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已知:如图,Rt△TNM中,∠TMN=90°,MR⊥TN于R点,TN=4,MN=3, 求:sin∠TMR、cos∠TMR、tan∠TMR
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画出图中杠杆上的力F1F2的力臂L1L2
IntheeighteenthcenturyoneofthefirstmoderneconomistsAdamSmiththoughtthatthewholeannualproduceofthelandandlabourofeverycountryprovidedrevenuetothreedifferentordersofpeoplethosewholivebyrentthosewholivebywagesandthosewholivebyprofit.Eachsuccessivestageoftheindustrialrevolutionhowevermadethesocialstructuremorecomplicated. Manyintermediategroupsgrewupduringthenineteenthcenturybetweentheuppermiddleclassandtheworkingclass.Thereweresmall﹣scaleindustrialistsaswellaslargeonessmallshopkeepersandtradesmenofficialsandsalariedemployeesskilledandunskilledworkersandprofessionalmensuchasdoctorsandteachers.Farmersandpeasantscontinuedinallcountriesasindependentgroups. Duringthenineteenthandearlytwentiethcenturiesthepossessionofwealthinevitablyaffectedaperson'ssocialposition.Intelligentindustrialistswithinitiativemadefortunesbytheirwitswhichliftedthemintoaneconomicgroupfarhigherthanthatoftheirworking﹣classparents.Buttheylackedsocialtrainingoftheupperclasswhodespisedthemasthenewrich. Theyoftensenttheirsonsanddaughterstospecialschoolstoacquiresocialtraining.Heretheirchildrenmixedwiththechildrenoftheupperclasseswereacceptedbythemandveryoftenfoundmarriagepartnersfromamongthem.Inthesamewayathriftyhardworkinglabourerthoughnotcleverhimselfmightsaveforhissonenoughtopayforanextendedsecondaryschooleducationinthehopethathewouldmoveinawhite﹣collaroccupationcarryingwithitahighersalaryandamoveupinthesocialscale. Inthetwentiethcenturytheincreasedtaxationofhigherincomesthegrowthofthesocialservicesandthewiderdevelopmentofeducationalopportunityhaveconsiderablyalteredthesocialoutlook.Theupperclassesnolongerarethesoleoreventhemainpossessorsofwealthpowerandeducationthoughinheritedsocialpositionstillcarriesconsiderableprestige. 21.WhatcriteriondidAdamSmithseemtogobyinhisclassificationofsocialgroups? A.Theamountofwealth B.Theamountofmoney C.Thesocialstatus D.Thewayofgettingmoney 22.IfyoucomparethefirstandsecondparagraphwhatgroupsofpeopledidAdamSmithleaveoutinhisclassification? A.Officialsandemployees. B.Peasantsandfarmers. C.Doctorsandteachers. D.Tradesmenandlandlords. 23.Whowerethe'newrich'duringthenineteenthandearlytwentiethcenturies? A.Theywerestilltheupperclasspeople. B.Theywereownersoflargefactories. C.Theywereintelligentindustrialists. D.Theywereskilledworkerswhomadetheirfortune. 24.Accordingtothepassagewhatdidthosepeopledowhointendedtomaketheirchildrenmoveupinthesocialladder? A.Theysavedalotofmoneyfortheirchildrentoreceivehighereducation. B.Theytriedtofindmarriagepartnersfromthechildrenoftheupperclass. C.Theymadegreaterfortunesbytheirwits. D.Theyworkedevenhardertoacquiresocialtraining. 25.Inthetwentiethcenturyclassdifferenceshavebeenpartlysmoothedoutby. A.increasedincomeanddecreasedtaxation B.taxationsocialservicesandeducationalopportunities C.educationtheincreaseofincomeandindustrialdevelopment D.thedecreaseoftheupperclasspopulation.
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IwasveryfondofhuntingwhenIwasayoungman.Intheautumnof1915Iwas30inthenorthwestofIndia.Oneeveningafterhuntingintheforestall31IwasreturningalonetotheplacewhereIhad32upmytent.Iwastired33hungry.Itwasgetting34anddarkerandIwaswalkingslowly35anarrowpath.Onmyrightwasawideriveronmylefta36darkforest.Allofa37Isawtwogreeneyeslookingatmefromamongthetrees.Iknewit38beaman﹣eatingtiger.Thetigerwasgettingreadyto39onme. Myheart40.WhatcouldIdo?ShouldIjump41theriverandhopetosavemylife42swimming?Ilookedtothe43.Intherivertherewasa44crocodilewaitingtowelcomemewithitsmouth45open.Iwasso46thatIshutmyeyes.AndIthoughtitwouldbetheendofmy47.Iheardbranchesmoving48thetigerroared咆哮andjumped.49thenIopenedmyeyes.Whatdoyouthinkhadhappened?Thetigerhadjumpedrightovermeandnowinthejaws嘴ofthecrocodile. 30.A.practicing B.studying C.planting D.travelling 31.A.day B.night C.thetime D.theyear 32.A.turned B.put C.made D.brought 33.A.but B.and C.or D.nor 34.A.colder B.warmer C.brighter D.cooler 35.A.by B.beside C.along D.on 36.A.thick B.strong C.tall D.short 37.A.shock B.joy C.sudden D.surprise 38.A.could B.can C.must D.should 39.A.live B.depend C.look D.jump 40.A.beat B.sank C.ached D.jumped 41.A.across B.over C.into D.from 42.A.on B.of C.with D.by 43.A.front B.back C.left D.right 44.A.big B.tiny C.dead D.dying 45.A.long B.short C.wide D.narrow 46.A.tired B.excited C.frightened D.surprised 47.A.work B.study C.day D.life 48.A.though B.as C.but D.or 49.A.Just B.Even C.Still D.Only
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