Many theories concerning the causes of j

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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  1 on the individual suggest that children engage in criminal behavior  2 they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through  3 with others. Theories focusing on the role of society suggest that children commit crimes in  4 to their failure to rise above their socioeconomic status  5 as a rejection of middle-class values.  Most theories of juvenile delinquency have focused on children from disadvantaged families,  6 the fact that children from wealthy homes also commit crimes. The latter may commit crimes  7 lack of adequate parental control. All theories, however, are tentative and are  8 to criticism.  Changes in the social structure may indirectly  9 juvenile crime rates. For example, changes in the economy that  10 to fewer job opportunities for youth and rising unemployment  11 make gainful employment increasingly difficult to obtain. The resulting discontent may in  12 lead more youths into criminal behavior.  Families have also  13 changes these years. More families consist of one-parent households or two working parents;  14 , children are likely to have less supervision at home  15 was common in the traditional family  16 . This lack of parental supervision is thought to be an influence on juvenile crime rates. Other  17 causes of offensive acts include frustration or failure in school, the increased  18 of drugs and alcohol, and the growing  19 of child abuse and child neglect. All these conditions tend to increase the probability of a child committing a criminal act,  20  a direct causal relationship has not yet been established.

选项 2.______ A.before B.unless C.until D.because

答案D

解析之前他们犯的错误没有受到足够的处罚等是青少年犯罪的原因,两者为因果关系,因此选because表示…的原因。until和before表示时间,unless表示条件。
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