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如图,已知,∠ACB=90°,CD⊥AB于点D,那么图中与∠A相等的角是
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<∠
,CM是斜边AB上的中线,将△ACM沿直线CM折叠,点A.落在点D.处,如果CD恰好与AB垂直,那么∠A.的度数是( )
A. 30°B. 40°
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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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