Many theories concerning the causes of juvenile delinquency (crimes committed by young people) focus either on the individual or

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问题     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【C1】______on the individual suggest that children engage in criminal behavior【C2】______they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through【C3】______with others. Theories focusing on the role of society suggest that children commit crimes in【C4】______to their failure to rise above their socioeconomic status,【C5】______as a rejection of middle-class values.
    Most theories of juvenile delinquency have focused on children from disadvantaged families,【C6】______the fact that children from wealthy homes also commit crimes. The latter may commit crimes【C7】______lack of adequate parental control. All theories, however, are tentative and are【C8】______to criticism.
    Changes in the social structure may indirectly【C9】______juvenile crime rates. For example, changes in the economy that【C10】______to fewer job opportunities for youth and rising unemployment【C11】______make gainful employment increasingly difficult to obtain. The resulting discontent may in【C12】______lead more youths into criminal behavior.
    Families have also【C13】______changes these years. More families consist of one-parent households or two working parents;【C14】______, children are likely to have less supervision at home【C15】______was common in the traditional family【C16】______. This lack of parental supervision is thought to be an influence on juvenile crime rates. Other【C17】______causes of offensive acts include frustration or failure in school, the increased【C18】______of drugs and alcohol, and the growing【C19】______of child abuse and child neglect. All these conditions tend to increase the probability of a child committing a criminal act,【C20】______a direct causal relationship has not yet been established.
【C11】

选项 A、in general
B、on average
C、by contrast
D、at length

答案A

解析 考查介词短语辨析。此句意为:经济变革使回报丰厚的工作越来越难以获得。对于此题,可以将四个选项语义代入进行筛选。选项A.in general“一般来说”,符合句子含义,即:一般来说,经济变革使回报丰厚的工作越来越难以获得。on average“平均”;by contrast“对比”;at length“最终”,均不符合句子含义。
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