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如图，将图形用放大镜放大，应该属于（ ）
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如图将图形用放大镜放大应该属于
平移变换
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如图将图形用放大镜放大应该属于
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如图将图形用放大镜放大应该属于
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鉴定钻石用的标准放大镜应该是
如图将图形用放大镜放大应该属于
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小刚玩放大镜时他用放大镜观察自己的手指他看到手指正立放大的________象如图9-甲所示然后他用放
在鉴定文物时常用放大镜观察文物的细微部分这时他看到的是______实/虚像如果在文物上有两条裂纹其夹
如图用放大镜将图形放大应该属于
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钻石评价用的标准放大镜应该是的
小明同学在玩放大镜时用放大镜观察自己的手指如图4甲所示看到的是正立放大的像然后他用放大镜观察远处的房
如图将图形用放大镜放大应该属于
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如图所示在鉴定文物时考古学家常用放大镜观察文物的细微部分这时他看到的是的虚像如果在文物上有两条裂纹其
如图用放大镜将图形放大应该属于
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如图将图形用放大镜放大应该属于
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如图将图形用放大镜放大应该属于
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不属于近用助视器的是
Galieo望远镜
眼镜式助视器
立式放大镜
双合透镜放大镜
手持式放大镜
如下图用放大镜将图形放大应该属于
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如图将图形用放大镜放大应该属于
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如图将图形用放大镜放大应该属于
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如图将图形用放大镜放大应该属于
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Three﹣quartersoftheworld'scoffeefannsdestroyforesthabitattogrowcoffeeinthesunandtypicallyuseharmfulpesticides[杀虫剂andchemicalsthatpoisontheenvironment.Whenforestsdisappearmigratory迁徙的songbirdsdisappeartoo.InordertodealwithseverepopulationandhabitatlossSmithsonianscientistscreatedtheBirdFriendlycertification・ BirdFriendlycoffeesareshade﹣grownmeaningthecoffeeisplantedundertreesratherthanonthelandthathasbeenclearedofallotherplants.Coffeeexpertssayshade﹣growncoffeestastebetterbecausethebeansripenslowerthancoffeegrowninthefullsunresultinginarichermorecomplexflavor.BirdFriendlycertifiedcoffeesgrowunderbio﹣diverseshadethatprovideshabitatformigratorysongbirdsandotherwildlifestorescarbonandfightsclimatechange.BirdFriendlycoffeesarealsocertifiedorganicmeaningtheyaregrownwithoutpesticideswhichisbetterforpeopleandfortheplanet. BirdFriendlyproducerscanalsoearnmorefortheircrops.Thewoodandfruittreesonshadecoffeefarmsprovidefannerswithadditionalincome.EverycupofBirdFriendlycoffeepurchasedrewardsthesefarmerswithalittlemoremoneyforbeinggoodstewardsoflheenvironmentandencouragesthemtocontinueconservingBirdFriendlyhabitat. BuyingBiniFriendlysupportstheSmithsonianMigratoryBirdCenter'sconservationresearchaimedalunderstandingandprotectingyourfeatheredfriends.YoucanpurchaseBirdFriendlycertifiedcoffeesuroundtheworldandprotectwildlifeandhabitatwitheverycup.Findastoreorcafenearyouorbetteryethaveitshippedtoyourdoorwhenyouorderonline. 1Whatisthepresentsituationofcoffeefarms? A.Onefourthofthemhavedestroyedforesthabitatforbirds. B.Pesticidesandchemicalsusedonthempoisonedmanybirds. C.Fannershavebeenawareofenvironmentprotection. D.Scientistspayattentiontothemandhavecomeupwithanidea. 2Whit'sacharacteristicofBirdFriendlycoffees? A.Theymayhaveabettertaste. B.Theyhaveastrangeflavor. C.Theytakelesstimetoripen. D.Theyaregrownonunpollutedland. 3HowcanBirdFriendlyfannersearnmoremoney? A.Bychargingconsumersmoremoney. B.Bysellingfruitsandwoodfromtrees. C.Bycuttingdowntreesandsellingwood. D.Byservingasstewardsofcoffeeconsumers. 4Whatdocsthetextsuggestcoffeeconsumersdo? A.Consumelesscoffee. B.Ordercoffeeonline. C.Purchaseshade﹣growncoffee. D.Donatetocoffeefarmers.
Fromsmoothconferencecallsina1crowdtrainstationtolivebroadcastsoftownhallmeetingsandlightning﹣quickdownloadsofhigh﹣resolution高清晰的2movieShanghai'ssuperfast5Gnetworkisturningtechnologicaldreamsintoreality. Inthelatest3develop.thecity'sHongqiaoRailwayStationoneofAsia's4bigtrafficcentershaslauncheda5Gnetwork.Itwillallowpassengerstoexperiencedataspeedsupto100timesfasterthan5isavailablenow.Therailwaystation's5GnetworktheresultofteamingupwithtelecommunicationequipmentmakerHuaweiTechnologies6seeasamilestoneinShanghai'scommercial5Garrangementtobecomeadual﹣gigabandcitywithgigabit千兆宽带networkspeedsonmobileaswellasfixednetworks. Asthe5Gera7approachoneofthekeyconcernsfortelecomoperatorswillbehowtheycanuse5Gnetworkstomeettheneedsofhigh﹣densityareaswiththousandsofpeoplesimultaneously同时using8networktomakephonecallsaccesstheinternetandmakemobilepayments. ChinaMobile'sShanghaibranchtappedHuawei's5GDigitalIndoorSystem9iscurrentlytheindustry'sonly10commercialavailablesystemfor5Gindoorcoverage.TheproductdevelopedinShanghaiisnowreadyformassdelivery.
用图1所示的实验装置研究小车速度随时间变化的规律． 主要实步骤如下 a．安装好实验器材接通电源后让拖着纸带的小车沿长木板运动重复几次． b．选出一条点迹清晰的纸带接一个合适的点当作计时起点Ot＝0然后每隔相同的时间间隔T选取一个计数点如图2中ABCDEF……所示． c．通过测量计算可以得到在打ABCDE……点时小车的速度分别记作v1v2v3v4v5…… d．以速度v为纵轴时间t为横轴建立直角坐标系在坐标纸上描点如图3所示． 结合上述实验步骤请你完成下列任务 1在下列仪器和器材中还需要使用的有和填选项前的字母 A．电压合适的50Hz交流电源 B．电压可调的直流电源 C．刻度尺 D．秒表 E．天平含砝码 2在图3中已标出计数点ABDE对应的坐标点请在该图中标出计数点C对应的坐标点并画出v﹣t图象． 3观察v﹣t图象可以判断小车做匀变速直线运动其依据是．v﹣t图象斜率的物理意义是． 4描绘v﹣t图象前还不知道小车是否做匀变速直线运动．用平均速度表示各计数点的瞬时速度从理论上讲对△t的要求是选填“越小越好”或“与大小无关”从实验的角度看选取的△x大小与速度测量的误差选填“有关”或“无关”． 5早在16世纪末伽利略就猜想落体运动的速度应该是均匀变化的．当时只能靠滴水计时为此他设计了如图4所示的“斜面实验”反复做了上百次验证了他的猜想．请你结合匀变速直线运动的知识分析说明如何利用伽利略“斜面实验”检验小球的速度是随时间均匀变化的．
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如图所示材料相同的物体mlm2由轻绳连接在恒定拉力F的作用下沿斜面向上加速运动．轻绳拉力的大小
Haveyoueverhadasummerjob?Thosewhohavethetimetocapitaliseonthefunsummerhastooffermaynothavethefundstodoso.Thesolution?Asummerjob. Theconceptofcash﹣strapped缺钱的studentsoverthesummerperiodisnotanewone.1Vacancies空缺canrangefromrolesasordinaryasfrycooktoseasonalworkatathemeparkoracushyjobwithcomfortableconditions.Inmanycasesthejobsonlypayminimumwagewhichmayonlytideyouover.2 Summerjobsprepareyoungpeopleforsuccessfulcareersinlaterlifeteachingvital'softskills'.saysUKWorkandPensionssecretaryEsterMcVeyintheDailyMail.IndeedwhentalkingabouttheirexperiencesofsummerjobspeopleaskedforaBBCNewsarticlesaidtheygotinvaluabletrainingandlearntskillssuchaspunctualitytoleranceandtheimportanceofhardwork.3TheUKgovernmenthasplaced20000summerjobvacanciesonitsFindaJobWebsite. 4Thepercentageofyoungpeopleworkingwhilestudyinghasmorethanhalvedsince1997fallingfrom42%to18%in2014.EsterMcVeybelievesthisisbecauseyoungpeoplearechoosingtofocusmoreoneducationratherthanearningextramoney.5.Itisn'talwayseasytogetajobas20﹣year﹣oldLibertyO'HaganastudentfromWorthingfound.Nottomentionbyworkingallsummeryoumayfeelyouhavemissedoutontheexperiencesandopportunitiesyourfriendshavehad﹣travellingandhavingfun. A.Butthatisn'ttheonlyproblem. B.Asummerjobmaynotbeadreamjob. C.Thismovecomesatatimeofapparentneed. D.Theseopportunitiesarethoughttobeveryimportant. E.Butthemoneyisnottheonlythingthat'sgained. F.Andthereareopportunitiesoutthereforthosewhowanttoearn. G.summerisaheadyperiodwhereeducationstopsandfunbegins.
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Myfatherisapoliceman.Onacoldwintereveninghesawoldbeggarsittinginasquareoutsideashoppingcenter.Hisshoeshadbeenwornoutandhistoesstickout.Seehisfrozenfeetmyfatherfeltsad.Heleftandreturnedbackwithapairofnewshoesandsocksthatheboughtatanearbystore.Hekneltdownonthegroundbuthelpedtheoldhomelessmanputiton.Hisrandomactofkindnessmeltedtheheartsofthepasser﹣by.Awomanbroughtanoldblanketfromherhousetoprotectthebeggarwiththefreezingcold.Thebeggarwastouchedandsaiditwasnicetoknowthatangelstruewalkonearth.
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About6yearsagoIwasonaplanenexttoawoman・Iwastiredandwantedtotakeanap.ButbeforeIcouldgointoignorepatternshetappedmeontheshouldertointroduceherself. HimynameisHelga! WegottotalkingandeventuallyitcameupthatIhadstartedanorganizationinhighschoolcalledR.A.K.E.RandomActsofKindnessEtc..AsIdescribedwhatwedidHelgagotveryseriousandtoldmethatsheadmiredmeforthat.Shetoldmeastoryaboutthelasttimeshehadflown.ShewasonthewaytoArizonabecauseshehadgottensuddennewsthatherdad'shealthwasonthedecline.Laterherfather'sphysiciancalledtoinformherthatherdadhadrathersuddenlypassedaway.Forthe3﹣hourplanerideshesatinsilencearoundstrangers. WhenshearrivedattheairportinArizonashewalkedtothenearestwallsatdownandcriedAndhereisthepartI'llneverforgeaboutHelga'sstoiy.For2hoursshesatandweptwhilethousandswalkedtoandfrointheairport.HelgnlookedatmeandsaidHoustonnolasinglepersonstoppedandaskedifIwasokaythatduy.ItwasthatdaythatIrealizedhownnichwe!iccdeachother.ItwasthatdayIrealizedthatkindnessisn'tnormal. Kindnessisn'tnornnal.Thathasstuckwithmealltheseyearsespeciallynow.Iworkinschiwlsnationwidespeakingaboutsympathykindnessempathy同理心andlove.I'mremindedallthetimethatformanyofkindnessisnolusuallyourdefaultsetting.Wespendsomuchtimeworryingaboutourproblemsourlivesourinsecuritiesgettingtoourflightsowewalkbyorignorepeopleinneedofhelp.SoI'vemadeitmymissiontodomypartinsharingstorieswithstudentsteachersandparentsaboutourneedforcharacterantisympathy・I'malwaysbeonthelookoutforthelittleopportunitiesthatsurroundmeeverydaytodosomethingnice・ 1WhatimpressedtheauthormostaboutHelgastory? A.Helga'sanxietyoverherfather'ssuddenillness. B.HelgahadnoonetotalktoonherflighttoArizona. C.Helgawasignoredbypeoplearoundherwhenshecried. D.Helgacouldn'tgetoverhersadnessoverherfather'sdeath. 2Whichcanbestexplaintheunderlinedpartdefaultsettinginparagraph5? A.Usualwayofdoingthings B.Unexpectedwaytodothings C.Ignorancetopeoplearound D.Biggestsurprisetoothers 3Whatcanweknowabouttheauthor? A.Hestartedmanyclubsinhighschool. B.Heusedtobeaschoolteacher. C.Heteacheskidshowtobehavewell. D.Heisapromoterofagoodcause. 4Whatcanbeasuitabletitleforthetext? A.ComfortingPeopleinNeed B.MakingKindnessNormal C.IgnoringUnnecessaryTroubles D.PractisingKindnessonthePlane
下列五幅图分别对应五种说法其中正确的是
假定你是学校英语报的兼职编辑李华.最近该报开设了YourFeelings专栏column.请用英语写一篇短文介绍开设该专栏的目的交流情感专栏内容有关心理健康的文章及解答心理问题并号召同学们投稿. 注意 1.词数100左右 2.可适当增加细节以使行文连贯.
关于近代物理知识下列说法正确的是
一列简谐横波沿x轴正方向传播在t＝0和t＝0.20s时的波形分别如图中实线和虚线所示．已知该波的周期T＞0.20s．下列说法正确的是
Imagineafuturewhereallfarmingisdonebymachineandhumansneversetfootinthefields.InShropshireintheUKengineersintheHandsFreeHectareprojectaredevelopingautomatedtractorsanddronestogrowandharvestcrops.Andtheirexperimentisnotaloneagriculturalroboticsisaboomingsector行业. Onereasonwhythesectorisontheupisthatglobaldemandforfoodisrapidlyincreasing.TheWorldBankestimateswewillneedtoproduce50%morefoodby2050iftheplanet'spopulationcontinuestogrowatitscurrentspeed.Addtothistotheforecastthatyields产量willdecreasebyoveraquarterduetoclimatechangeandthesituationlooksserious.Couldfuturisticfarmingprovidetheanswer? OnecompanyinJapanbelievesso.ThefirmSpreadhasdispensedwithfarmingonlandaltogetherandinsteadgrowsvegetablesonstacksoftraysindoorsinanautomatedfactory.IncountrieslikeJapanwherelandisactuallyaveryscarceresourceitmakesmoresensetostackyourproductionjustlikeaskyscrapersaysJJPriceSpread'sglobalmarketmanager.Mr.PricetoldtheBBCthatthismethodofvertical垂直的farmingnotonlyreducescostsby50%butitisalsogreener.LEDlightscutenergybillsbyathirdand98%ofwatercanberecycled.Bygrowingcropsclosetowherepeopleconsumethemtransportcostsandemissionsarealsominimisedhesays. Andwherewillwebuythisfuturisticfood?Perhapsinshopswithnostaff?AmazonhasrecentlylauncheditsfirstAmazonGostoreintheUSwhichhasnocheckouts.Customerssimplypicktheiritemsfromtheshelvesandtechnologydoestherest. Allthisbegsthequestionifeverythingisautomatedwhatjobswillpeopledo?Themechanisationoffarmingmeansfewerandfewerpeopleworktheland.From1950to2010agriculturallabourershavedecreasedfrom81%to48.2%oftheworkforceindevelopingcountriesandfrom35%to4.2%indevelopedcountries.It'satrendthatlookssettocontinue. 1Whydopeopledevelopagriculturalrobotics? A.Tochangetheclimate. B.Toliberatetheworkforce. C.Tocontrolthepopulationgrowth. D.Tomeettheincreasingdemandforfood. 2Whichofthefollowingisclosestinmeaningtotheunderlinedwordsinparagraph3? A.changed B.developed C.doneawaywith D.takenup 3WhydoesMr.PricethinkverticalfarmingmakesparticularsenseinJapan? A.Workforceistoolimited. B.Transportcostmaydecrease. C.Thereissolittlelandavailableforfarming. D.Thetechnologyhasreachedahighlevel. 4Whatcanbethebesttitleforthetext? A.Farmingtechnology B.Thefutureoffoodproduction C.Employmenttrend D.Futureshopswithnostaff
如图甲所示质量均为m＝0.5kg的相同物块P和Q可视为质点分别静止在水平地面上AC两点P在按图乙所示随时间变化的水平力F作用下由静止开始向右运动3s末撤去力F此时P运动到B点之后继续滑行并与Q发生弹性碰撞已知BC两点间的距离为L＝3.75mPQ与地面间的动摩擦因数均为μ＝0.2取g＝10m/s2求 1P到达B点时的速度大小v及其与Q碰撞前瞬间的速度大小v1 2Q运动的时间t．
Whenmyfathermarriedmymotherin1943hegavemymothera1937crowncoinandtoldhertokeepitinthebackofherpurseandnotspendit.Thiswouldmeanthatshealwaysfeltthatshewasprotectedandwouldalwayshavemoneyifshereallyneededit. WhenIwasmarriedin1970myhusbandwhohadheardthisstoryobtaineda1937crownformeandIhavealwayskeptitinmywalletandIhavealwayshadenoughformyneeds. Afriendrecentlyfellonhardtimespartlythroughexternal外部的circumstancesandpartlythroughpoorplanning.FriendsandIhaveloanedhermoneypaidherbillsevengivenherfoodandtriedtoteachherbudgettechniquesbutnoneofthemhasbeenasolution.Shehasjustslippeddeeperanddeeperintofinancialtroubleanddepression. Lastweekshelookedpaleandunwellverydepressedandhopeless.Ithenthoughtabouthowthecrownareminderofanother'scareandlovehadprotectedmesoIwenttothebankfora﹩100dollarbill.Itoldmyfriendthestoryandaskedhertokeepthe﹩100inthebackofherwallet.Itturnedoutthatshedidn'thaveawalletsosheputthemoneyinalittlepencilcasewhereshekepthercoins.Sheimmediatelyfeltbetter.Ifeelrichandthankyouforbeingagoodfriendshesaidandwewerebothabitteary. Thereasonforpassingthisonisnottopraiseanygenerosityonmypartbuttoshowthepowerofrandomactsofkindness.IwenthomeandrememberedalittlewalletIhadthatI'dneverusedandthoughtI'llgivethattomyfriend.Iopeneditandinsidefound﹩100.Theuniverseisveryjustandifyourheartisopentherewardalwayscomes. 1Whatdidthe1937crowncoinfromtheauthor'sfathermeantohermother? A.Hisconcernforher. B.Hispityandprotectionforher. C.Hiscareandloveforher. D.Hisprideandrespectforher. 2Wheredidtheauthor'sfriendkeepthe﹩100dollar﹣bill? A.Inthebackofherwallet. B.Inalittlepencilcase. C.Inthepocketofherraincoat. D.Inthelayerofhersuitcase. 3WhatcanheinferredfromthelastParagraph? A.Theauthorbecamerichallofasudden. B.Theauthor'sfriendwouldreceiveawalletasagift. C.Theauthor'sfriendwasnottouchedbyherstory. D.Theauthorfeltuncomfortablewhenreceivingthebill. 4Whatcanbethebesttitleforthetext? A.Ahardlife B.Thehelptoafriend C.Acrowncoin D.Agiftfrommyfather
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质量均为m＝lkg的甲乙两个物体同时从同地沿同一方向做直线运动二者的动能随位移的变化图象如图所示．下列说法正确的是
如图所示电源电动势为E内阴为r．电路中的R1为光敏电阻其阻值光照强度增大而减小R2为定值电阻．当开关S闭合时下列说法正确的是
InastudyrecentlypublishedinthejournalNeuronresearchersfoundthatsupermemorizersdonthaveunusuallylargebrainregionsthatallowthemtorememberalotofinformation.1Hereareafewoftheirfavoritetricksthatcanhelpyoutorememberthingsinyoureverydaylife. ToRememberNewwords TechniqueChangeroutine Inastudyagroupofstudentsstudiedalistofwordsintwoseparatesessions.Somestudiedinamessyroomandsomeinaneatspace.Onegroupofstudentsspentbothsessionsinthesameroomwhiletheothersplitthesessionsbetweenthetwoenvironments.Duringatestthestudentswhostudiedinmultipleplacesrememberedmuchmore.2Thatincludesthetimeofdaythemusicinthebackgroundwhetheryousitorstandetc. ToRememberYourPIN TechniqueCountitout Youcoulduseyourbirthdayoryourphonenumberbutidentitythieveshaveawayoffiguringthosenumbersout.3Writeafour—wordsentencethencountthenumberoflettersineachword.ForinstanceThisismyPIN＝4223. ToRememberFaces TechniqueFocusonnoses Whilesomesupermemorizersspecializeinassociatingnameswithfacesthememory—palacetechniquedoesn'tworkaswelliftheimageofthefaceischangedinanyway.Ratherthanfocusingoneyesasmostpeopledofocusonthecentreortotheleftofapersonsnose.4 ToRememberFacts&figures Technique5 Tolearnandrememberstatisticsreviewingthematerialrepeatedlyoveralongertimeisfarmoreeffectivethanrepeatingitinashorterone.Ifyourexamisinaweekstudytodayandthenagaininadayortwo.Ifitsamonthawaystudytodayandthenwaitaweekbeforeyoursecondsession. A.Valueexams. B.Giveyourselftime. C.Thisallowsyoutotakeintheirwholeface. D.Theirbrainstructuresareinfactthesameastherestofours. E.InsteadtrythistipfromDominicaneight—timeWorldMemoryChampion. F.Thetheoryisthatyourbrainlinksthewordstotheenvironmentaroundyou. G.Studiesshowedthatvaryingotheraspectsofyourenvironmentcanalsohelp.
QianZhongshuwasaChinesescholarandwriterknownforhiswitanderudition博学.DespitefailinginmathematicsQian1successenteredtheDepartmentofForeignLanguagesunderTsinghuaUniversityin1929becauseofhis2excellenceperformanceinChineseandEnglishlanguages.InTsinghuahemethiswifeYangJiangwhowastobecomeasuccessfulplaywrightandtranslatorand3marryherin1935.InthesameyearQianreceivedgovernmentsponsorship4promotehisstudiesabroad.TogetherwithhiswifeQianheadedfortheUniversityofOxfordinBritain.After5spendtwoyearsatExeterCollegehereceivedabachelorofliterature.HestudiedforonemoreyearintheUniversityofParisinFranceandhedidn'treturntoChina61938. QianlivedinShanghaifrom1941to19457wasthenunderJapaneseoccupation.Atthattimehedevoted8hetowritingandmanyofhisworkswerewrittenorpublishedthen.Acollectionofshort9essayWritingintheMarginsofLifewaspublishedin1941.HismostcelebratedworkFortressBesiegedappearedin1947.OntheArtofPoetrywritten10classicalChinesewasissuedin1948.
下列说法中正确的是
一列横波沿x轴正方向传播在t＝0时刻的波形曲线如图所示．已知这列波的质点P从t＝0时刻起第一次达到波峰的时间为0.6s质点PQ的坐标分别为10和70则有
Chinesehigh—speedrailwayareavery1comfortwaytotravel.Theyarecleanquietandefficient.Chinahasledotherdevelopingcountriesandevensomedevelopedonesinthisfieldsincethefirsthigh—speedtrain2comeintousein2008. Thestationsare3mainbuiltoutsidethetowncentrebutlocaltransporthasbeenlengthened4connectthehigh—speednetwork.Thefacilitiesonthetrainarenewandthestaffarewelltrained.Eventhesecondclass5chairprovideplentyofspace.Thepassengersaresowide6youcanmovewithoutdisturbinganyone.Youcanuseyourmobilephoneaccess7Internetorworkonyourlaptop.Thereisalsoarestaurantcarthoughthekindsoffood8belimited.Thetoiletsarelargecleananduser—friendlytoo.Thetrainalmostdoesntrock.Evenwhenthetrainbrakesyoucanhardlyfeelitshake. What'smorewithafastercheck—inthehigh—speedtrainsarealso9littleaffectedbyweatherthanplanes.Seldomare10delayedorcancelledforweathercondition.Thereforetheyhavebecomethefirstchoiceformanypassengers.
Knowingwhattodoatcheckoutandproperlypreparingforitcanturnapotentiallyheatedsituationintoaquickthankyouaddgoodbye.Belowwemadealistoffivethingsyoushouldrememberathotelcheckout. Don'tbelatetocheck Hotelsmayaddanextremelyhighpriceforbeingjustahalfhourlate.Ifyouknowyouwon'tmakethecutofftimeitneverhurtstocallaheadandtrytonegotiateawayapotentialcharge. Don'tforgettodoublecheektheroomandsafe Makesureyoudon'tleavethingsbehind.Ifyouhaveanearlyflightorcheckouttimepackupasmuchasyoucanthenightbeforesothatlast—minuterushisn'ttooannoying.Alsobesuretotakeoutanythingintheroomsafe. Don'tforgettotipthehousekeepers It'salwayspolitetoleavesomemoneyforthepeoplekeepingyourroomclean. Don'tignorethedetailedbill Youmaybeinarushbutgivethedetailedhillacarefullooktoseeifthehotelchargeisdifferentfromtherateyouinitiallybooked. Don'tgetangry Shootingattheassistantmanagerstandingbehindthefrontdeskprobablywon'thelp. Whendealingwithanunexpecteditemonthebill.Thinkabouthowdifficultitcanbetodealwithannoyedcustomers.Keepcalmandthingsmaybesolvedbetterandsooner. 1Thehotelwillchargeyoumoremoneyifyou. A.checkbeforecutofftime B.donotcallthehotelahead C.arelateincheckingout D.negotiatewiththeclerks 2Whichofthefollowingdoestheauthorsuggestdoing? A.Leavingsomethingbehind. B.Beingsuretokeeptheroomclean. C.Doingthepack—upasearlyaspossible. D.Tippingthehousekeeperstoshitrespect. 3Whatisthepurposeofthelastparagraphofthepassage? A.Tosuggestawaytosolveproblemsproperly B.Toprovidemoreinformationaboutthehotel. C.Toshowtheuneasinessofassistantmanagers D.Toprotectcustomersfromunnecessarydangers. 4Inwhichsectionofthemagazinecanyouprobablyfindsuchapassage? A.Fitness. B.Nature. C.Lifestyle. D.Travel.
Itisgenerallyacknowledgedthatyoungpeoplefrompoorersocio—economicbackgroundstendtodolesswellintheeducationsystem.InanattempttohelpthechildrenofpoorfamiliesanationwideprogramcalledHeadstartwasstartedintheUSin1965.Alotofmoneywaspouredintoit.Ittookchildrenintopre—schoolinstitutionsattheageofthreeandwassupposedtohelpthemsucceedinschool.Buttheresultshavebeendisappointingbecausetheprogrambegantoolate.Manychildrenwhoentereditatthreewerealreadybehindtheirpeersinlanguageandintelligenceandtheparentswerenotinvolvedintheprocess.AttheendofeachdayHeadstartchildrenreturnedtothesamedisadvantagedhomeenvironment. ToimprovetheresultsanotherprogramwasstartedinMissourithatconcentratedonparentsasthechild'sfirstteachers.Thisprogramwasbasedonresearchshowingthatworkingwiththefamilyisthemosteffectivewayofhelpingchildrengetthebestpossiblestartinlife.Thefour—yearstudyincluded380familieswhowereabouttohavetheirfirstchildandrepresenteddifferentsocial—economicstatusageandfamilystructure.Theprograminvolvedtrainededucatorsvisitingandworkingwiththeparentorparentsandthechild.Theprogramalsogavetheparentssomeguidanceandusefulskillsonchilddevelopment. AtthreethechildreninvolvedintheMissouriprogramwereevaluatedwiththechildrenselectedfromthesamesocio—economicbackgroundandfamilysituations.Theresultswereobvious.Thechildrenintheprogramweremoreadvancedinlanguagedevelopmentproblemsolvingandotherintellectualskillsthantheirpeers.Theyperformedequallywellregardlessofsocio—economicbackgroundsorfamilystructure.Theonefactorthatwasfoundtoaffectthechild'sdevelopmentwasthepoorqualityofparent—childinteraction.Thatinteractionwasnotnecessarilybadinpoorerfamilies. TheMissouriprogramcomparesquitedistinctlywiththeHeadstartprogram.Withoutasimilarfocusonparenteducationandonthevitalimportanceofthefirstthreeyearssomeevidenceindicatesthatitwillnotbeenoughtoovercomeeducationalunfairness. 1WhatcausedthefailureoftheHeadstartprogram? A.Thelargenumberofpoorfamilies. B.Thedisapprovalfromchildren. C.Thelatestartoftheprogram. D.Thelongperiodoftime. 2WhatdoweknowabouttheMissouriprogram? A.Itfocusedonthechildren'sfirstschoolteachers. B.Ithelpedthechildrenreturntothesamehome. C.Itmadethechildrenimprovedinmanyaspects. D.Itgavetheparentsadviceontheirdevelopment. 3Accordingtothepassagewhatislikelytoinfluencechildren'sperformance? A.Thenumberoffamilymembers. B.Theparent—childcommunication. C.Theintelligenceoftheirparents. D.Theteacher—studentrelationship. 4Howdoestheauthordevelopthepassage? A.Bylistingfigures. B.Bymakingcomparisons. C.Bygivingexamples. D.Bydrawingconclusions.
质量m＝1.0kg的物块A可视为支点轻弹簧的上端连接弹簧下端固定在光滑斜面底端斜面的倾斜角θ＝30°．平衡时弹簧的压缩量为x＝0.20m此时具有的弹性势能Ep＝0.50J物块A处在O时弹簧为原长如图所示．一质量m＝1.0kg物块B可视为质点从距离物块A为d＝2.0m处从静止开始沿斜面下滑与物体A发生碰撞后立刻一起向下运动但不粘连它们到达最低点后又向上运动．g＝10m/s2求 1物块B与物体A碰撞后的速度 2物块B向上运动到达的最高点与O的距离s．
Ahumpbackwhaleisstrugglinghardinthesea.Thehumpbackscanweigh40tonsandstretch50feelfromnosetotail.That'sthekindof1andsizethateasilyoverturnsmallboats.Tojumpontothe2ofoneofthesegiantsis3toresultinadisaster.Butthat'sjustwhatSamSynsleliendidwhenhesawahumpback4caughtinaropethatwas5toabuoy浮标inCentralCaliforniansMorroBaythisweek. SamalongwithcrewmateNicholasTaronhadalreadytried6theunfortunatewhaletotheU.S.CoastGuard一buttheyweretolditwouldbehoursbefore7couldbesent.8thecommercialfishermen9thiswhaledidn'thave.Ifthewhalewasto10theyhadtogogetit.Therewasnoother11forthewhale.Theydecidedtogoforittotally12thefear.Turon's13intherescuewasmostlyinthe14cheeringdepartment.Intheclipyoucanhearhimdirectingtheoperationfromthesideoftheboatwhilefilmingtheentire15. Swim!Swim!HeyellsMove!Justgetit!Getit! Theanxiouswhalewasjustswimmingincounter﹣clockwisecircles16andbeingheldtothebottom.Itthrewitsheavytailagainsttheboat.ButSam17itandjumpedontothewhale'sbacktosaveitslife.Hemanagedtohanginthere18cuttingthroughtheropethat19thecreature.Andthenwithawhoosh击水声itdovedeepdownbeneaththegreat20.Itwasn'tmuchofathankyoubutSynstelienandTaronwereleftwithawhaleofatale. 1A.length B.violence C.ability D.weight 2A.nose B.head C.back D.tail 3A.willing B.likely C.anxious D.flexible 4A.hopelessly B.loosely C.curiously D.secretly 5A.stuck B.directed C.adjusted D.attached 6A.shipping B.delivering C.reporting D.hunting 7A.boats B.rescuers C.fishermen D.experts 8A.Strength B.Advantages C.Patience D.Hours 9A.figured B.objected C.hesitated D.proved 10A.paddle B.survive C.relax D.breathe 11A.barrier B.accommodation C.option D.equipment 12A.hiding B.exhibiting C.fostering D.ignoring 13A.interest B.ambition C.role D.contribution 14A.disturbing B.enthusiastic C.clumsy D.scared 15A.operation B.creature C.performance D.fighting 16A.silent B.stressed C.confused D.unconscious 17A.wrestled B.spotted C.trained D.approached 18A.eventually B.naturally C.directly D.normally 19A.prohibited B.injured C.tied D.monitored 20A.waves B.noises C.ferry D.darkness
Unitthe1980sscientistsweretrainedtoignoreanimalpainaccordingtothebeliefthattheabilitytofeelpainwasassociatedonlywithhigherconsciousness.Howevertodayscientistsviewhumansasaspeciesofanimalsandlargelyacceptthatmanyspeciesarecapableofsomelevelofself﹣awareness.1 Ifyouhitanotherpersoninthefaceyoucanestimatetheirpainlevelbywhattheydoorsayinresponse.2Graduallyscientistshavedevelopedasetofindicatorsofpainresponseinnon﹣humananimals.Demonstratingaresponsetoanegativestimulationanddisplayingprotectivebehaviorofinjuredareasaretwomajorsigns. 3Someresearchersarguelobsters龙虾aretoodissimilartovertebrates脊椎动物tofeelpain.Nonethelesslobstersdosatisfyallofthestandardsforapainresponse.Lobstersguardtheirinjuriesandlearntoavoiddangeroussituations.Theyareevenbelievedtopossesssomelevelofconsciousness.Inresulttodaymostscientistsagreethatinjuringalobstercausesphysicalpain. Duetogrowingevidencethatthelobstersmayfeelpainitisnowillegaltoboillobstersaliveorkeepthemoniceinsomecountries.Eveninlocationswhereboilinglobstersremainslegalmanyrestaurantsprefermorehumanemethods.4Tosatisfypickydinersmorerestaurantsruleoutthecruelcookingmethods. CurrentlythemosthumanetoolforcookingalobsteristheCrustaStun.Thisdeviceelectrocutes电击alobster.5Thefollowingprocessofcookingissuretocausenopain.Incontrastittakesabout2minutesforalobstertodiefromboilingwaterduringwhichtimepainlasts. A.Buthugedisagreementexists. B.Thecreatureinstantlylosesconsciousnessinhalfasecond. C.Itbeatstheformermethodbysavingchefs'effortincleaningthecreature. D.It'sdifficulttoassesspaininotherspeciesbecausewecannotcommunicateaseasily. E.Peoplearecomingtorealizethatotherspeciesmightalsoenjoytheluxuryofemotion. F.Exceptformoralconsiderationmanychefsbelievestressnegativelyaffectstheflavor味道ofthemeat. G.Legalprohibitionbecomesthemajorconsiderationforrestaurantswhenchoosingacookingmethod.
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