenoteofunusualcircumstances. D.Waitatleastthreehoursafterdinnerbeforegoingtosleep. E.Sleepisconsideredtobeadequateonlywhenthereisnodaytimesleepiness. F.Inotherwordssuddenchangeofsleepingtimewillaffectyourbiologicalclock. G.Ifyouwakeupinthemiddleofthenightmakeanefforttohaveacomfortableposition.
求下列函数的最大值或最小值．y=1﹣2x﹣x2．
SCIENTISTSstudyit;anincreasingnumberofself﹣helpbookstellusthewaytofindit.InfactthepursuitofhappinesshasbeencalledtheultimategoalinlifebycountlesstalksTVshowsandnewspaperandmagazinecolumns.Howeverhappinessasitwasbeforeisstillhardtofind. USpsychologistEdDienerauthorofHappiness:UnlockingtheMysteriesofPsychologicalWealthmayhavetheanswer:acombinationoflifesatisfactionandhavingmorepositivethannegativeemotions.Howeverthismaysoundstraightforwardenoughbutitstilldoesn'texplainwhatdeterminespeople'shappiness.AndasTheWashingtonPostarguedinanarticleearlierthismonthcreatingadefinitionofhappinessthatistrueforpeoplearoundtheworldcanseemasdifficultasbeinghappy.Forexamplewhoishappier:someonewhohasenoughmoneytobuyanewmobilephoneorsomeonewhohasafamilydinnerafteryearsawayfromhome? Neverthelessasmanysurveyssuggestoneofthemostimportantpartsofhappinessiswealth.TheUN'sWorldHappinessReport2015showsthatcountrieswiththehighestlevelsofhappinessaredevelopedoneswithSwitzerlandIcelandandDenmarkmakingupthetopthree.ButontheotherhandBhutanoneofthepoorestcountriesintheworldwasnamedthehappiestcountryinAsiaandtheeighthhappiestintheworldinresearchbyBusinessWeekin2012. Perhapsthebiggestproblemishowtheideaofhappinessvariesindifferentculturesandlanguages. AsTheWashingtonPostnotedthewordhappycanrefertodifferentthingsinEnglish.Itmightmeanabriefmoodyoufeelwhensomeonesurprisesyouwithagiftoryouthinkoffriendsandfamily.Oritcouldrefertosatisfactionwithyourlife.Butnotalllanguagesrefertohappinessthesameway.InDanishforexamplehappinessisoftentranslatedaslykkeatermthatcandescribeeverydaywell﹣beingthatmightcomefromanicecupofcoffeeorasliceofbreadwithcheese.InChinesethewordforhappinessisxingfuwhichisusedtodescribeagoodlifeandalifewithmeaning.Foragoodmoodhoweverkuaileisusedmoreoften. AnotherdifferenceintheperceptionofhappinessasTheWashingtonPostputitisthatWesterncountriestendtohavequiteanindividualisticviewofhumanlife.InChinaandmanyotherAsiancountriessocialrelationshipswithfamilyinparticularareoneofthemostimportantfactorsinaperson'swell﹣being. Soareyouhappy?Andwhatmakesyouhappy? 32.WhatdoeshappinessinChinesemeanaccordingtothearticle? A.Individualisticviewofhumanlife. B.Everydaywell﹣being. C.Acombinationofsatisfaction. D.Agoodlifewithmeaning. 33.HowdoChinesepeopleandpeoplefromWesterncountriesviewhappinessdifferently? A.WealthisregardedasthemostimportantsourceofhappinessinWesterncountries. B.Socialinteractionplaysamoreimportantroleinaperson'swell﹣beinginWesterncountriesthaninChina. C.Familybondsarebelievedtobecloselyconnectedtoaperson'swell﹣beinginChina. D.ChinesepeoplegetmorehappinessfromtheirpersonalachievementsthanpeoplefromWesterncountriesdo. 34.Howisthearticlemainlydeveloped? A.Bygivingexamples. B.Byanalyzingcauseandeffect. C.Byfollowingtheorderoftime. D.Byaskingandansweringquestions. 35.Whichoneistrueaccordingtothearticle? A.Itishardertofindhappinessthanever. B.Alllanguagesdon'tlookathappinessinthesameway. C.It'ssafetosaythathappinessliesinwealth. D.It'snothardtogiveauniversaldefinitionofhappinessacrosstheworld.
TeathemosttypicalEnglishdrinkbecameestablishedinBritainbecauseoftheinfluenceofaforeignprincessCatherineofBraganzathequeenofCharlesII.AsaloverofteasinceherchildhoodinPortugalshebroughttea﹣drinkingtotheEnglishroyalcourtandsetatrendforthebeverageinthe17thcentury.ThefashionsoonspreadbeyondthecircleofthenobilitytothemiddleclassesandteabecameapopulardrinkattheLondoncoffeehouseswherepeoplemettodobusinessanddiscusseventsoftheday.ManyemployersservedacupofteatotheirworkersinthemiddleofthemorningthusinventingalastingBritishinstitutiontheteabreak.HoweverdrinkingteainsocialsettingsoutsidetheworkplacewasbeyondthemeansofthemajorityofBritishpeople.Itcamewithahighpricetagandteawastaxedaswell. Around1800theseventhDuchessofBedfordAnneMariabeganthepopularpractice ofafternoonteaaceremonytakingplaceataboutfouro'clock.Untilthenpeopledidnot usuallyeatordrinkanythingbetweenlunchanddinner.Atapproximatelythesametimethe EarlofSandwichpopularizedanewwayofeatingbread﹣inthinsliceswithsomethinglikejamorcucumbersbetweenthem.BeforelongasmallmealattheendoftheafternooninvolvingteaandsandwicheshadbecomepartoftheBritishwayoflife. Asteabecamemuchcheaperduringthe19thcenturyitspopularityspreadrightthroughallcornersoftheBritishsociety.ThusteabecameBritain'sfavoritedrink.Inworking﹣classhouseholdsitwasservedwiththemainmealofthedayeatenwhenworkersreturnedhomeafteraday'slabor.Thismealhasbecomeknownashightea.Todayteacanbedrunkatanytimeofthedayandaccountsforovertwo﹣fifthsofalldrinksconsumedinBritain﹣withtheexceptionofwater. 1Whatismainlydiscussedaboutteainthetext? A.ItsdevelopmentinBritain. B.Itstraditionalwaysofdrinking. C.Itsinfluencearoundtheworld. D.ItspopularityinEurope. 2Whatdoestheunderlinedwordsthebeverageprobablyreferto? A.Teadrinking. B.Asmallmeal. C.Awayofeatingbread. D.Achoiceofdrinks. 3WhywasteaunabletobeacceptedasacommondrinkinBritaininthe17thcentury? A.ItwasmerelyservedinLondon. B.Itwastaxedasanalcoholicdrink. C.Itwasforbiddeninbusinesssettings. D.Itwastooexpensiveformostpeople. 4Howisthetextorganized? A.Bycauseandeffect. B.Bycomparison. C.Intimeorder. D.Infrequencyorder.
你的美国朋友Rose要来中国参加汉语演讲比赛.她对比赛感到非常紧张特意发来电子邮件向你求助.请据此并结合下面的写作提示给她回一封信. 要点:1.赛前如何准备; 2.比赛中的注意事项; 3.祝她好运. DearRose Yourssincerely LiHua.
第一节短文改错 假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下画一横线并在该词下面写出修改后的词. 注意: 1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. StudyingintheUKhavebeenagoodexperienceforme.WhenIfirstarrived.IfindlifeveryhardasIdidn'tknowanybodyhere.butIsoongottoknowotherChinesestudentattheuniversity.LaterIbecameinterestingincommunicatingwithpeoplefromvariousculturesandImadefewerfriends. Duringmystudy.Ichosetoliveinwithmyclassmatesinthedormitory.Ithinkit'sbetterthanlivinginBritishfamilybecauseIcanmeetpeoplefromdifferentcountrieseasy.Thecourseshereareexcellent.Ienjoythewaytheteachersgivelessons.WeareencouragedtothinkforyourselveswhichisquitedifferentfromthatIhaveexperiencedbefore.
用长为6m的铝合金型材做一个形状如图所示的矩形窗框窗框的高与宽各为多少时才能使它的透光面积最大最大透光面积是多少铝合金型材宽度不计
右图为某学生进行粗盐提纯实验时过滤操作的示意图．试回答1写出标号仪器的名称①②．2溶解时玻璃棒的作用是．3制作过滤器时滤纸边缘应并紧贴在漏斗内壁上中间不能留有气泡玻璃棒靠在．4过滤时玻璃棒的作用5过滤后滤液仍然浑浊可能的原因是只写一条 接下来如何操作．6蒸发滤液时用玻璃棒不断搅拌滤液的目的是等到蒸发皿中出现时停止加热利用蒸发阻的余热使滤液蒸干．移去蒸发皿时应使用的仪器是．
DearCarolyn MysisterstepandIgetalonggreat…aslongasourparentsaren'taround.Whenmymomandherdadaretheresheismeaneasilyoffendedeasilyoffensiveandit'sawful. We'vebeentalkingaboutplanningavacationforallofuswithmyyoungsontoDisneyWorldandit'salreadygottencontentious矛盾的.AverylargepartofmewantstosuggestthatwebreakthisupandjustgotoDisneywithmemysisterandmyson.ButifmyparentsgotheywillpayandIcan'treallyaffordtogoonmyown.MysistercoulddefinitelyaffordtopayforallofusbutIdon'tthinkIshouldaskforthat. Anyadvice?ThisissosoobviouslyabadideabutIdon'tknowhowtopullthisoff设法做成withoutlotsofhurtfeelings.IguessIcanjustgowithitandputupwiththeangerinexchangeforafreetriptoDisney?Ugh. ********************************************************************************** Familyvacationdisaster ThemostobviousOption1istobackoutofthetrip.Sayyou'renotcomfortablebeingpaidforandwouldliketopostponeuntilyoucansaveupforit. Option2istobemorestraightforwardwithyoursister:Idon'tknowifyou'venoticedthesamethingbutweseemtogetalongbetterwhentheparentsaren'taround.Butyouhavetobecarefulnottolaytheblameonher. Option3istogoonthetripasplannedbutwithadifferentattitudetowardyoursister.Someonewhoactsthewayyoudescribeisobviouslystressed.Canyouthinkofwhy?Canyoufindempathy感同身受;同感;共鸣? Canyouhelp?Ormaybejustcanyougetawaywhenitgetsbad? EvenifyougowithOption1or3fileaway2foranothertimetheunderlyingtensionbetweenyouthatspoilsyourtimewithyourparentsmustbeaddressed. 25.Fromthefirstletteritcanbeconcludedthatthewriterofthefirstletter. A.can'taffordtogoforatriptoDisneyalone B.isgoingtogoonavacationwithhersister C.hasgreatfunwithherparents D.willgotoDisneywithouthersister 26.FromthesecondletterwelearnthatFamilyvacationdisaster. A.shouldcancelthetripimmediatelyunlessshemakeupwithherparents B.shouldblamehersisterfornotgoingforthetrip C.shouldknowthathersisterisunderstressinfrontoftheirparents D.shouldfindempathywithherparents 27.WhatdoweknowaboutCarolyn? A.CarolynistheonewhowantstogoonatriptoDisney. B.Carolynisacolumnwriterwhohelpspeopleintrouble. C.Carolynisapersonwhoreceiveletter. D.CarolynisaworkerinDisney.
求下列函数的最大值或最小值y=100-5x²
Antsaretroublesomebestknownforitchybitesandruiningpicnics.ButanewspeciesofcrazyantistakingoverTexas.Insomewaystheyappeartobeworsethanfireantsandthere'snogoodwaytostopthem.Theseantsmovefastandareplentifulinsomeareas. ThecrazyantsfirstspranginPearlandin2002andhavebeenbecomingmoreandmoreofaproblemeversince.Aninvasionofthesecanbesoextremethatit'shardtocallitjustanuisanceUniversityofTexasentomologistEdwardLeBruntoldTheAustinAmerican﹣Statesman.Theantshavebeenknowntocrawlintoandruintelevisionsappliancesandotherelectronicdevices.NooneisentirelysurewhyHesaid. DavidOiaresearchentomologistattheDepartmentofAgriculturetoldTheNewYorkTimesin2013thestrangeideathattheantsareactuallyattractedtotheelectricityitselfcan'tberuledout. ThecrazyantsorRaspberryants﹣yepthat'sactuallywhattheyarecalled﹣arefoundin23Texascounties.Theantshaveverylittlevenom毒液butdocauseaslightstingwhentheybite.Mostlythoughthey'reahazardtoelectricalequipment. Theyarearelativelynewspeciesintheregionandlittleisknownabouthowtocontrolorkillthepopulation.Andunfortunatelytheredoesn'tseemtobemuchthatcanbedoneaboutthemrightnow.Soforthemomentthebestadviceisnottostayclosetoantpilesandgroupsandhopethatnonemakeitinsidetocrawlaroundtheelectronics. 28.WhatdotheantsdoinTexas? A.Bitesomepeople. B.Damagelocalcrops. C.Destroyappliances. D.Polluteenvironment. 29.TheunderlinedwordnuisanceinParagraph2isclosestinmeaningto. A.story B.visit C.problem D.failure 30.Whenmeetingwithantpileswe'dbetter. A.killthemall B.controlthem C.drivethemaway D.stayawayfromthem 31.Whatcanweknowfromthetext? A.ThecrazyantsfirstappearedinTexasin2013. B.ThecrazyantscausehugetosstothepeopleinTexas. C.Thegovernmentistakingmeasurestodealwiththeant. D.DavidOiissurewhytheantsruinelectronicdevices.
求下列函数的最大值或最小值．y=-6x2+12x．
Andrewwasgoingforasalesjobinterview.Heknewhehadthe61littleexperiencetogetthejob.Infacthewasn'tevensurehowhe'dgottheinterview.62hedidknowwasthathewasverythankfulfortheopportunitygiventohim. Thoughtheinterview63gowellitwasimpressedonhimagainthat64comparewiththeothercandidateshedidn'thavetheabilitytogetthejob.Asheleftthebuildinghegavethereceptionist65envelope.Insidewasathank﹣younotefortheman66hadjustinterviewedhimthankinghimforhistimeandfortheopportunity. ThateveningAndrewgotacall67tellhimthathe'dgotthejob.Hisnewemployerknew68clearthatitwasn'tAndrew'squalificationsthatgothimthejobbuthisthank﹣younote.IfAndrewwasabletobethankfulatthisstagehewouldbeabletobuildpositiverelationshipswithhis69customerwhichwasexactlywhatthecompanywaslooking70.BeinggratefulwonAndrewthejob.
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短文.短文中共有10处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∧并在此符号下面写出该加的词. 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. LastSundayIwenttothemarketwithmymothertobuysomefreshlyvegetables.Mymotherspentalongtimebargainingbeforeshepaidforvegetablesshehadchosen.Shewantedtogetitatthelowestpricebecauseofshethoughtshecouldsavesomemoneyinthisway.Beforecomingbackshecookedsuchmanydishesthatwecouldn'teatthemall.Sowehadtothrowsomefoodsaway.Asaresultthemoneywewastedwasmuchthanthatsavedfrombargaining.Icouldn'thelpfeelconcerned.Ithinkthebestwaytosavemoneywastostopwasting.
下列抛物线有最高点还是最低点写出这些点的坐标抛物线y=4x²-4x+1有最填高或低点该点的坐标是
第一节完形填空 Ispentlastsummervolunteeringatahospital.Itwasagiftto41somanyamazingpeopleandI'dliketoshareoneofthesemoments.OnedayIwascalledtoaroomwherean42womanwasstaying.UsuallyIhelpedwith43whowerereadytoleave.Insteadshe44togotothegiftshop.Igota45helpedherintoitandheadeddowntotheentrance. Whenwegotthereitwasn'topenyet.Aftera30﹣minute46weenteredthegiftshop.AsIpushedheraroundIcouldseethe47inherfaceasshelookedateverythinghappytobeoutofherroom.She48somewindowdecorationsandthensawchocolates. Sheaskedmetopushherinthat49andthenIhelpedher50allthedifferentchocolatearrangements.51shedecidedonthreedifferentboxes. Shetoldmetowritethenumbers12and3ontheboxes.She52thatthenursesweretakingsuchgoodcareofhersoshe53chocolatesforeachofthethreeshiftsofnurses.Aswegavethecurrentshiftofnursestheirboxofchocolatethey54offeredsometomebeforetakingsomethemselves. Therewere55allaround.Witnessingtheoldlady's56andgettingtheopportunitytospendtimewithsomeonewhogotsomuchjoyfromlifewasa57initself.Ihavesomanymorestoriesandeachpersonmadeanimpactonmylife.I've58thathealthhasawayofbringingpeopletogether.59isablessingandbeinginaplacewherehealthisso60andappreciatedisunlikeanythingelse. 41.A.introduce B.meet C.attract D.describe 42.A.elderly B.strange C.important D.famous 43.A.nurses B.kids C.patients D.parents 44.A.pretended B.wanted C.failed D.promised 45.A.car B.shoppingcart C.wheelchair D.bike 46.A.ride B.walk C.drive D.wait 47.A.relief B.anxiety C.joy D.puzzle 48.A.chose B.made C.used D.received 49.A.manner B.case C.direction D.point 50.A.preparefor B.makeup C.figureout D.1ookthrough 51.A.Suddenly B.Eventually C.Fortunately D.Actually 52.A.explained B.declared C.expected D.imagined 53.A.exchanged B.designed C.tasted D.bought 54.A.infact B.ataloss C.inturn D.atease 55.A.whispers B.smiles C.shouts D.cheers 56.A.kindness B.choice C.decision D.1oneliness 57.A.1esson B.chance C.gift D.fact 58.A.concluded B.imagined C.predicted D.1earned 59.A.Health B.Luck C.Virtue D.Praise 60.A.tested B.valued C.maintained D.promoted
Peoplewhoseemtohavealltheluckarenotusuallyblessedbyalargeamountofgoodfortune.Theysimplyhaveahealthyattitudewhichenablesthemtomakethemostofsituations.Herearesometipsforcreatingyourownluck. 1.BeGratefulForWhatYouHave. Somepeoplearealreadyluckyandtheyjustdon'knowit.36Forexampleyouhaveahappyfamilysomewonderfulfriendsaroofoveryourheadandfoodonthetable.Byacknowledgingthesethingsregularlyyoucaninstantlyfeelluckier. 2.SeetheGoodinthePast Peoplesometimescomplainabouttheirpastforholdingthemback.Theyblametheirparentsortheirschoolingfornotsettingthemupforsuccess.Buthavingadifficultlifedevelopsstrengthsandqualitiesyoumightneverhavegotifyouhadn'tbeenthroughthosetoughsituations.37 3.BeGenerous Ifyouwantpeopletogiveyouopportunitiesyouhavetoconsiderwhatyoucandoforothers.38Begenerouswithyourtimeandattentionandyou'llbesurprisedhowmanyluckyopportunitiespeoplemayofferyou. 4.BeOpentoNewthings Luckdoesn'tjusthappenuponus﹣itcomestouswhenwe'reopen.39LearningnewskillsvisitinganewplaceortryingaDewhobbyareallgreatwaysofexpandingyouropportunitiesandyourmindset. 5.TakeAction 40Takestepstowardsyourgoalsanddreamsandgreeteverychallengewithapositivemindset.Youwillfindyoucreatemoreluckineverydaylife. A.Youcannotexpecttoreceiveifyounevergive. B.Sobegratefulforthegoodthatcamefromyourpast. C.Manypeoplespendtimethinkingaboutwhattheydon'thave. D.You'llnevercreateanyluckifyousittherewaitingforittocome. E.Tryingsomethingnewisagreatwayofgettingmoreopportunities. F.Butoftensuccesscomesfromgreatdeterminationratherthangoodluck. G.Lookathowluckyyoualreadyareinsteadoffocusingonwhat'slacking.
Thetermhelicopterparentsreferstoastyleofparentswhoareoverfocusedontheirchildren. Helicopterparentsarealwaysmakingabigpushtoprovidechildrenwitheveryopportunitytosucceedfrombabystepsatage1homeworkatage8collegeapplicationatage18employmentissuesatage25tofamilyproblemsatage3040orevenolder.Theyconstantlyshadowthechildalwaysdirectinghisbehaviorallowinghimzeroalonetime. Helicopterparentingcandevelopforanumberofreasons.Worriesabouttheeconomythejobmarketandtheworldingeneralcanpushparentstowardtakingmorecontrolovertheirchild'slifeinanattempttoprotectthem.Adultswhofeltunlovedorignoredaschildrencanovercompensatewiththeirownchildren.Whenparentsseeotheroverinvolvedparentsitcancauseasimilarresponse.Theyfeelthatiftheydon'tinvolvethemselvesintheirchildren'slivestheyarebadparents. Themainproblemwithhelicopterparentingisthatitcanbackfire.TogiveanexamplethehousewhereMarylivedwithroommateswasbrokenintoandthingswerestolen.Marycalledthelandlord房东toinstallanalarmsystembutbeforeshecouldfinishthenegotiations协商hermotherrushedinanddemandedaction.Ifeltlikemymotherruinedmycommunicationwithourlandlord.Wecouldhavegottenitdoneourselves.ShewaswellintendedbutonlymademefeelannoyedanddefeatedsaysMary. Obviouslyoverparentingismotivatedwiththeideaofdoinggoodthingsbutitdoestheexactopposite.Inthelongrunparentsareactuallydamagingtheirchild'sbasicskillstodealwithmattersindependently.Itmakesthechildfeellackinginconfidencelesscompetentindealingwiththestressesoflifeontheirown.They'rewinningthebattlebutactuallylosingthewar. 29.What'sthepurposeofhelicopterparents'overparenting? A.Todosomethinggoodfortheirchildren. B.Tomaketheirchildrennotignored. C.Tohelptheirchildrenfindagoodjob. D.Togetridofthepressurefromotherparents. 30.Whatcanwelearnfromthepassage? A.Childrenwhohavehelicopterparentsliveahardlife. B.Helicopterparentingonlyhappenstoveryyoungchildren. C.Helicopterparentscanprotecttheirchildrenagainstallproblems. D.Helicopterparentsdotheirchildrengreatharminthelongrun. 31.Whatwillpossiblybediscussedintheparagraphthatfollows? A.Thebadeffectsofhelicopterparenting. B.Howwecanavoidbeinghelicopterparents. C.Differentopinionsabouthelicopterparenting. D.Thereasonsforthedevelopmentofhelicopterparents. 32.Whatistheauthor'sattitudetowardshelicopterparenting? A.Uninterested. B.Objective. C.Positive. D.Disapproving.
MymotherandIneverhadoneofthosenicedressinmatchingmother﹣daughterclothesrelationships.Intheconfuseduncertainmindofateenagerthis41toShedoesn'tcareunderstandorloveme.42Iwasquitesurethatshehadnoideawhatlovewasreallyallabout.43shewasmoppingthefloorscookingmealsandraisingfivechildrenIwaslisteningtothemusicreadingpoetryandexperiencingthe44oflove. Asthewinterofmysixteenyear45thetensionbetweenusgrew.LookingbacknowIrealizethatItookeveryopportunitytolashoutat抨击herinan46tolessenmyowninsecurity.AndthatisexactlywhatIdidwhensheunpackedthatoldgreencoatofhers.Well﹣wornand47IdirectlytoldherthatIcouldnotbelieveshewould48itforanotherseason.ShebegantosaysomethingaboutnothavingthemoneyforanewcoatbutIwasalreadysayingphraseslikeWhenIamolderIwillhaveabeautifulandrich﹣lookingcoat.Iwouldn'tbe49deadwearingaraglikethat. Christmasmorningwasalwaysan50timeinourhouseandthatyearwasnoexception.Thesoundoflaughterkidsyellingandpaperrippingfilledthelivingroom.ThoughItriedtokeepcalmIwas51toseewhatSantahadbrought.Onelargebrightlywrappedboxwithmyname52myattention.Iquicklytoreitopen.InsidewasthemostbeautifulIhadeverseen.Brownsuede绒面革大衣withawhitefurcollaritwasnicerthananythingIhad53dreamtofowning. LookingupIcaughtmymother's54.IthoughtoftheoldgreencoatandinstantlyI55howpreciousthisgiftreallywas.Mymotherknewwhatacoatlikethiswouldmeantomeandshewaswillingto56heroldcoatsothatIcouldhaveit.Hereyesgleamedwithjoyasifitwereshewhohadreceivedtheverybestgift.57thetruemeaningoflovewascleartome. IwishIcouldtellyouourrelationship58changedintoalovingandgivingoneafterthatdaybutthatonlyhappensinthemovies.Westillfoughtandfound59witheachotherbutIalways60aspecialplaceinmyheartwhereIlovedherandIknewthatshelovedme. 41.A.translated B.handed C.awarded D.brought 42.A.Really B.Actually C.Obviously D.Slightly 43.A.Although B.Once C.If D.While 44.A.excitement B.disappointment C.surprise D.satisfaction 45.A.approached B.advanced C.changed D.left 46.A.effect B.effort C.order D.experiment 47.A.outoforder B.outofplace C.outoftime D.outofstyle 48.A.keep B.choose C.wear D.remain 49.A.grasped B.seized C.caught D.held 50.A.satisfactory B.thrilling C.moving D.astonishing 51.A.concerned B.upset C.worried D.anxious 52.A.pushed B.pulled C.drew D.paid 53.A.already B.ever C.even D.still 54.A.eyes B.attention C.head D.coat 55.A.thought B.realized C.admitted D.spotted 56.A.getawaywith B.comeupwith C.makedowith D.catchupwith 57.A.Suddenly B.Finally C.Clearly D.Indeed 58.A.terribly B.beautifully C.wonderfully D.magically 59.A.proof B.mistake C.error D.fault 60.A.carried B.settled C.held D.stayed
假设你是红星中学高三1班学生李华.在高考前剩下的日子里你的朋友Peter想了解你的计划请你给他写一封回信.信的内容包括: 1.你的计划和愿望是什么? 2.你打算如何实现你的愿望. 注意: 1.词数100左右; 2.可以适当增加细节以便行文连贯; 3.短文中不能出现与本人相关的信息. DearPeter Yours LiHua.
ThereareprobablynopeopleonEarthwholiketogossipasmuchastheBritish.Ifpryinginto打探other'sliveswereanOlympicsportthenTeamGBwouldsurelytakethegoldmedal. AndwhentheBritishcan'twatchthelivesofrealpeopletheyhaveanothersourceofentertainmenttofallbackon﹣thesoapopera.BritishsoapoperasareverydifferentfromUSTVdramas.Foronetheyarenormallylongerrunning.ThetwomostpopularCoronationStreetandEast﹣endershavebeenrunningfor48and24yearsrespectively.Botharebroadcastseveraltimesaweeksoremarkablytherehavebeenmorethan7000episodesofCoronationStreet. ThemostobviousdifferenceisthatunlikeUSdramastheBritishsoapoperasfocusontherealworld.Thereislittleglamour魅力thestarsarerarelyrichandtheynormallyhaveboringjobs.Perhapstheappealisthatthelivesofthecharactersoftenmirrorthelivesoftheaudience﹣butwithsomedramaadded.Thismeanstheviewercanrelatetothecharactersandfeelthepainandhappinesstheygothroughontheshow. BecausethesesoapoperaslastfordecadesthecastiseverchangingTheshowsrarelyfocusononeortwomaincharacters.Liketherealworldpeoplecomeandgoallthetime.Howeverthereareexceptions.Street'swilliamRoach76hasplayedtheroleofKenBarlowsincetheveryfirstepisodeoftheshowin1960andheisstillaregular. Thechoiceofwhichsoapoperayoufollowisoftencultural:PeoplefromthenorthofBritishtendtowatchCoronationStreetasitissetinManchester.PeoplefromthesouthgenerallypreferEast﹣enderswhichissetintheeastofLondon.Theshowisgenerallyconsideredgrittierandisaimedatayoungeraudience. 28.WhatisthemaindifferencebetweenAmericandramasandBritishsoapoperas? A.Americandramasarelonger. B.Britishsoapoperasarelonger. C.Americandramasdealwithdangerousthings. D.Britishsoapoperasdealwithrealpeople. 29.WhydoBritishpeopleliketowatchsuchoperas? A.Theycanfindtheirownlifefromtheoperas. B.Theycanenjoytheoperasintheirfreetime. C.Theycanwatchtheoperasformanyyears. D.Theycareaboutthefateofthecharactersintheoperas. 30.Theunderlinedworldepisodesinthe2ndparagraphprobablymeans. A.plays B.pages C.issues D.parts 31.OnecharacteristicofBritishoperasisthat. A.thecharactersplaythesameroleforalongtime B.thecharactersintheplayoftenchange C.peopledon'tknowwhatwillhappennext D.thereisonlyoneortwocharactersinthem.
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