Many theories concerning the causes of juvenile delinquency (crimes committed by young people) focus either on the individual or on society as the major contributing influence. Theories (51) on the individual suggest that children engage in criminal behavior (52) they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through (53) with others. Theories focusing on the role of society suggest that children commit crimes in response to their failure to rise above their socioeconomic status, (54) as a rejection of middle-class values. Most theories of juvenile delinquency have focused on children from disadvantaged families, ignoring the fact that children from wealthy homes also commit crimes. The latter may commit crimes (55) lack of adequate parental control. All theories, however, are tentative and are (56) to criticism. Changes in the social structure may indirectly (57) juvenile crime rates. For example, changes in the economy that lead to fewer job opportunities for youth and rising unemployment (58) make gainful employment increasingly difficult to obtain. The resulting discontent may in turn lead more youths into criminal behavior. Families have also (59) changes these years. More families consist of one-parent households or two working parents; consequently, children are likely to have less supervision at home (60) was common in the traditional family structure. This lack of parental supervision is thought to be an influence on juvenile crime rates.

56().

A.immune 

B.resistant 

C.sensitive 

D.subject

党的十八大提出的“建设美丽中国”目标。某校高一年学生组织了以“建设美丽城市，你我共参与”为主题的研究性学习活动。以下是同学们在活动中收集到的资料。

市委、市政府日前研究决定，今年将继续为民办50件实事，着力保障和改善民生，切实解决人民群众最关心、最现实的热、难点问题。50件实事涉及就业、就学、社保和医、食、住、行等各方面，计划完成投资超80亿元。

【惠民亮点】:提高城乡居民医疗保险政府补助标准；推动该市医保全省同城结算；扩建新轮渡码头及配套工程；加快建设该市火车北站快速通道工程；提高适龄幼儿就读公办幼儿园比例。

【建设美丽城市】：继续修建完善步行系统；加快运动训练、锻炼健身场所建设；配套建设一批青少年校外体育活动中心；进一步推进“四绿”工程建设；实施海域清淤；继续实施湖泊综合治理工程；继续推进海湾水面治理工作；继续开展一批溪流流域综合治理工程；继续加大日常垃圾处理能力，完善东部固废中心及配套道路。

（1）请从我国国家性质的角度分析该市政府着力保障和改善民生的必要性。（6分）

（2）请运用公民政治参与的相关知识,为该市市民宣传、实践、推动美丽城市建设提出三条合理化建议。（6分）